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201. CsPbBr3 Quantum Dots‐Sensitized Mesoporous TiO2 Electron Transport Layers for High‐Efficiency Perovskite Solar Cells.

Author

Duan, Linrui, Zhang, Hong, Eickemeyer, Felix T., Gao, Jing, Zakeeruddin, Shaik M., Grätzel, Michael, and Luo, Jingshan

Subjects
SOLAR cells, PEROVSKITE, ELECTRON transport
Abstract

The article focuses on the use of CsPbBr3 quantum dots (QDs) to sensitize mesoporous Titanium dioxide (TiO2) electron transport layers in order to achieve high-efficiency perovskite solar cells.

Published
2023
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205. Solar cells and photocatalytic systems: general discussion

Author

Maier, Joachim, primary, Liu, Pengfei, additional, Hu, Xile, additional, Stucky, Galen, additional, Sun, Shi-Gang, additional, Chen, Liang, additional, Han, Wei, additional, Whang, Dong Ryeol, additional, Chen, Gang, additional, Zhan, Chao, additional, He, Jian, additional, Cronin, Lee, additional, Yang, Shihe, additional, Reisner, Erwin, additional, Long, Lulu, additional, Mount, Andrew, additional, Seshadri, Ram, additional, Yang, Xudong, additional, Pan, Fuping, additional, Liu, Hong, additional, Li, Zhonghua, additional, Tian, Zhongqun, additional, Frei, Heinz, additional, Luo, Jingshan, additional, Li, Fei, additional, Du, Pingwu, additional, Wang, Baohua, additional, Li, Yu, additional, Zhao, Yicheng, additional, Sun, Licheng, additional, Hisatomi, Takashi, additional, Li, Can, additional, Zhu, Kai, additional, Park, Nam-Gyu, additional, Wang, Huiqiong, additional, and Grätzel, Michael, additional

Published
2014
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208. A novel photoanode with three-dimensionally, hierarchically ordered nanobushes for highly efficient photoelectrochemical cells

Author

Karuturi, Siva, Luo, Jingshan, Cheng, Chuanwei, Liu, Lijun, Su, Liap Tat, Tok, Alfred ling Yoong, Fan, Hongjin, Karuturi, Siva, Luo, Jingshan, Cheng, Chuanwei, Liu, Lijun, Su, Liap Tat, Tok, Alfred ling Yoong, and Fan, Hongjin

Abstract

A 3D hierarchically ordered nanobush structure is fabricated for use as a photoanode in photoelectrochemical cells. The photoanode structure has several favorable intrinsic characteristics, including high interface area, direct electron transport pathways, and engineered light scattering centers. Sensitization with CdS quantum dots is demonstrated, and this nanobush photoanode is expected to be advantageous also in solar cells.

Published
2012

209. Homogeneous photosensitization of complex TiO 2 nanostructures for efficient solar energy conversion

Author

Luo, Jingshan, Karuturi, Siva, Liu, Lijun, Su, Liap Tat, Tok, Alfred ling Yoong, Fan, Hong Jin, Luo, Jingshan, Karuturi, Siva, Liu, Lijun, Su, Liap Tat, Tok, Alfred ling Yoong, and Fan, Hong Jin

Abstract

TiO 2 nanostructures-based photoelectrochemical (PEC) cells are under worldwide attentions as the method to generate clean energy. For these devices, narrow-bandgap semiconductor photosensitizers such as CdS and CdSe are commonly used to couple with TiO 2 in order to harvest the visible sunlight and to enhance the conversion efficiency. Conventional methods for depositing the photosensitizers on TiO 2 such as dip coating, electrochemical deposition and chemical-vapor-deposition suffer from poor control in thickness and uniformity, and correspond to low photocurrent levels. Here we demonstrate a new method based on atomic layer deposition and ion exchange reaction (ALDIER) to achieve a highly controllable and homogeneous coating of sensitizer particles on arbitrary TiO 2 substrates. PEC tests made to CdSe-sensitized TiO 2 inverse opal photoanodes result in a drastically improved photocurrent level, up to ∼15.7 mA/cm 2 at zero bias (vs Ag/AgCl), more than double that by conventional techniques such as successive ionic layer adsorption and reaction.

Published
2012

213. Light Harvesting: Photon Upconversion in Hetero‐nanostructured Photoanodes for Enhanced Near‐Infrared Light Harvesting (Adv. Mater. 11/2013)

Author

Su, Liap Tat, primary, Karuturi, Siva Krishna, additional, Luo, Jingshan, additional, Liu, Lijun, additional, Liu, Xinfeng, additional, Guo, Jun, additional, Sum, Tze Chien, additional, Deng, Renren, additional, Fan, Hong Jin, additional, Liu, Xiaogang, additional, and Tok, Alfred Iing Yoong, additional

Published
2013
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223. Bipolar Membrane-Assisted Solar Water Splitting in Optimal pH.

Author

Luo, Jingshan, Vermaas, David A., Bi, Dongqin, Hagfeldt, Anders, Smith, Wilson A., and Grätzel, Michael

Subjects
*BIPOLAR transistors, *ELECTROLYSIS, *ELECTROCHEMISTRY, *SOLAR energy, *ELECTROCATALYSTS, *PEROVSKITE
Abstract

An efficient and intrinsically safe bias‐free solar‐driven water‐splitting device composed of perovskite light harvesters, Earth‐abundant catalysts, and a bipolar membrane is demonstrated. Overall, 10 mA cm−2 current density with 1.63 V bias voltage for electrochemical water splitting and 12.7% solar to hydrogen conversion efficiency for solar‐driven water splitting are achieved. [ABSTRACT FROM AUTHOR]

Published
2016
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235. Over 20% PCE perovskite solar cells with superior stability achieved by novel and low-cost hole-transporting materials

Author

Zhang, Fei, Wang, Zhiqiang, Zhu, Hongwei, Pellet, Norman, Luo, Jingshan, Yi, Chenyi, Liu, Xicheng, Liu, Hongli, Wang, Shirong, Li, Xianggao, Xiao, Yin, Zakeeruddin, Shaik Mohammed, Bi, Dongqin, and Grätzel, Michael

Abstract

The exploration of alternative low-cost molecular hole-transporting materials (HTMs) for both highly efficient and stable perovskite solar cells (PSCs) is a relatively new research area. Two novel HTMs using the thiophene core were designed and synthesized (Z25 and Z26). The perovskite solar cells based on Z26 exhibited a remarkable overall power conversion efficiency (PCE) of 20.1%, which is comparable to 20.6% obtained with spiroOMeTAD. Importantly, the devices based-on Z26 show better stability compared to devices based on Z25 and spiroOMeTAD when aged under ambient air of 30% or 85% relative humidity in the dark and under continuous full sun illumination at maximum power point tracking respectively. The presented results demonstrate a simple strategy by introducing double bonds to design hole-transporting materials for highly efficient and stable perovskite solar cells with low cost, which is important for commercial application.

Published
2017
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237. Targeting Ideal Dual-Absorber Tandem Water Splitting Using Perovskite Photovoltaics and CuIn xGa1- xSe2 Photocathodes.

Author

Luo, Jingshan, Li, Zhen, Nishiwaki, Shiro, Schreier, Marcel, Mayer, Matthew T., Cendula, Peter, Lee, Yong Hui, Fu, Kunwu, Cao, Anyuan, Nazeeruddin, Mohammad Khaja, Romanyuk, Yaroslav E., Buecheler, Stephan, Tilley, S. David, Wong, Lydia Helena, Tiwari, Ayodhya N., and Grätzel, Michael

Subjects
*WATER electrolysis, *PEROVSKITE, *PHOTOELECTROCHEMICAL cells, *SEMICONDUCTORS, *PHOTOVOLTAIC power generation
Abstract

Efficient sunlight-driven water splitting devices can be achieved by pairing two absorbers of different optimized bandgaps in an optical tandem design. With tunable absorption ranges and cell voltages, organic-inorganic metal halide perovskite solar cells provide new opportunities for tailoring top absorbers for such devices. In this work, semitransparent perovskite solar cells are developed for use as the top cell in tandem with a smaller bandgap photocathode to enable panchromatic harvesting of the solar spectrum. A new CuIn xGa1- xSe2 multilayer photocathode is designed, exhibiting excellent performance for photoelectrochemical water reduction and representing a near-ideal bottom absorber. When pairing it below a semitransparent CH3NH3PbBr3-based solar cell, a solar-to-hydrogen efficiency exceeding 6% is achieved, the highest value yet reported for a photovoltaic-photoelectrochemical device utilizing a single-junction solar cell as the bias source under one sun illumination. The analysis shows that the efficiency can reach more than 20% through further optimization of the perovskite top absorber. [ABSTRACT FROM AUTHOR]

Published
2015
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238. MoS2 architectures supported on graphene foam/carbon nanotube hybrid films: highly integrated frameworks with ideal contact for superior lithium storage.

Author

Wang, Jin, Liu, Jilei, Luo, Jingshan, Liang, Pei, Chao, Dongliang, Lai, Linfei, Lin, Jianyi, and Shen, Zexiang

Abstract

Three-dimensional (3D) nanoworm-like MoS2 architectures have been successfully synthesized and directly supported on graphene foam/carbon nanotubes (GF/CNT) hybrid films. The sp2-hybridized GF/CNT films provide robust frameworks with an ideal contact for the nucleation and subsequent massive growth of the MoS2 architectures, while acting as an efficient current collector with a conductive contact for binder-free electrodes. The as-prepared hierarchical MoS2@GF/CNT electrode shows capacities of 1368 mA h g−1 and 823 mA h g−1 at current densities of 200 mA g−1 and 5000 mA g−1, and can retain 81.3% of the initial reversible capacity up to 120 cycles. [ABSTRACT FROM AUTHOR]

Published
2015
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240. Solution Transformation of Cu2O into CuInS2for Solar Water Splitting.

Author

Luo, Jingshan, Tilley, S. David, Steier, Ludmilla, Schreier, Marcel, Mayer, Matthew T., Fan, Hong Jin, and Grätzel, Michael

Subjects
*COPPER oxide, *SOLUTION (Chemistry), *WATER, *PHOTOCATHODES, *BAND gaps, *ENERGY consumption
Abstract

ThoughCu2O has demonstrated high performance as a photocathodefor solar water splitting, its band gap is too large for efficientuse as the bottom cell in tandem configurations. Accordingly, copperchalcopyrites have recently attracted much attention for solar watersplitting due to their smaller and tunable band gaps. However, theirfabrication is mainly based on vacuum evaporation, which is an expensiveand energy consuming process. Here, we have developed a novel andlow-cost solution fabrication method, and CuInS2was chosenas a model material due to its smaller band gap compared to Cu2O and relatively simple composition. The nanostructured CuInS2electrodes were synthesized at low temperature in crystallineform by solvothermal treatment of electrochemically deposited Cu2O films. Following the coating of overlayers and decorationwith Pt catalyst, the as-fabricated CuInS2electrode demonstratedwater splitting photocurrents of 3.5 mA cm–2undersimulated solar illumination. To the best of our knowledge, this isthe highest performance yet reported for a solution-processed copperchalcopyrite electrode for solar water splitting. Furthermore, theelectrode showed good stability and had a broad incident photon-to-currentefficiency (IPCE) response to wavelengths beyond 800 nm, consistentwith the smaller bandgap of this material. [ABSTRACT FROM AUTHOR]

Published
2015
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241. Review of Inorganic Hole Transport Materials for Perovskite Solar Cells

Author

Jing, Xin, Zhang, Zhuang, Chen, Tianyang, and Luo, Jingshan

Abstract

In the last decade, perovskite solar cells have witnessed great progress with a certified photoelectric conversion efficiency of 25.7%, which is comparable to single‐crystal silicon solar cells, but the stability issue still restricts commercialization. As a solution to stability improvement, inorganic hole transport materials (HTMs) are widely studied due to their excellent stability compared to traditional organic HTMs, as well as low fabrication cost and high conductivity. Herein, the intrinsic properties of widely studied inorganic p‐type materials for HTMs, their fabrication methods, and the progress that has been made with them are summarized. In addition, the cost of various inorganic HTMs is also discussed. Inorganic hole transport materials (HTMs) have emerged as promising alternatives to organic HTMs due to their moderate cost and conspicuous long‐term stability. Herein, the intrinsic properties of widely studied inorganic p‐type materials for HTMs, covering hole‐transporting conductivity, the energy levels, and stability are summarized. Additionally, their fabrication methods, advanced progress, and cost comparisons are also discussed.

Published
2023
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242. A coupled electrochemical system for CO2capture, conversion and product purification

Author

Wang, Mang and Luo, Jingshan

Abstract

The efficient utilization of carbon dioxide (CO2) as a resource, comprises three key processes: CO2capture, catalytic conversion and product purification. Using the renewable electricity to drive these processes provides a promising pathway for mitigating the ever-increasing atmospheric CO2concentration whilst simultaneously addressing the growing energy demand. Although each of the three individual processes has been extensively investigated during the past decade, the rapid and economically viable reduction of CO2emissions still calls for the development of an integrated electrochemical system driven by the renewable electricity to achieve carbon neutrality. Herein, we report a systematic protocol to bridge the three individual CO2utilization processes into one coupled electrochemical system: a bipolar membrane electrodialysis (BPMED) cell generating alkaline and acidic solutions for the capture and recovery of CO2, a flow cell with an Ag gas diffusion electrode (GDE) for the selective electrocatalytic reduction of the recovered CO2, and an alkaline solution container for the purification of the gaseous products and recycle of the unreacted CO2. Consequently, the coupled electrochemical system successfully captured CO2from the simulated flue gas and converted it into a pure syngas stream.

Published
2023
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243. Three-Dimensional Co3O4@MnO2 Hierarchical Nanoneedle Arrays: Morphology Control and Electrochemical Energy Storage.

Author

Kong, Dezhi, Luo, Jingshan, Wang, Yanlong, Ren, Weina, Yu, Ting, Luo, Yongsong, Yang, Yaping, and Cheng, Chuanwei

Subjects
*POROUS semiconductors, *LITHIUM-ion batteries, *SUPERCAPACITORS, *ELECTROCHEMICAL electrodes, *ANODES, *ELECTRIC capacity
Abstract

In this paper, a highly ordered three-dimensional Co3O4@MnO2 hierarchical porous nanoneedle array on nickel foam is fabricated by a facile, stepwise hydrothermal approach. The morphologies evolution of Co3O4 and Co3O4@MnO2 nanostructures upon reaction times and growth temperature are investigated in detail. Moreover, the as-prepared Co3O4@MnO2 hierarchical structures are investigated as anodes for both supercapacitors and Li-ion batteries. When used for supercapacitors, excellent electrochemical performances such as high specific capacitances of 932.8 F g−1 at a scan rate of 10 mV s−1 and 1693.2 F g−1 at a current density of 1 A g−1 as well as long-term cycling stability and high energy density (66.2 W h kg−1 at a power density of 0.25 kW kg−1), which are better than that of the individual component of Co3O4 nanoneedles and MnO2 nanosheets, are obtained. The Co3O4@MnO2 NAs are also tested as anode material for LIBs for the first time, which presents an improved performance with high reversible capacity of 1060 mA h g−1 at a rate of 120 mA g−1, good cycling stability, and rate capability. [ABSTRACT FROM AUTHOR]

Published
2014
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246. Ethanol assisted cyclic voltammetry treatment of copper for electrochemical CO2reduction to ethylene

Author

Fu, Yang, Xie, Qixian, Wan, Lili, Huang, Qining, and Luo, Jingshan

Abstract

Renewable energy driven electrocatalytic reduction of carbon dioxide into fuels and chemicals is one of the promising methods to achieve carbon neutrality. However, the development of high activity and selectivity catalysts remains a great challenge. Herein, we report the cyclic voltammetry (CV) treatment of copper with a mixed aqueous electrolyte solution of KOH and ethanol to obtain highly porous nanoparticle structures (Cu–KOH/Ethanol-CV). The as-obtained catalyst achieves a Faradaic efficiency (FE) of 42.1% for ethylene production with a partial current density of −15 mA/cm2in an H-cell, and a FE of C2H4of 48.4% at the current densities of −200 mA/cm2in a flow cell. Our results demonstrate that the enhanced C2H4production in electrocatalytic CO2reduction is not only correlated to the increase of electrochemically surface area but also to the extensive exposure of defect sites. Our work provides a new and facile approach for designing efficient catalysts for C2H4production in electrocatalytic CO2reduction.

Published
2022
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247. A dopant-free spirobi[cyclopenta[2,1-b:3,4-b′]dithiophene] based hole-transport material for efficient perovskite solar cellsElectronic supplementary information (ESI) available. See DOI: 10.1039/c5mh00154d

Author

Franckeviius, Marius, Mishra, Amaresh, Kreuzer, Franziska, Luo, Jingshan, Zakeeruddin, Shaik Mohammed, and Grätzel, Michael

Abstract

We present the design and synthesis of a promising hole transporting material (HTM) using the 4,4′-spirobi[cyclopenta[2,1-b:3,4-b′]dithiophene] derivative (spiro-CPDT) as the core and triarylamines as terminal units. The implementation of the new HTM in CH3NH3PbI3-based perovskite solar cells exhibited an excellent overall power conversion efficiency (PCE) of 13.4% without the use of any dopants and additives which is comparable to 15.0% obtained using p-doped spiro-MeOTAD-based devices. Furthermore, the device based on the new HTM generated a slightly higher open circuit voltage (VOC) of 971 mV compared to a spiro-MeOTAD (VOC= 951 mV) based device. The present results demonstrate that spiro-CPDT could be an excellent building block to prepare dopant-free HTMs for perovskite solar cells and holds promise to replace the p-doped spiro-OMeTAD, which is important for the fabrication of cost-effective devices in the future.

Published
2015
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248. Rationally Designed Hierarchical TiO2@Fe2O3 Hollow Nanostructures for Improved Lithium Ion Storage.

Author

Luo, Jingshan, Xia, Xinhui, Luo, Yongsong, Guan, Cao, Liu, Jilei, Qi, Xiaoying, Ng, Chin Fan, Yu, Ting, Zhang, Hua, and Fan, Hong Jin

Abstract

Hollow and hierarchical nanostructures have received wide attention in new-generation, high-performance, lithium ion battery (LIB) applications. Both TiO2 and Fe2O3 are under current investigation because of their high structural stability (TiO2) and high capacity (Fe2O3), and their low cost. Here, we demonstrate a simple strategy for the fabrication of hierarchical hollow TiO2@Fe2O3 nanostructures for the application as LIB anodes. Using atomic layer deposition (ALD) and sacrificial template-assisted hydrolysis, the resulting nanostructure combines a large surface area with a hollow interior and robust structure. As a result, such rationally designed LIB anodes exhibit a high reversible capacity (initial value 840 mAh g−1), improved cycle stability (530 mAh g−1 after 200 cycles at the current density of 200 mA g−1), as well as outstanding rate capability. This ALD-assisted fabrication strategy can be extended to other hierarchical hollow metal oxide nanostructures for favorable applications in electrochemical and optoelectronic devices. [ABSTRACT FROM AUTHOR]

Published
2013
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