35,670 results
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2. Recent Research Progress of Paper‐Based Supercapacitors Based on Cellulose.
- Author
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Xiong, Chuanyin, Wang, Tianxu, Han, Jing, Zhang, Zhao, and Ni, Yonghao
- Subjects
SUPERCAPACITORS ,CELLULOSE ,ENERGY storage ,CLEAN energy ,SUSTAINABLE development - Abstract
In recent years, paper‐based functional materials have received extensive attention in the field of energy storage due to their advantages of rich and adjustable porous network structure and good flexibility. As an important energy storage device, paper‐based supercapacitors have important application prospects in many fields and have also received extensive attention from researchers in recent years. At present, researchers have modified and regulated paper‐based materials by different means such as structural design and material composition to enhance their electrochemical storage capacity. The development of paper‐based supercapacitors provides an important direction for the development of green and sustainable energy. Therefore, it is of great significance to summarize the relevant work of paper‐based supercapacitors for their rapid development and application. In this review, the recent research progress of paper‐based supercapacitors based on cellulose was summarized in terms of various cellulose‐based composites, preparation skills, and electrochemical performance. Finally, some opinions on the problems in the development of this field and the future development trend were proposed. It is hoped that this review can provide valuable references and ideas for the rapid development of paper‐based energy storage devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Ultrahigh‐Rate On‐Paper PEDOT:PSS‐Ti2C Microsupercapacitors with Large Areal Capacitance.
- Author
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Xue, Han, Huang, Po‐Han, Göthelid, Mats, Strömberg, Axel, Niklaus, Frank, and Li, Jiantong
- Subjects
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POWER resources , *WEARABLE technology , *ENERGY storage , *POWER density , *ELECTRIC capacity , *SUPERCAPACITOR electrodes , *SUPERCAPACITORS - Abstract
The growing demands of sustainable, portable, and wearable electronics pose new demands on miniaturized energy storage devices that can be integrated on flexible substrates such as paper. Microsupercapacitors (MSCs), especially MXene‐based pseudocapacitive MSCs with fast charging/discharging rate, high power density, and long cycle life, are competitive candidates as power supply for emerging flexible and wearable on‐paper electronics. However, few studies have reported MXene‐based on‐paper MSCs to simultaneously attain ultrahigh‐rate (>1000 mV s−1) capability and large areal capacitance >10 mF cm−2. Herein, ultrafast metal‐free on‐paper MSCs are fabricated through leveraging the synergistic effect of conductive PEDOT:PSS and capacitive MXene (Ti2C) to achieve a remarkable areal capacitance of 30 mF cm−2 and long lifetime (>96% capacitance retention after 10 000 cycles) at an ultrahigh scan rate of 1000 mV s−1, outperforming most of the present on‐paper or MXene‐containing MSCs. Moreover, the printed on‐paper metal‐free MSC arrays attain extended working voltage window of up to 6 V and outstanding capacitive performance at an ultrahigh scan rate of 10 V s−1. The on‐paper PEDOT:PSS‐Ti2C composite MSCs offer new opportunities as eco‐friendly microscale power sources for emerging paper‐based portable and wearable electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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4. Pseudocapacitive Electrode Based on MnO2 Loaded Activated Charcoal on Graphite Paper for Sustainable Energy Storage.
- Author
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Ivan Jebakumar, D. S., Jeyakumar, U., and Dinesh Raja, N.
- Subjects
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CLEAN energy , *ELECTRODE performance , *ENERGY density , *ENERGY storage , *ACTIVATED carbon - Abstract
The design of high‐performance electrode material without compromising energy and power density is critical for the advancement in hybrid electric vehicle technology. In this perspective, we have fabricated a MnO2 loaded activated charcoal‐based electrode on graphite paper as an endeavour to improve the energy storage capabilities. The electrode material is synthesized by employing a sustainable route and the structural, microstructural, and textural properties have been investigated. The electrochemical performance for energy storage is evaluated and the fabricated electrode on graphite paper exhibits remarkably high‐power density (811 W kg−1) maintaining high energy density (106 Wh kg−1) at the same time, along with high gravimetric specific capacitance value of 768 F g−1 at 2 mA cm−2. The obtained results demonstrate the excellent performance of the electrode material, suggesting MnO2 loaded activated charcoal as a prospective electrode material to meet the demand of hybrid electric vehicles as well as to contribute to our transitioning towards low‐to‐zero carbon emission technology. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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5. Optimizing Energy Storage Performance: In situ Synthesized Manganese Oxide (Mn3O4) Nanoparticle‐Based Symmetric Supercapacitor on a Paper Substrate.
- Author
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Ghosh, Sarit K., Kumari, Pooja, Saha, Chandan, Singh, Harishchandra, Waziri, Ibrahim, Mbileni‐Morema, Charity N., and Mallick, Kaushik
- Subjects
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POTENTIAL energy , *ENERGY storage , *ENERGY density , *POTASSIUM permanganate , *POWER density , *SUPERCAPACITORS - Abstract
In this study, a redox reaction is employed to synthesize manganese oxide (Mn3O4) nanoparticles using potassium permanganate as a precursor in the presence of diethyl amine. The structural characterization reveals the formation of the tetragonal phase of Mn3O4 nanoparticles with a space group of I41/amd. A free‐standing Mn3O4‐based paper electrode is fabricated and its electrochemical performances are investigated. The electrode exhibits a maximum specific capacitance value of ~353 F g−1 and an areal capacitance of ~530 mF cm−2 at a current density of 0.2 A g−1. A symmetric supercapacitor‐based device is also designed using Mn3O4 nanoparticles as an active material in a gel electrolyte configuration. The Mn3O4 device achieves specific and areal capacity values of ~208 mAh g−1 and 260 mA cm−2, respectively, at a current density of 0.3 A g−1. The device delivers maximum energy and power density values of ~104 Wh kg−1 and ~220 W kg−1, respectively, with ~92 % specific capacity retention at 0.3 A g−1 after 5000 cycles. The above results suggest that the Mn3O4‐based device has the potential for energy storage applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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6. Bilayered nanostructured V2O5 nH2O xerogel constructed 2D nano-papers for efficient aqueous zinc/magnesium ion storage.
- Author
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He, Qingqing, Wang, Huayu, Bai, Jie, Liao, Yanxin, Wang, Suna, and Chen, Lingyun
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MAGNESIUM ions , *DIFFUSION kinetics , *ZINC ions , *ENERGY storage , *ALTERNATIVE fuels , *ELECTROSTATIC interaction , *ELECTRIC batteries - Abstract
[Display omitted] • Bilayered V 2 O 5 nH 2 O xerogel constructed 2D nanopapers were synthesized. • The V 2 O 5 nH 2 O Xerogel combines oxygen defect engineering. • Oxygen defect improves Zn2+/Mg2+ insertion/extraction kinetics. Aqueous zinc ion batteries (AZIBs) and aqueous magnesium ion batteries (AMIBs) offer powerful alternatives for large-scale energy storage because of their high safety and low cost. Consequently, the design of high-performance cathode materials is essential. In this paper, we present a simple strategy that combines oxygen defect (O d) engineering with a 2D-on-2D homogeneous nanopape-like bilayer V 2 O 5 nH 2 O xerogel (BL-HVO d NPS). This strategy employs O d to improve Zn2+/Mg2+insertion/extraction kinetics and reduce irreversible processes for high-performance AZIBs/AMIBs. And interlayer water molecules serve as an effective spacer to stabilize the expanded interlayer gap in BL-HVO d NPS, thereby providing extended diffusion channels for Zn2+/Mg2+ during insertion/extraction. The interlayer water molecules help shield the electrostatic interaction between Zn2+/Mg2+ and BL-HVO d NPS lattice, which improves diffusion kinetics during repeated. In addition, electrochemical characterization results indicate that the BL-HVO d NPS can effectively the surface adsorption and internal diffusion of Zn2+/Mg2+. More importantly, the successfully prepared unique 2D-on-2D homogenous nanopaper structure enhances electrolyte/electrode contact and reduces the migration/diffusion path of electrons/Zn2+ and Mg2+, thus greatly improving rate performance. As a result, the BL-HVO d NPS as AZIBs/AMIBs electrodes offer better reversible capacity of 361.8 and 162.8 mA h g−1 (at 0.2 A g−1), while displaying impressively long cycle lifes. This method provides a way to prepare advanced xerogel cathode materials for AZIBs and AMIBs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Paper-based laser-induced graphene for sustainable and flexible microsupercapacitor applications.
- Author
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Coelho, João, Correia, Ricardo F., Silvestre, Sara, Pinheiro, Tomás, Marques, Ana C., Correia, M. Rosário P., Pinto, Joana Vaz, Fortunato, Elvira, and Martins, Rodrigo
- Subjects
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GRAPHENE , *PAPER chromatography , *BORAX , *ENERGY storage , *VOLTAGE control - Abstract
Laser-induced graphene (LIG) is as a promising material for flexible microsupercapacitors (MSCs) due to its simple and cost-effective processing. However, LIG-MSC research and production has been centered on non-sustainable polymeric substrates, such as polyimide. In this work, it is presented a cost-effective, reproducible, and robust approach for the preparation of LIG structures via a one-step laser direct writing on chromatography paper. The developed strategy relies on soaking the paper in a 0.1 M sodium tetraborate solution (borax) prior to the laser processing. Borax acts as a fire-retardant agent, thus allowing the laser processing of sensitive substrates that other way would be easily destroyed under the high-energy beam. LIG on paper exhibiting low sheet resistance (30 Ω sq−1) and improved electrode/electrolyte interface was obtained by the proposed method. When used as microsupercapacitor electrodes, this laser-induced graphene resulted in specific capacitances of 4.6 mF cm−2 (0.015 mA cm−2). Furthermore, the devices exhibit excellent cycling stability (> 10,000 cycles at 0.5 mA cm−2) and good mechanical properties. By connecting the devices in series and parallel, it was also possible to control the voltage and energy delivered by the system. Thus, paper-based LIG-MSC can be used as energy storage devices for flexible, low-cost, and portable electronics. Additionally, due to their flexible design and architecture, they can be easily adapted to other circuits and applications with different power requirements. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. Preparation and characterization of colorful graphene oxide papers and flexible N‐doping graphene papers for supercapacitor and capacitive deionization
- Author
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Hao Zhang, Aiyang Li, Ying Yuan, Yuquan Wei, Di Zheng, Zhuning Geng, Haichuan Zhang, Guanghe Li, and Fang Zhang
- Subjects
colorful graphene oxide ,energy storage ,flexible graphene paper ,N‐doped graphene ,supercapacitor ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract An efficient method that utilizes simple techniques, easy operation, and low‐cost production to create flexible graphene‐based materials is a worthy practical challenge. A rapid strategy for preparing flexible, functional graphene oxide (GO) is introduced using GO‐ethanol dispersion filtration. The filtration process is highly efficient and drying time is significantly reduced by employing ethanol as solvent, due to the fact that ethanol is a volatile liquid. Freestanding GO papers can be harvested with ultralarge size (700 cm2), color variety, and writable characteristics. After reduction, N‐doped graphene (NDG) papers still maintain good foldability with improved electric conductivity and porous structure. When used as an electrode for a supercapacitor, the flexible NDG paper device demonstrates good electrochemical performance even with size expansion and extreme double folding. Moreover, this NDG paper capacitor device shows a good electrosorption performance for capacitive deionization of sulfate and chromate in groundwater system. These flexible GO and NDG papers promise potential to facilitate the production of graphene‐based materials for practical applications in energy and environmental related fields.
- Published
- 2020
- Full Text
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9. Ultrathin Paper Microsupercapacitors for Electronic Skin Applications.
- Author
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Say, Mehmet Girayhan, Sahalianov, Ihor, Brooke, Robert, Migliaccio, Ludovico, Głowacki, Eric D., Berggren, Magnus, Donahue, Mary J., and Engquist, Isak
- Subjects
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ELECTRONIC paper , *ELECTROCHROMIC devices , *FINITE element method , *ENERGY storage , *WEARABLE technology , *SUPERCAPACITOR electrodes - Abstract
Ultrathin devices are rapidly developing for skin‐compatible medical applications and wearable electronics. Powering skin‐interfaced electronics requires thin and lightweight energy storage devices, where solution‐processing enables scalable fabrication. To attain such devices, a sequential deposition is employed to achieve all spray‐coated symmetric microsupercapacitors (μSCs) on ultrathin parylene C substrates, where both electrode and gel electrolyte are based on the cheap and abundant biopolymer, cellulose. The optimized spraying procedure allows an overall device thickness of ≈11 µm to be obtained with a 40% active material volume fraction and a resulting volumetric capacitance of 7 F cm−3. Long‐term operation capability (90% of capacitance retention after 104 cycles) and mechanical robustness are achieved (1000 cycles, capacitance retention of 98%) under extreme bending (rolling) conditions. Finite element analysis is utilized to simulate stresses and strains in real‐sized μSCs under different bending conditions. Moreover, an organic electrochromic display is printed and powered with two serially connected μ‐SCs as an example of a wearable, skin‐integrated, fully organic electronic application. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
10. High‐rate metal‐free MXene microsupercapacitors on paper substrates.
- Author
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Xue, Han, Huang, Po‐Han, Lai, Lee‐Lun, Su, Yingchun, Strömberg, Axel, Cao, Gaolong, Fan, Yuzhu, Khartsev, Sergiy, Göthelid, Mats, Sun, Yan‐Ting, Weissenrieder, Jonas, Gylfason, Kristinn B., Niklaus, Frank, and Li, Jiantong
- Subjects
FEMTOSECOND lasers ,ENERGY storage ,ELECTRIC capacity ,ELECTRODES ,CARBON nanofibers - Abstract
MXene is a promising energy storage material for miniaturized microbatteries and microsupercapacitors (MSCs). Despite its superior electrochemical performance, only a few studies have reported MXene‐based ultrahigh‐rate (>1000 mV s−1) on‐paper MSCs, mainly due to the reduced electrical conductance of MXene films deposited on paper. Herein, ultrahigh‐rate metal‐free on‐paper MSCs based on heterogeneous MXene/poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS)‐stack electrodes are fabricated through the combination of direct ink writing and femtosecond laser scribing. With a footprint area of only 20 mm2, the on‐paper MSCs exhibit excellent high‐rate capacitive behavior with an areal capacitance of 5.7 mF cm−2 and long cycle life (>95% capacitance retention after 10,000 cycles) at a high scan rate of 1000 mV s−1, outperforming most of the present on‐paper MSCs. Furthermore, the heterogeneous MXene/PEDOT:PSS electrodes can interconnect individual MSCs into metal‐free on‐paper MSC arrays, which can also be simultaneously charged/discharged at 1000 mV s−1, showing scalable capacitive performance. The heterogeneous MXene/PEDOT:PSS stacks are a promising electrode structure for on‐paper MSCs to serve as ultrafast miniaturized energy storage components for emerging paper electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Vertically Layered Multi‐Pair Interdigital Electrodes within a Single Sheet of Paper for High Energy Density.
- Author
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Kim, Yeon Woo, Oh, In Hyeok, and Chang, Suk Tai
- Subjects
WEARABLE technology ,ELECTRODES ,ENERGY storage ,METAL foils - Abstract
A paper‐based supercapacitor (SC) is a promising flexible energy storage device for wearable electronics. Paper is an alternative flexible substrate to conventional substrates such as metal foil or plastics. Paper's porous structure can be applied as a large surface area of electrode to store more charge. Paper can also be used as a separator between each electrode. We propose a simple method for vertically integrating a multi‐pair of interdigital electrodes within only a single sheet of paper. The integrated multi‐electrodes were fully separated because of a removable wax barrier. The integrated multi‐pair interdigital electrodes in a paper were used as ultra‐thin SCs combined in parallel. With an inner space of paper, the device volume can be reduced with high energy density while preserving flexibility. The energy density was 86.58 μWh cm−2, which is three orders of magnitude higher energy density than a single SC at the same size. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
12. Conversion of laboratory paper waste into useful activated carbon: a potential supercapacitor material and a good adsorbent for organic pollutant and heavy metals
- Author
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Durairaj, Arulappan, Sakthivel, Thangavel, Ramanathan, Subramanian, Obadiah, Asir, and Vasanthkumar, Samuel
- Published
- 2019
- Full Text
- View/download PDF
13. Self-assembled high polypyrrole loading flexible paper-based electrodes for high-performance supercapacitors.
- Author
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Fan, Dezhe, Fang, Zhiqiang, Xiong, Zihang, Fu, Fangbao, Qiu, Shuoyang, and Yan, Mengzhen
- Subjects
- *
POLYPYRROLE , *SUPERCAPACITORS , *PORE size distribution , *HYDROGEN bonding interactions , *ENERGY density , *ENERGY storage - Abstract
The MXene-modified papers with high-uniform loading of polypyrrole and excellent conductivity have been fabricated via a multiple self-assembly and in-situ polymerization strategy, which achieves boosting areal capacitance. [Display omitted] • Multiple self-assembly and in-situ polymerization strategy is proposed tofabricate paper-based supercapacitors. • Alternate adsorption of MXene and polypyrrole on paper yields an ultra-high polypyrrole loading of 10.0 mg/cm2. • The paper-based supercapacitor shows a boosting areal capacitance of 2316 mF/cm2. Despite the intriguing features of freestanding flexible electronic devices, such as their binder-free nature and cost-effectiveness, the limited loading capacity of active material poses a challenge to achieving practical high-performance flexible electrodes. We propose a novel approach that integrates multiple self-assembly and in-situ polymerization techniques to fabricate a high-loading paper-based flexible electrode (MXene/Polypyrrole/Paper) with exceptional areal capacitance. The approach enables polypyrrole to form a porous conductive network structure on the surface of paper fiber through MXene grafting via hydrogen bonding and electrostatic interaction, resulting in an exceptionally high polypyrrole loading of 10.0 mg/cm2 and a conductivity of 2.03 S/cm. Moreover, MXene-modified polypyrrole paper exhibits a more homogeneous pore size distribution ranging from 5 to 50 μm and an increased specific surface area of 3.11 m2/g. Additionally, we have optimized in-situ polymerization cycles for paper-based supercapacitors, resulting in a remarkable areal capacitance of 2316 mF/cm2 (at 2 mA/cm2). The capacitance retention rate and conductivity rate maintain over 90 % after undergoing 100 bends.The maximum energy density and cycling stability are characterized to be 83.6 μWh/cm2 and up to 96 % retention after 10,000 cycles. These results significantly outperform those previously reported for paper-based counterparts. Overall, our work presents a facile and versatile strategy for assembling high-loading, paper-based flexible supercapacitors network architecture that can be employed in developing large-scale energy storage devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
14. Soy protein isolate/MXene decorated acidified carbon paper interlayer for long‐cycling Li–S batteries.
- Author
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Chen, Siying, Chen, Dongdong, Yang, Zhuohong, Liu, Ju, Lin, Jiamian, Xie, Zhuang, and Yang, Yu
- Subjects
LITHIUM sulfur batteries ,SOY proteins ,CARBON paper ,ADSORPTION (Chemistry) ,ENERGY storage - Abstract
The terrible shuttling of lithium polysulfides (LiPSs) is a major obstacle for commercializing lithium–sulfur (Li–S) batteries as high‐performance energy storage systems. In this study, a carbon‐based interlayer with effective suppression capability on the shuttle effect is developed by simply coating a well‐dispersed mixture of soybean protein isolate/MXene onto the acidified carbon paper (ACP). The resultant composite interlayer (SM@ACP) is able to synergistically diminish the shuttle effect through chemical adsorption and physical blocking. Meanwhile, this interlayer displays excellent conductivity and facilitates the diffusion of Li ions due to the composite coating to promote both electron/ion conduction as well as the porous structure of ACP. Benefiting from the unique properties of the composite interlayer, the as‐assembled Li–S batteries with SM@ACP interlayers show a great improvement in the cycling stability and rate performance, delivering a very low‐capacity decay rate of 0.071% per cycle at 0.5 C even after 800 cycles. This work provides a feasible route to realize rational design and commercial mass production of desirable interlayers for promoting the commercialization of Li–S batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
15. High-Performance Polypyrrole Coated Filter Paper Electrode for Flexible All-Solid-State Supercapacitor.
- Author
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Jiali Zhang, Qing Chen, Haixia Zhang, Ying Hou, and Junjie Guo
- Subjects
FILTER paper ,POLYPYRROLE ,ENERGY density ,ENERGY storage ,ELECTRODES ,SUPERCAPACITORS ,SUPERCAPACITOR electrodes ,SOLID state batteries - Abstract
A high-performance paper electrode is fabricated through coating polypyrrole (PPy) on ordinary laboratory filter paper via a traditional interfacial polymerization method with perchloric acid (HClO4) as a dopant. Owing to the superior mechanical flexibility and environmental stability of the free standing PPy paper, the robust electrode displays an ultrahigh capacitance of 1650 mF cm
−2 and remarkable cyclic stability of losing 11.66% after cycling for 10000 times in a three-electrode system. More importantly, the areal specific capacitance has only decreased by 0.08% after five months. Furthermore, by employing the synthesized PPy papers as electrodes and the PVA-H2 SO4 gel as electrolyte, the assembled all-solid-state supercapacitor with an areal specific capacitance of 566.5 mF cm−2 is achieved, corresponding to an areal energy density of 38.55 μW h cm−2 and power density of 0.17 mW cm−2 . These results suggest that the simple synthesis of PPy paper electrode pave a promising way to exploit flexible and durable energy storage applications. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
16. Nanotech Powers up Paper Battery: New Technology Would Offer Easy, Light Energy Storage
- Author
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Ehrenberg, Rachel
- Published
- 2010
17. Inkjet-printed flexible planar Zn-MnO2 battery on paper substrate.
- Author
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Sarma Choudhury, Sagnik, Katiyar, Nitish, Saha, Ranamay, and Bhattacharya, Shantanu
- Subjects
- *
ENERGY density , *ENERGY storage , *ELECTRONIC equipment , *NEGATIVE electrode , *POWER density , *INK-jet printers , *LITHIUM-ion batteries - Abstract
Energy storage devices (ESD) which are intended to power electronic devices, used in close contact of human skin, are desirable to be safe and non-toxic. In light of this requirement, Zn based energy storage devices seem to provide a viable pathway as they mostly employ aqueous based electrolytes which are safe and non-toxic in their functioning. Additionally, having a flexible ESD will play a crucial role as it will enable the ESD to conform to the varying shapes and sizes of wearable electronics which they energize. In this work, we have developed an inkjet-printed Zinc ion battery (IPZIB) with planar electrode configuration over bond paper substrate. Zn has been used as the negative electrode, MnO2 is used as the positive electrode with Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as the active binder. Conducting tracks of reduced graphene oxide (rGO) are used to construct the current collector on the paper substrate. The fabricated IPZIB delivered a high discharge capacity of 300.14 mAh g−1 at a current density of 200 mA g−1. The energy density of the IPZIB is observed as 330.15 Wh kg−1 at a power density of 220 W kg−1 and retains an energy density of 94.36 Wh kg−1 at a high power density of 1650 W kg−1. Finally, we have demonstrated the capability of the IPZIB to power a LED at various bending and folding conditions which indicates its potential to be used in the next generation flexible and wearable electronic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
18. Electrodes of carbonized MWCNT-cellulose paper for supercapacitor
- Author
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Sun, Xiaogang, Cai, Manyuan, Chen, Long, Qiu, Zhiwen, and Liu, Zhenghong
- Published
- 2017
- Full Text
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19. Enhanced Supercapacitor and Cycle-Life Performance: Self-Supported Nanohybrid Electrodes of Hydrothermally Grown MnO 2 Nanorods on Carbon Nanotubes in Neutral Electrolyte.
- Author
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Bouachma, Soraya, Zheng, Xiaoying, Moreno Zuria, Alonso, Kechouane, Mohamed, Gabouze, Noureddine, and Mohamedi, Mohamed
- Subjects
CLEAN energy ,SUPERCAPACITOR performance ,ENERGY storage ,CARBON paper ,CARBON nanotubes ,SUPERCAPACITORS ,SUPERCAPACITOR electrodes - Abstract
Efficient and sustainable energy storage remains a critical challenge in the advancement of energy technologies. This study presents the fabrication and electrochemical evaluation of a self-supporting electrode material composed of MnO
2 nanorods grown directly on a carbon paper and carbon nanotube (CNT) substrate using a hydrothermal method. The resulting CNT/MnO2 electrodes exhibit a unique structural architecture with a high surface area and a three-dimensional hierarchical arrangement, contributing to a substantial electrochemical surface area. Electrochemical testing reveals remarkable performance characteristics, including a specific capacitance of up to 316.5 F/g, which is 11 times greater than that of conventional CP/MnO2 electrodes. Moreover, the CNT/MnO2 electrodes demonstrate outstanding retention capacity, exhibiting a remarkable 165% increase over 10,000 cycles. Symmetric supercapacitor devices utilizing CNT/MnO2 electrodes maintain a large voltage window of 3 V and a specific capacitance as high as 200 F/g. These results underscore the potential of free-standing CNT/MnO2 electrodes to advance the development of high-performance supercapacitors, which can be crucial for efficient and sustainable energy storage solutions in various industrial and manufacturing applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
20. Waste paper-derived porous carbon via microwave-assisted activation for energy storage and water purification.
- Author
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Son, Josue Yaedalm, Choe, Seokwoo, Jang, Youn Jeong, and Kim, Hyejeong
- Subjects
- *
WATER purification , *WATER storage , *WASTE paper , *ENERGY storage , *ACTIVATION energy , *CARBONIZATION , *SOLID waste management , *GRAPHITIZATION , *DYES & dyeing - Abstract
The reuse of waste papers by conversion into valuable carbon materials has received considerable attention for diverse applications such as energy storage and water purification. However, traditional methods for converting waste papers into materials with suitable properties for specific applications are often complex and ineffective, involving consecutive carbonization and activation steps. Herein, we propose a simple one-step microwave (MW)-assisted synthesis for preparing waste paper-derived porous carbons (WPCs) for energy storage and water purification. Through a 30-min synthesis, WPCs with graphitic structure and high specific surface area were successfully produced. The fabricated WPCs exhibited outstanding charge storage capability with a maximum specific capacitance of 237.7 F g−1. Additionally, the WPC demonstrates a high removal efficiency for various dyes, achieving a maximum removal efficiency of 95.0% for methylene blue. The developed one-step MW synthesis not only enables the production of porous carbon from waste paper, but also offers a viable approach to address solid waste management challenges while simultaneously yielding valuable materials. [Display omitted] • Waste paper-derived porous carbons were synthesized by one-step microwave synthesis. • Within 30-min MW synthesis, graphitic and high-surface area WPCs were produced. • WPC exhibits outstanding electrochemical capacitance of 237.7 F g−1. • WPC exhibits high removal of various dyes, with maximum of 95.0% for methylene blue. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
21. Advantageous Functional Integration of Adsorption‐Intercalation‐Conversion Hybrid Mechanisms in 3D Flexible Nb2O5@Hard Carbon@MoS2@Soft Carbon Fiber Paper Anodes for Ultrafast and Super‐Stable Sodium Storage
- Author
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Deng, Qinglin, Chen, Feng, Liu, Si, Bayaguud, Aruuhan, Feng, Yuezhan, Zhang, Zhibo, Fu, Yanpeng, Yu, Yan, and Zhu, Changbao
- Subjects
- *
FUNCTIONAL integration , *CARBON paper , *CARBON fibers , *ENERGY storage , *SODIUM compounds , *LEAD titanate , *ANODES , *GRAPHITIZATION - Abstract
Using synergetic effects of various sodium storage modes and materials to construct high power, high energy, and long cycling flexible sodium anode materials is significant and still challenging. Here, by advantageous functional integration of adsorption‐intercalation‐conversion sodium storage mechanisms, a 3D flexible fiber paper anode with the composition of Nb2O5@hard carbon@MoS2@soft carbon is designed and prepared. Based on the synergetic effects, it exhibits higher specific capacity than pure Nb2O5, with more excellent rate performance (245, 201, 155, 133, and 97 mAh g−1 at the current density of 0.2, 1, 5, 10, and 20 A g−1, respectively) than pure MoS2 as well as admirable long‐term cycling characteristics (≈82% capacity retention after 20 000 cycles at 5 A g−1). Relevant kinetics mechanisms are expounded in detail. This work can be helpful for preparing other types of hybrid and flexible electrodes for energy storage systems. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
22. Mulberry-paper-based composites for flexible electronics and energy storage devices.
- Author
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Seo, Youngjae and Hwang, Byungil
- Subjects
FLEXIBLE electronics ,ENERGY storage ,MULBERRY ,SUPERCAPACITORS ,HOT pressing ,HYDROPHOBIC surfaces ,CHEMICAL stability - Abstract
Mulberry paper comprising holocellulose shows excellent mechanical and chemical stability suitable for paper-based electronics. However, most studies pertaining to paper-based electronics have used conventional paper. Therefore, in this study, we demonstrated Ag nanoparticle (AgNP)/Ag nanowire (AgNW) flexible composites on mulberry-paper substrates. The AgNP/AgNW composites were fabricated by the dry transfer method, where the AgNP/AgNW layers were transferred from a polymer substrate with a hydrophobic surface to the toner-printed mulberry paper via hot pressing. Microstructural analysis showed that the mulberry papers contained thicker fibres than those in conventional papers, which limited the uniform transfer of the AgNP/AgNW layers on the mulberry papers. Therefore, we optimised the hot pressing conditions to 30 MPa and 80 °C, which allowed for the successful formation of the AgNP/AgNW composites on mulberry papers. Cyclic bending test results over 10,000 cycles revealed that the mulberry-paper-based composites showed better mechanical reliability with 30–40% smaller increases in resistance compared to those in conventional A4-paper-based composites. Lastly, a flexible supercapacitor fabricated using the mulberry-paper-based composite as the current collector showed excellent reliability without significant capacitance degradation over 100 bending cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
23. Carbon layer-exfoliated, wettability-enhanced, SO3H-functionalized carbon paper: A superior positive electrode for vanadium redox flow battery.
- Author
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He, Zhangxing, Jiang, Yingqiao, Li, Yuehua, Zhu, Jing, Zhou, Huizhu, Meng, Wei, Wang, Ling, and Dai, Lei
- Subjects
- *
CARBON paper , *VANADIUM redox battery , *CHLOROSULFONIC acid , *ELECTRODE testing , *OXIDATION-reduction reaction - Abstract
In this paper, carbon paper as positive electrode for vanadium redox flow battery was etched by chlorosulfonic acid with assistance of ultrasonication. Carbon layer-exfoliated, wettability-enhanced, SO 3 H-functionalized carbon paper was successfully achieved by facile treatment. The electrochemical kinetics of VO 2+ /VO 2 + redox reaction on carbon paper was significantly improved after the treatment. Carbon paper after ultrasonication-assisted treatment exhibits better electrochemical activity compared with the untreated and only-soaking samples. The cell using treated carbon paper as positive electrode shows larger discharge capacity and higher energy efficiency compared with the pristine cell. The initial discharge capacity of the cell using optimal treated carbon paper reaches 127.7 mA h, 20.8 mA h larger than that of the pristine one at 50 mA cm −2 . Furthermore, the average energy efficiency increases by 5.1% by using the treated electrode. The introduced sulfonic groups as active sites and increased surface area by etching can reduce the electrochemical polarization of VO 2+ /VO 2 + redox reaction. Moreover, the improved wettability of treated carbon paper can accelerate mass transfer of active species. Therefore, the reduced electrochemical polarization and accelerated mass transfer of active species conjointly cause the enhanced electrochemical properties of the treated carbon paper. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
24. Preparation and characterization of colorful graphene oxide papers and flexible N‐doping graphene papers for supercapacitor and capacitive deionization.
- Author
-
Zhang, Hao, Li, Aiyang, Yuan, Ying, Wei, Yuquan, Zheng, Di, Geng, Zhuning, Zhang, Haichuan, Li, Guanghe, and Zhang, Fang
- Abstract
An efficient method that utilizes simple techniques, easy operation, and low‐cost production to create flexible graphene‐based materials is a worthy practical challenge. A rapid strategy for preparing flexible, functional graphene oxide (GO) is introduced using GO‐ethanol dispersion filtration. The filtration process is highly efficient and drying time is significantly reduced by employing ethanol as solvent, due to the fact that ethanol is a volatile liquid. Freestanding GO papers can be harvested with ultralarge size (700 cm2), color variety, and writable characteristics. After reduction, N‐doped graphene (NDG) papers still maintain good foldability with improved electric conductivity and porous structure. When used as an electrode for a supercapacitor, the flexible NDG paper device demonstrates good electrochemical performance even with size expansion and extreme double folding. Moreover, this NDG paper capacitor device shows a good electrosorption performance for capacitive deionization of sulfate and chromate in groundwater system. These flexible GO and NDG papers promise potential to facilitate the production of graphene‐based materials for practical applications in energy and environmental related fields. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
25. A flexible and conductive metallic paper-based current collector with energy storage capability in supercapacitor electrodes.
- Author
-
Li, Yaoyin, Wang, Qiyuan, Wang, Yong, Bai, Mingjun, Shao, Jian, Ji, Hongjun, Feng, Huanhuan, Zhang, Jiaheng, Ma, Xing, and Zhao, Weiwei
- Subjects
SUPERCAPACITORS ,ENERGY storage ,SUPERCAPACITOR electrodes ,OHMIC contacts ,ELECTRIC properties ,ELECTROLESS deposition ,FILTER paper ,WEARABLE technology - Abstract
The development of flexible current collectors as an indispensable component in energy storage devices has been in strong demand for the ever-growing market of flexible and wearable electronics. Herein, flexible and conductive paper-based current collectors are fabricated by directly depositing a metallic Ni layer composed of spiny Ni nanospheres of 400 nm diameter on the surface of filter paper via electroless deposition. The metallic paper shows excellent electric and mechanical properties: the sheet resistance is 2.7 Ω cm
−2 (R0 = 0.8 Ω cm−2 ) after 5000 bending cycles and the mass density is only 0.35 g cm−3 . MnO2 is selected as an electrode active material to explore the role of flexible and conductive paper-based current collectors in supercapacitors. Electrochemical results reveal that the largest areal specific capacitance is 1095 mF cm−2 at 1 mA cm−2 and the excellent electrochemical performance can be attributed to the hierarchical porous fibre structure of paper and the lower contact resistance between the active material and the current collector. Note that the approach can be applied to an enlarged size of metallic conductive paper or textile, presenting a simple and feasible method to fabricate flexible current collectors in a large scale. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
26. Nanodiamond‐Based Separators for Supercapacitors Realized on Paper Substrates.
- Author
-
Polino, Giuseppina, Scaramella, Alessandro, Manca, Valerio, Palmieri, Elena, Tamburri, Emanuela, Orlanducci, Silvia, and Brunetti, Francesca
- Subjects
SUPERCAPACITORS ,ELECTROLYTE solutions ,SUPERIONIC conductors ,ELECTRONIC paper ,ENERGY storage ,SODIUM sulfate ,POLYMER electrodes - Abstract
In response to the request for sustainable high performance energy storage devices, a significant interest is focused on developing environmentally friendly supercapacitors. In this context, cellulose‐based substrates for energy storage devices can be well‐engineered, lightweight, safe, thin, and flexible. Herein, a scalable, low‐cost, and easy‐to‐process approach for the preparation of supercapacitors using large area techniques like spray and blade coating is presented. Following a green strategy, all components are chosen or formulated in water‐based dispersions. Symmetric supercapacitors using common copy paper and electronic paper as the substrate, and poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) as electrodes, are realized and investigated. The novelty of this work consists of the use of composites based on detonation nanodiamonds (DNDs) and hydroxypropyl cellulose (HPC) as a solid‐state electrolyte and separator. Devices with solution electrolyte using the same HPC + DND composite but with the addition of sodium sulfate are prepared. The performance obtained using solid electrolyte (HPC + DNDs) and liquid electrolyte (HPC + DNDs + Na2SO4) on both substrates is comparable in terms of specific capacitance: ≈0.13 – 0.52 F g−1 for (HPC + DNDs) and ≈0.35 – 0.82 F g−1 for (HPC + DNDs + Na2SO4), with power density in the range of ≈19 – 24 μW cm−2. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
27. Flexible Energy Storage Devices Based on Nanocomposite Paper
- Author
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Pushparaj, Victor L., Shaijumon, Manikoth M., Kumar, Ashavani, Murugesan, Saravanababu, Ci, Lijie, Vajtai, Robert, Linhardt, Robert J., Nalamasu, Omkaram, and Ajayan, Pulickel M.
- Published
- 2007
- Full Text
- View/download PDF
28. Preparation and characterization of colorful graphene oxide papers and flexible N‐doping graphene papers for supercapacitor and capacitive deionization
- Author
-
Ying Yuan, Haichuan Zhang, Hao Zhang, Di Zheng, Geng Zhuning, Fang Zhang, Guanghe Li, Aiyang Li, and Yuquan Wei
- Subjects
Supercapacitor ,TK1001-1841 ,Materials science ,Renewable Energy, Sustainability and the Environment ,Graphene ,Capacitive deionization ,energy storage ,Materials Science (miscellaneous) ,Doping ,colorful graphene oxide ,Oxide ,Nanotechnology ,Energy storage ,Characterization (materials science) ,law.invention ,chemistry.chemical_compound ,Production of electric energy or power. Powerplants. Central stations ,chemistry ,law ,Materials Chemistry ,supercapacitor ,Energy (miscellaneous) ,flexible graphene paper ,N‐doped graphene - Abstract
An efficient method that utilizes simple techniques, easy operation, and low‐cost production to create flexible graphene‐based materials is a worthy practical challenge. A rapid strategy for preparing flexible, functional graphene oxide (GO) is introduced using GO‐ethanol dispersion filtration. The filtration process is highly efficient and drying time is significantly reduced by employing ethanol as solvent, due to the fact that ethanol is a volatile liquid. Freestanding GO papers can be harvested with ultralarge size (700 cm2), color variety, and writable characteristics. After reduction, N‐doped graphene (NDG) papers still maintain good foldability with improved electric conductivity and porous structure. When used as an electrode for a supercapacitor, the flexible NDG paper device demonstrates good electrochemical performance even with size expansion and extreme double folding. Moreover, this NDG paper capacitor device shows a good electrosorption performance for capacitive deionization of sulfate and chromate in groundwater system. These flexible GO and NDG papers promise potential to facilitate the production of graphene‐based materials for practical applications in energy and environmental related fields.
- Published
- 2020
29. Dual‐Functional Electrode Promoting Dendrite‐Free and CO2 Utilization Enabled High‐Reversible Symmetric Na‐CO2 Batteries.
- Author
-
Xu, Changfan, Qiu, Jiajia, Dong, Yulian, Li, Yueliang, Shen, Yonglong, Zhao, Huaping, Kaiser, Ute, Shao, Guosheng, and Lei, Yong
- Subjects
ELECTRODES ,ENERGY density ,ENERGY storage ,CARBON paper ,DENDRITIC crystals - Abstract
Sodium‐carbon dioxide (Na‐CO2) batteries are regarded as promising energy storage technologies because of their impressive theoretical energy density and CO2 reutilization, but their practical applications are restricted by uncontrollable sodium dendrite growth and poor electrochemical kinetics of CO2 cathode. Constructing suitable multifunctional electrodes for dendrite‐free anodes and kinetics‐enhanced CO2 cathodes is considered one of the most important ways to advance the practical application of Na‐CO2 batteries. Herein, RuO2 nanoparticles encapsulated in carbon paper (RuCP) are rationally designed and employed as both Na anode host and CO2 cathode in Na‐CO2 batteries. The outstanding sodiophilicity and high catalytic activity of RuCP electrodes can simultaneously contribute to homogenous Na+ distribution and dendrite‐free sodium structure at the anode, as well as strengthen discharge and charge kinetics at the cathode. The morphological evolution confirmed the uniform deposition of Na on RuCP anode with dense and flat interfaces, delivering enhanced Coulombic efficiency of 99.5% and cycling stability near 1500 cycles. Meanwhile, Na‐CO2 batteries with RuCP cathode demonstrated excellent cycling stability (>350 cycles). Significantly, implementation of a dendrite‐free RuCP@Na anode and catalytic‐site‐rich RuCP cathode allowed for the construction of a symmetric Na‐CO2 battery with long‐duration cyclability, offering inspiration for extensive practical uses of Na‐CO2 batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
30. Integration of UV-cured Ionogel Electrolyte with Carbon Paper Electrodes
- Author
-
Stephanie Flores Zopf and Matthew J. Panzer
- Subjects
supercapacitor ,ionogel ,ionic liquid ,carbon paper ,energy storage ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
A test bed with a coplanar architecture is employed to investigate the integration of an in situ cross-linked, polymer-supported ionogel with several commercially available, high surface area carbon paper electrodes. Specifically, a UV-cured poly(ethylene glycol) diacrylate (PEGDA)-supported ionogel electrolyte film is formed in situ against a variety of porous electrodes comprising: a carbon fiber paper, a carbon aerogel paper, and four carbon nanotube-based papers. Electrochemical impedance spectroscopy measurements reveal that the relative performance of a particular carbon paper with the neat ionic liquid is not necessarily indicative of its behavior when integrated with the solid ionogel electrolyte. The coplanar test bed can therefore serve as a useful tool to help guide the selection of suitable carbon-based electrode structures for supercapacitors that incorporate UV-cured ionogels created in situ for wearable energy storage applications.
- Published
- 2014
- Full Text
- View/download PDF
31. The Recent Progress in Cellulose Paper‐Based Triboelectric Nanogenerators.
- Author
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Liang, Shuaibo, Wang, Yanyun, Liu, Qian, Yuan, Tao, and Yao, Chunli
- Subjects
MECHANICAL energy ,ENERGY shortages ,CLEAN energy ,ENERGY conversion ,ENERGY storage ,CELLULOSE - Abstract
Developing new energy technology is a significant challenge in the context of the energy crisis. As a novel energy conversion device to convert mechanical energy into electricity, the triboelectric nanogenerator (TENG) has attracted significant attention in the past few years. The choice of component materials directly affects the cost, environmental performance, output performance, and preparation process of a TENG. In recent years, cellulose paper has become an ideal material for fabricating a TENG due to its lightweight, biodegradability, low‐cost, high flexibility, environmental friendliness, porosity, and easy modification. Cellulose paper‐based TENG has become a hot topic in the field of green energy. This paper systematically summarizes the research progress of the cellulose paper‐based TENG. The advantages of cellulose paper as raw material to fabricate a TENG, followed by introducing the different roles of cellulose paper in paper‐based TENGs, are first discussed. Then the recent progress in energy storage, performance optimization methods, hybridization, and applications of cellulose paper‐based TENGs is successively elaborated. Finally, some perspectives and challenges for the future development of cellulose paper‐based TENG are discussed to provide guidance. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
32. Paper‐Based Microfluidics for Electrochemical Applications
- Author
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Bastian J. M. Etzold, Gui-Rong Zhang, and Liu-Liu Shen
- Subjects
paper devices ,batteries ,Microfluidics ,electrochemical sensors ,microfluidics ,Reviews ,Nanotechnology ,02 engineering and technology ,Paper based ,Review ,fuel cells ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,7. Clean energy ,Energy sector ,Catalysis ,Energy storage ,0104 chemical sciences ,Electrochemistry ,Fuel cells ,Electronics ,0210 nano-technology - Abstract
Paper‐based microfluidics is characteristic of fluid transportation through spontaneous capillary action of paper and has exhibited great promise for a variety of applications especially for sensing. Furthermore, paper‐based microfluidics enables the design of miniaturized electrochemical devices to be applied in the energy sector, which is especially attractive for the rapid growing market of small size disposable electronics. This review gives a brief summary on the basics of paper chemistry and capillary‐driven microfluidic behavior, and highlights recent advances of paper‐based microfluidics in developing electrochemical sensing devices and miniaturized energy storage/conversion devices. Their structural features, working principles and exemplary applications are comprehensively elaborated and discussed. Additionally, this review also points out the existing challenges and future opportunities of paper‐based microfluidic electronics., Paper‐based microfluidics emerges as a powerful and versatile platform for constructing simple, inexpensive, environmentally‐friendly and high‐performing miniaturized electrochemical devices for various applications. This review summarizes the basics of paper‐based microfluidics and highlights some recent advances of paper‐based microfluidics in developing electrochemical sensing and energy storage/conversion devices. Their structural features, working principle and exemplary applications are comprehensively elaborated and discussed. This review also points out the existing challenges and future opportunities of paper‐based microfluidic electronics.
- Published
- 2019
33. Life cycle greenhouse gas emissions of cogeneration energy hubs at Japanese paper mills with thermal energy storage.
- Author
-
Yamaki, Ayumi, Fujii, Shoma, Kanematsu, Yuichiro, and Kikuchi, Yasunori
- Subjects
- *
GREENHOUSE gases , *PAPER mills , *LIFE cycles (Biology) , *HEAT storage , *COGENERATION of electric power & heat , *WIND power , *GAS flow , *ENERGY storage - Abstract
Variable renewable energy-based power is expected to increase toward a sustainable society, although the power cannot be dispatched effectively due to its intermittent nature. To accelerate renewable energy implementation, we simulated energy flows of paper mills installing wind energy and evaluated their potentials to function as energy hubs for appropriate early-stage design. We targeted 39 Japanese paper mills assumed to have thermal energy storage, wind–thermal energy converters and regional woody biomass installed, and analyzed the amount of power and heat selling and life cycle greenhouse gas emissions. The results for the paper mills were compared with conventional mills to examine effective conditions for greenhouse gas reduction. The amount of power or heat selling depended on the capacity of the paper mill and the installed equipment. Most paper mills could reduce greenhouse gas using thermal energy storage, wind energy, and woody biomass. The paper mill with the highest life cycle greenhouse gas reduction, compared with conventional mills, could achieve a 190% reduction. To function as a cogeneration energy hub, the equipment installed in paper mills should be designed according to the conditions of the paper mills and their regions. • Paper mills have potential as energy hubs by integrating variable renewable energy. • Thermal energy storage and wind–thermal energy converters were studied. • Energy flows and greenhouse gas emissions of paper mills were simulated. • Most mills could provide stable power and/or heat supplies and reduce emissions. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
34. Electrochemical fabrication of polyaniline/graphene paper (PANI/GP) supercapacitor electrode materials on free-standing flexible graphene paper.
- Author
-
Lv, Fengyan, Xiong, Shanxin, Wang, Xiaoqin, Chu, Jia, Zhang, Runlan, Gong, Ming, Wu, Bohua, Li, Zhen, Zhu, Changyong, Yang, Zhongfu, and Yang, Cheng
- Subjects
- *
SUPERCAPACITOR electrodes , *POLYANILINES , *GRAPHENE , *ENERGY storage , *ELECTRIC conductivity , *GRAPHENE oxide - Abstract
Free-standing flexible supercapacitive electrodes have practical application for wearable energy storage devices. In this paper, graphene paper (GP), a flexible electrode substrate, was prepared by one-step reduction of graphene oxide (GO) using HI solution. GP can be used independently as a flexible electrode with specific capacitance of 227 F/g. In order to make up for the shortage of GP specific capacitance storage, polyaniline (PANI) with high specific capacitance and good electrical conductivity was selected to composite with GP by electrochemical polymerization approach. This method to fabricate electrode material by direct electrochemical polymerization avoids the use of conductive binder and organic solvent. Owing to the specific capacitance contribution of PANI and GP, the PANI/GP composites exhibit higher specific capacitance when the polymerization time is 30 s and the polymerization voltage is 0.8 V. At 1 A/g current density, the specific capacitance of composite is up to 759 F/g, which is 3.34 times of neat GP. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. Electrodeposited Ni(OH)2 nanostructures on electro-etched carbon fiber paper for highly stable supercapacitors
- Author
-
Kazemi, Sayed Habib and Malae, Keyvan
- Published
- 2017
- Full Text
- View/download PDF
36. Waste Utilization Method for δ-MnO2 Anode Composited with MWCNT and Graphene by Embedding on Conductive Paper for Lithium-Ion Battery.
- Author
-
Zhang, Boya and Wan, Jiaqi
- Subjects
- *
WASTE recycling , *LITHIUM-ion batteries , *WASTE paper , *ELECTRIC conductivity , *ENERGY storage , *ANODES - Abstract
Lithium-ion batteries have received considerable attention as energy storage tool for modern-life equipments. However, drawbacks like low electric conductivity and volume expansion are the obstacles that hinder its application. To solve these problems, we developed a facile method using waste eggshell as hard template to reduce its particle size and change its morphology by simple hydrothermal process. Then, by utilizing waste paper, conductive paper (CP) current collector with graphene and multiwalled carbon nanotube implanted was prepared and combined with MnO2 anode material. The composite anode shows extraordinary electrochemical performances like much smaller impedance, high reversible capacity of 1767/1762 mAh/g even after 200 cycles at 100 mA/g, superior rate performance, etc. Compared with anode using metal current collectors, this composite anode will reduce weight and can be generalized to other high energy storage applications. Our environment-friendly method has far-reaching referential significance to other active materials and battery systems. A composite electrode, with δ -MnO2 as active material and conductive paper as current collector, has been synthesized and used in lithium-ion battery. Waste eggshell and waste paper were used in the synthetic process to protect environment. The electrode is much lighter and has much better electrochemical performances. This method can be generalized to other active materials and battery systems. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
37. Kinetics process for structure-engineered integrated gradient porous paper-based supercapacitors with boosted electrochemical performance.
- Author
-
Xiong, Chuanyin, Zhang, Yongkang, Xu, Jiayu, Dang, Weihua, Sun, Xuhui, An, Meng, Ni, Yonghao, and Mao, Junjie
- Subjects
ENERGY storage ,SUPERCAPACITORS ,STRUCTURAL engineering ,POROSITY ,DEAF people ,ELECTRIC capacity - Abstract
Due to their rich and adjustable porous network structure, paper-based functional materials have become a research hotspot in the field of energy storage. However, reasonably designing and making full use of the rich pore structure of paper-based materials to improve the electrochemical performance of paper-based energy storage devices still faces many challenges. Herein, we propose a structure engineering technique to develop a conductive integrated gradient porous paper-based (CIGPP) supercapacitor, and the kinetics process for the influence of gradient holes on the electrochemical performance of the CIGPP is investigated through experimental tests and COMSOL simulations. All results indicate that the gradient holes endow the CIGPP with an enhanced electrochemical performance. Specifically, the CIGPP shows a significant improvement in the specific capacitance, displays rich frequency response characteristics for electrolyte ions, and exhibits a good rate performance. Also, the CIGPP supercapacitor exhibits a low self-discharge and maintains a stable electrochemical performance in different electrolyte environments because of gradient holes. More importantly, when the CIGPP is used as a substrate to fabricate a CIGPP-PANI hybrid, it still maintains good electrochemical properties. In addition, the CIGPP supercapacitor also shows excellent stability and sensitivity for monitoring human motion and deaf-mute voicing, showing potential application prospects. This study provides a reference and feasible way for the design of structure-engineered integrated paper-based energy storage devices with outstanding comprehensive electrochemical performance. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
38. Fabrication of NiCo Layered Double Hydroxide on Carbon Fiber Paper as High Performance Binder-free Electrode for Supercapacitors.
- Author
-
Wang, You, Yin, Zhoulan, Wang, Zhixing, and Guo, Huajun
- Subjects
- *
ELECTRODE performance , *LAYERED double hydroxides , *CARBON paper , *CARBON fibers , *SUPERCAPACITORS , *ENERGY storage - Abstract
• Porous nanosheet-like NiCo LDH can be grown immediately on carbon fiber paper by electrodepositon as binder free electrode for supercapacitors • The morphology and electrochemical performance can be tuned by changing the deposition potential. • The optimized electrode can deliver excellent rate performance and cyclic stability. • This work demonstrates a simple, scalable and controllable strategy for preparing binder-free electrodes for supercapacitors. Design of binder-free electrode with high performance exhibits great glamour for energy storage devices recently. Herein, nickel cobalt layered double hydroxide (NiCo LDH) has been directly grown on carbon fiber paper (CFP) by an electrodeposition method. Thanks to the porous nanosheet-like morphology of the deposits, the high conductivity of carbon fibers, as well as the strong connection between the deposits and the substrate, the optimized electrode, labeled as NiCo LDH-2/CFP can deliver a discharge specific capacitance of 878.4 F g−1 at 1 A g−1, which can increase to 1080.0 F g−1 at 20 A g−1, exhibiting excellent rate performance. Moreover, after cycled at 5 A g−1 for 5000 cycles, the capacitance of the electrode can retain 96.1%, manifesting unique cyclic stability. This work provides a new strategy for preparing high performance binder-fee electrodes for supercapacitors, lithium batteries and catalytes. In this work, we demonstrate a simple and highly controlled electrodeposition method for the construction of porous nanosheet-like nickel cobalt layered double hydroxide that are directly grown on carbon fiber paper, which shows exceptional rate and cyclic performance. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
39. A low-cost paper-based flexible energy storage device using a conducting polymer nanocomposite.
- Author
-
Devi, Rama, Tapadia, Kavita, Kant, Tushar, Ghosale, Archana, Shrivas, Kamlesh, Karbhal, Indrapal, and Maharana, Tungabidya
- Subjects
CONDUCTING polymers ,NANOCOMPOSITE materials ,ENERGY storage ,POLYPYRROLE ,COMPOSITE materials ,NANOPARTICLES ,SUPERABSORBENT polymers - Abstract
Herein, a simple approach is demonstrated for the fabrication of a paper-based flexible symmetrical supercapacitor as an energy saving device with composite functional materials of nickel nanoparticles (Ni NPs) and polypyrrole (PPy). Specifically, an Ni@PPy nanocomposite was synthesized through a two-step process involving the growth of Ni NPs, followed by pyrrole polymerization on a paper substrate. The paper fabricated with Ni@PPy showed an electrical conductivity of 105 S cm
−1 . The paper-based flexible supercapacitor device configured with Ni@PPy/electrolyte/Ni@PPy was evaluated for electrochemical performance, and it showed a good specific capacitance of 544 F g−1 at 1 A g−1 . A better specific energy of 48 W h kg−1 , specific power of 400 W kg−1 , and good cycling stability (68.3% capacitance retention after 3000 cycles at 5 A g−1 ) were obtained for the paper-based flexible supercapacitor compared with other reported polymer-based nanocomposite materials. The obtained results suggest that the fabricated paper-based supercapacitor is inexpensive, sustainable, highly efficient, portable and flexible for a wide range of electronic applications. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
40. Fabrication of Flexible Graphene Paper/MnO2 Composite Supercapacitor Electrode through Electrodeposition of MnO2 Nanoparticles on Graphene Paper.
- Author
-
Liu, Gu, Liu, Jian, Xu, Kejun, Wang, Liuying, and Xiong, Shanxin
- Subjects
- *
ENERGY storage , *NANOPARTICLES , *GRAPHENE , *ELECTROPLATING , *SUPERCAPACITOR electrodes , *ELECTRODES - Abstract
The flexible electrodes are the crucial components for fabricating wearable supercapacitors. In this study, we present a quick and convenient method to prepare graphene paper (GP) as a flexible current collector on a large scale by an easy one‐step method. The composite electrode integrated with GP and MnO2 as a flexible supercapacitor was obtained by an electrochemical deposition method without using binder or conductive agent. The substrate (GP) of electrode not only provides mechanical strength, but also contributes energy storage capacity. The MnO2 nanoparticles deposited on the surface of GP further improved the electrochemical performance of composite. The neat GP can give a specific capacitance of 184 F/g at a current density of 1 A/g. At a current density of 1 A/g, the specific capacitance of the GP/MnO2 composite with a deposition time of 30 s is as high as 410 F/g. The method presented here shows great potential for the development of flexible electrode materials in practical energy storage devices. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
41. Flexible freestanding MoS2-based composite paper for energy conversion and storage
- Author
-
Jan Luxa, Dina Fattakhova-Rohlfing, Thomas Bein, Zdeněk Sofer, Florian Zoller, and Daniel Bouša
- Subjects
Materials science ,hydrogen evolution reaction (HER) ,Composite number ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,lcsh:Chemical technology ,01 natural sciences ,Capacitance ,lcsh:Technology ,Energy storage ,Full Research Paper ,law.invention ,law ,Energy transformation ,Nanotechnology ,General Materials Science ,lcsh:TP1-1185 ,molybdenum disulfide ,nanoarchitectonics ,Electrical and Electronic Engineering ,Composite material ,lcsh:Science ,lithium ion batteries (LIBs) ,Supercapacitor ,supercapacitors ,lcsh:T ,Current collector ,021001 nanoscience & nanotechnology ,Cathode ,lcsh:QC1-999 ,0104 chemical sciences ,flexible composites ,Nanoscience ,lcsh:Q ,ddc:620 ,0210 nano-technology ,Current density ,lcsh:Physics - Abstract
The construction of flexible electrochemical devices for energy storage and generation is of utmost importance in modern society. In this article, we report on the synthesis of flexible MoS2-based composite paper by high-energy shear force milling and simple vacuum filtration. This composite material combines high flexibility, mechanical strength and good chemical stability. Chronopotentiometric charge–discharge measurements were used to determine the capacitance of our paper material. The highest capacitance achieved was 33 mF·cm−2 at a current density of 1 mA·cm−2, demonstrating potential application in supercapacitors. We further used the material as a cathode for the hydrogen evolution reaction (HER) with an onset potential of approximately −0.2 V vs RHE. The onset potential was even lower (approximately −0.1 V vs RHE) after treatment with n-butyllithium, suggesting the introduction of new active sites. Finally, a potential use in lithium ion batteries (LIB) was examined. Our material can be used directly without any binder, additive carbon or copper current collector and delivers specific capacity of 740 mA·h·g−1 at a current density of 0.1 A·g−1. After 40 cycles at this current density the material still reached a capacity retention of 91%. Our findings show that this composite material could find application in electrochemical energy storage and generation devices where high flexibility and mechanical strength are desired.Keywords: flexible composites; hydrogen evolution reaction (HER); lithium ion batteries (LIBs); molybdenum disulfide; nanoarchitectonics; supercapacitors
- Published
- 2019
42. 25‐2: Capacitor‐Based Driving Scheme of Electrophoretic E‐Paper Display for Future Self‐Powered Applications.
- Author
-
Gu, Yifan, Zhu, Simu, Qiu, Zhiguang, Fan, Qitian, Shi, Jintao, Chen, Weichun, Peng, Lisha, Qin, Zong, Deng, Shaozhi, and Yang, Bo-Ru
- Subjects
ELECTROPHORETIC displays ,ENERGY storage ,ATHLETIC shoes ,CAPACITORS - Abstract
In recent years, electrophoretic display (EPD) attracts great attention for its ultra‐low power consumption, which is suitable for self‐powered applications. In this case, an energy storage system, simple as the capacitor, is essential for the self‐powered driving of EPDs. However, significance on the capacitor‐based driving of EPDs was underestimated in spite of its great practical value. This paper investigated the capacitor‐based driving of EPD for better performances of self‐powered EPDs. Based on this novel scheme, sports shoes with self‐powered EPD patterns were demonstrated as the future wearable applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. Facile development of cost effective and greener for all solid-state supercapacitor on paper substrate
- Author
-
Stefano Cinti, Cherif Dridi, Fabiana Arduini, Achref Chebil, Vincenzo Mazzaracchio, Chebil, A., Mazzaracchio, V., Cinti, S., Arduini, F., and Dridi, C.
- Subjects
Materials science ,020209 energy ,Energy Engineering and Power Technology ,02 engineering and technology ,engineering.material ,Energy storage ,Paper-based substrate ,chemistry.chemical_compound ,Settore CHIM/01 ,Coating ,Carbon black ,Gel electrolyte ,Graphite ink ,0202 electrical engineering, electronic engineering, information engineering ,Graphite ,Screen printing ,Electrical and Electronic Engineering ,Supercapacitor ,Prussian blue ,Nanocomposite ,Renewable Energy, Sustainability and the Environment ,021001 nanoscience & nanotechnology ,Flexible electronics ,Flexible solid state supercapacitor ,Chemical engineering ,chemistry ,engineering ,0210 nano-technology - Abstract
The introduction of paper-based platforms for developing novel energy storage devices such as supercapacitors (SCs) highlights new promising opportunities in the field of flexible electronics. Herein, the use of paper-based substrate has shown reduced manufacturing cost and simplified coating process by screen-printing technology, as well as an improvement of the multilayer structure adhesion. The SC manufactured with Graphite ink mixed with Carbon Black (CB)/Prussian blue (PB) at different weight ratios (0, 3, 4, 5, 7, and 10 wt %) shows good performances. An optimum weight ratio of carbon black/prussian blue. 4 wt % is consistent with the following features: i) specific capacitance of 253 mF/cm² at 0.01 V/s, ii) specific energy density of 0.5 mWh/cm², iii) specific power density of 0.1 mW/cm², and iv) good cycling stability (94%) after 5000 cycles. The proposed fabrication approach exhibits a simple scale-up, a low environmental impact and a decrease of manufacturing costs: it provides self-supporting electrodes based on a mixture of graphite ink and CB/PB nanocomposite.
- Published
- 2021
44. Cellulose Fiber based self-supporting paper cathode with multi-scale network structure for high performance lithium-sulfur battery.
- Author
-
Huang, Shaoyan, Xiu, Huijuan, Yin, Dingwen, Li, Na, Fan, Sha, Wu, Haiwei, Shen, Mengxia, Tian, Deliang, Wu, Minzhe, and Li, Jinbao
- Subjects
- *
LITHIUM sulfur batteries , *CELLULOSE fibers , *CATHODES , *PLANT fibers , *POTENTIAL energy , *ENERGY storage , *CARBON nanotubes - Abstract
Lithium-sulfur batteries (LSBs) are gaining attention as a potential energy storage option due to their impressive theoretical specific capacity. However, the main challenges hindering its implementation include the expansion in volume of sulfur and lithium sulfide during the conversion process of charge-discharge, the limited conductivity of the active material, and specifically, the phenomenon known as shuttle effect caused by lithium polysulfides (LiPSs). The development of high-performance LSBs have led to the need for self-supporting cathode materials that can efficiently accommodate volume expansion, build up efficient conductive pathways, and suppress shuttle effects. The poly(3,4-ethylenedioxythiophene) (PEDOT) was synthesized in situ on cellulose nanofibers (CNFs), resulting in the formation of CNF@PEDOT. Subsequently, CNF@PEDOT was combined with plant fibers (PFs) and multi-wall carbon nanotubes (MWCNTs) to fabricate a self-supporting cathode featuring a multi-scale network structure denoted as CNF@PEDOT/MWCNT/PF/S. The PFs serve as the primary backbone network, CNF@PEDOT to form the secondary conductive network, and MWCNTs act as tertiary conducting networks. In fact, the design of multi-level conductive network effectively improves the conductivity of the material, and PEDOT can further adsorb and catalyze LiPSs. The incorporation of PFs significantly enhanced the mechanical robustness of the cathode and augmented its electrolyte permeability. The self-supporting CNF@PEDOT/MWCNT/PF/S cathode exhibits an initial capacity of 1204.6 mA h g−1 when loaded with 2.4 mg cm−2 of sulfur at a rate of 0.2 C. Notably, it maintains an initial discharge specific capacity of 712.9 mA h g−1 even when the sulfur load is increased to 4.3 mg cm−2. This study presents a comprehensive framework for the development of self-supporting cathodes in LSBs. [Display omitted] • The self-supporting cathode with multi-scale network structure has been fabricated by the papermaking process. • The copious hydrogen bonds furnished by plant fibers enhance the mechanical characteristics of the material. • The efficient conductive network was formed in a self-supporting cathode by in situ polymerization of PEDOT on CNFs. • The CNF@PEDOT network with a high aspect ratio exposure of -S- functional groups for efficient anchoring of polysulfides. • The incorporation of rich multi-scale conductive network significantly improves the conductivity of cathode materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
45. Introduction of bimetallic oxide-modified carbon nanotubes for boosting the energy storage performance of NiCo-LDH based in-plane micro-supercapacitors on paper.
- Author
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Zhang, Chi, Zhu, Zhixiao, Zhang, Yanke, Shao, Weixuan, Wu, Di, Peng, Guannan, and Liu, Zhengchun
- Subjects
- *
ENERGY storage , *SUPERCAPACITOR electrodes , *MECHANICAL behavior of materials , *LAYERED double hydroxides , *ENERGY density , *COMPOSITE materials , *CARBON nanotubes - Abstract
• Three-dimensional WO 2 /MoO 2 @P, N-CNTs were prepared by the Self-template method. • Highly conductive and hollow structure of WO 2 /MoO 2 @P, N-CNTs avoided aggregation of NiCo-LDH. • IMSC devices were prepared by fully screen-printed technology. • IMSCs demonstrated excellent energy density (0.0590 mWh cm−2), cycling stability (100% capacity retention after 10,000 cycles) and mechanical stability (lighting the bulb under extremely distorted conditions). In-plane micro-supercapacitors (IMSCs) have greater promise for use in flexible wearable electronics than traditional stacked configurations due to their ease of integration and conformability. Nickel-cobalt layered double hydroxide (NiCo-LDH) has garnered significant interest as a stellar material for supercapacitors because of its affordable price, regular morphology, and high theoretical capacity. Unfortunately, the intrinsic poor conductivity of LDH materials prevents supercapacitors from achieving long-term stable cycling and the desired energy density. This research successfully applies the self-templated approach to prepare carbon nanotubes (CNTs) with heterogeneous architectures and numerous phase interfaces, thereby mitigating this disadvantage. Carbon nanosheets adorned with WO 2 and MoO 2 nanoparticles assemble the CNT with a typical three-dimensional structure. When combined with LDH in a suitable ratio, the composite electrode's conductivity significantly improves, providing increased capacity and cycling stability. Compared to commercial CNTs, the larger size of the prepared WO 2 /MoO 2 @P, N-CNTs serves a superior supporting and connecting role, thereby preventing the NiCo-LDH from aggregating. Under the best conditions, the composite electrode demonstrates a capacity of 1237 C/g at 1 A g−1 and an optimal capacity retention of more than 92%. For the IMSC devices, the composite materials as the positive electrode achieve an energy density of 0.0590 mWh cm−2, and no capacity degradation is observed after 10,000 cycles. In addition, bending tests have demonstrated the mechanical stability of the IMSCs. Therefore, this strategy of mixing highly conductive WO 2 /MoO 2 @P, N-CNTs can effectively improve the conductivity of the composite material and the mechanical properties of the overall device. Furthermore, this concept can be further extended to the preparation and application of other wearable devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
46. Mulberry-paper-based electrodes with hybrid nanocomposite coatings and their application to eco-friendly energy-storage devices.
- Author
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Han, Yurim, Ha, Heebo, Suryaprabha, Thirumalaisamy, Baumli, Peter, and Hwang, Byungil
- Subjects
ELECTRODE performance ,ELECTRODES ,CORPORATE bonds ,POLYMER electrodes ,NANOCOMPOSITE materials ,ENERGY storage ,ENERGY density ,NANOWIRES - Abstract
With the increasing demand for flexible energy-storage systems, mulberry paper has emerged as a suitable flexible substrate because its mechanical strength and chemical stability surpass that of A4 commercial printing papers. Mulberry paper can withstand deformation because of its high holocellulose content and low lignin content. Moreover, it is hydrophilic, which is advantageous for a simple dip-coating process. Herein, we propose a hybrid nanocomposite-coated mulberry paper, synthesized by dip-coating, as an electrode for flexible energy-storage devices. The electrode was successively coated with silver nanowires (AgNWs), carbon nanotubes, and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate. The synergetic effect of the electric double-layer and pseudocapacitive materials as well as AgNWs, is to act as a current collector and increases conductivity, resulting in a gravimetric energy density of 14.64 W h kg
−1 and gravimetric power density of 2.69 kW kg−1 at a current density of 1 A g−1 . This paper focuses on the fabrication of mulberry-paper-based electrodes with hybrid nanocomposite coatings and presents the electrochemical performance of the as-fabricated electrodes. These electrodes can be used in eco-friendly energy-storage devices because of the superiority of mulberry paper over commercial printing paper. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
47. Carbon-cement supercapacitors as a scalable bulk energy storage solution.
- Author
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Chanut, Nicolas, Stefaniuk, Damian, Weaver, James C., Yunguang Zhu, Yang Shao-Horn, Masic, Admir, and Ulm, Franz-Josef
- Subjects
- *
ENERGY storage , *CARBON paper , *SUPERCAPACITORS , *POWER resources , *TIDAL power , *ENERGY development - Abstract
The large-scale implementation of renewable energy systems necessitates the development of energy storage solutions to effectively manage imbalances between energy supply and demand. Herein, we investigate such a scalable material solution for energy storage in supercapacitors constructed from readily available material precursors that can be locally sourced from virtually anywhere on the planet, namely cement, water, and carbon black. We characterize our carbon-cement electrodes by combining correlative EDS-Raman spectroscopy with capacitance measurements derived from cyclic voltammetry and galvanostatic charge-discharge experiments using integer and fractional derivatives to correct for rate and current intensity effects. Texture analysis reveals that the hydration reactions of cement in the presence of carbon generate a fractal-like electron-conducting carbon network that permeates the load-bearing cement-based matrix. The energy storage capacity of this space-filling carbon black network of the high specific surface area accessible to charge storage is shown to be an intensive quantity, whereas the high-rate capability of the carbon-cement electrodes exhibits self-similarity due to the hydration porosity available for charge transport. This intensive and self-similar nature of energy storage and rate capability represents an opportunity for mass scaling from electrode to structural scales. The availability, versatility, and scalability of these carbon-cement supercapacitors opens a horizon for the design of multifunctional structures that leverage high energy storage capacity, highrate charge/discharge capabilities, and structural strength for sustainable residential and industrial applications ranging from energy autarkic shelters and self-charging roads for electric vehicles, to intermittent energy storage for wind turbines and tidal power stations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
48. Paper-Based Microfluidics for Electrochemical Applications.
- Author
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Liu-Liu Shen, Gui-Rong Zhang, and Etzold, Bastian J. M.
- Subjects
MICROFLUIDICS ,DISPOSABLE medical devices ,ENERGY storage ,ELECTROCHEMICAL sensors ,ELECTRONICS - Abstract
Paper-based microfluidics is characteristic of fluid transportation through spontaneous capillary action of paper and has exhibited great promise for a variety of applications especially for sensing. Furthermore, paper-based microfluidics enables the design of miniaturized electrochemical devices to be applied in the energy sector, which is especially attractive for the rapid growing market of small size disposable electronics. This review gives a brief summary on the basics of paper chemistry and capillary-driven microfluidic behavior, and highlights recent advances of paper-based microfluidics in developing electrochemical sensing devices and miniaturized energy storage/conversion devices. Their structural features, working principles and exemplary applications are comprehensively elaborated and discussed. Additionally, this review also points out the existing challenges and future opportunities of paper-based microfluidic electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
49. Free-standing Reduced Graphene Oxide/Carbon Nanotube Paper for Flexible Sodium-ion Battery Applications
- Author
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Yong Hao and Chunlei Wang
- Subjects
Paper ,Materials science ,anode ,Oxide ,Pharmaceutical Science ,chemistry.chemical_element ,Electrons ,02 engineering and technology ,Carbon nanotube ,010402 general chemistry ,Electrochemistry ,7. Clean energy ,01 natural sciences ,Energy storage ,Article ,Analytical Chemistry ,law.invention ,lcsh:QD241-441 ,chemistry.chemical_compound ,Electric Power Supplies ,Electricity ,lcsh:Organic chemistry ,law ,Drug Discovery ,Humans ,Physical and Theoretical Chemistry ,Electrodes ,reduced graphene oxide/carbon nanotube (rgo/cnt) ,free-standing ,Graphene ,Nanotubes, Carbon ,Organic Chemistry ,Sodium ,Sodium-ion battery ,Electrochemical Techniques ,Cations, Monovalent ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Anode ,chemistry ,Chemical engineering ,Chemistry (miscellaneous) ,Molecular Medicine ,sodium-ion batteries ,Graphite ,flexible ,0210 nano-technology ,Carbon - Abstract
We propose a flexible, binder-free and free-standing carbonaceous paper fabricated via electrostatic spray deposition using reduced graphene oxide/carbon nanotube (rGO/CNT) as a promising electrode material for flexible sodium-ion batteries (NIBs). The as-prepared rGO/CNT paper exhibits a three-dimensional (3D) layered structure by employing rGO as conductive frameworks to provide sodium-storage active sites and CNT as spacer to increase rGO interlayer distance and benefit the diffusion kinetics of sodium ions. Consequently, the rGO/CNT paper delivers an enhanced sodium ion storage capacity of 166.8 mAh g&minus, 1 at 50 mA g-1, retaining an average capacity of 101.4 mAh g&minus, 1 when current density sets back 100 mA g&minus, 1 after cycling at various current rates. An average capacity of 50 mAh g&minus, 1 at 200 mA g&minus, 1 was stabilized when cycling up to 300 cycles. The well-maintained electrochemical performance of free-standing rGO/CNT paper is due to the well-established hybrid 3D nanostructures, which demonstrates our carbon based material fabricated by a facile approach can be applied as one of the high-performance and low-cost electrode materials for applications in flexible energy storage devices.
- Published
- 2020
50. Nanodiamond-Based Separators for Supercapacitors Realized on Paper Substrates
- Author
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Elena Palmieri, Valerio Manca, Silvia Orlanducci, Giuseppina Polino, Alessandro Scaramella, Emanuela Tamburri, and Francesca Brunetti
- Subjects
Materials science ,02 engineering and technology ,Electrolyte ,engineering.material ,010402 general chemistry ,Settore CHIM/03 ,7. Clean energy ,01 natural sciences ,Capacitance ,cellulose separators ,chemistry.chemical_compound ,paper-based supercapacitors ,Coating ,PEDOT:PSS ,Fast ion conductor ,Nanodiamond ,solid electrolytes ,4-ethylenedioxythiophene)-poly(styrenesulfonate) ,Supercapacitor ,Hydroxypropyl cellulose ,energy storage ,poly(3 ,nanodiamonds ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,General Energy ,Chemical engineering ,chemistry ,engineering ,0210 nano-technology - Abstract
In response to the request for sustainable high performance energy storage devices, a significant interest is focused on developing environmentally friendly supercapacitors. In this context, cellulose-based substrates for energy storage devices can be well-engineered, lightweight, safe, thin, and flexible. Herein, a scalable, low-cost, and easy-to-process approach for the preparation of supercapacitors using large area techniques like spray and blade coating is presented. Following a green strategy, all components are chosen or formulated in water-based dispersions. Symmetric supercapacitors using common copy paper and electronic paper as the substrate, and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) as electrodes, are realized and investigated. The novelty of this work consists of the use of composites based on detonation nanodiamonds (DNDs) and hydroxypropyl cellulose (HPC) as a solid-state electrolyte and separator. Devices with solution electrolyte using the same HPC + DND composite but with the addition of sodium sulfate are prepared. The performance obtained using solid electrolyte (HPC + DNDs) and liquid electrolyte (HPC + DNDs + Na2SO4) on both substrates is comparable in terms of specific capacitance: approximate to 0.13 - 0.52 F g(-1) for (HPC + DNDs) and approximate to 0.35 - 0.82 F g(-1) for (HPC + DNDs + Na2SO4), with power density in the range of approximate to 19 - 24 mu W cm(-2).
- Published
- 2020
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