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8. Manipulation of Transition Metal Migration via Cr-Doping for Better-Performance Li-Rich, Co-Free Cathodes

Author

Fan, Yameng, primary, Olsson, Emilia, additional, Johannessen, Bernt, additional, D’Angelo, Anita M., additional, Thomsen, Lars, additional, Cowie, Bruce, additional, Smillie, Lachlan, additional, Liang, Gemeng, additional, Lei, Yaojie, additional, Bo, Guyue, additional, Zhao, Yunlong, additional, Pang, Wei Kong, additional, Cai, Qiong, additional, and Guo, Zaiping, additional

Published
2024
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10. Cobalt/MXene‐derived TiO2 Heterostructure as a Functional Separator Coating to Trap Polysulfide and Accelerate Redox Kinetics for Reliable Lithium‐sulfur Battery.

Author

Chang, Zhihua, Liu, Wendong, Feng, Junan, Lin, Zenghui, Shi, Chuan, Wang, Tianyi, Lei, Yaojie, Zhao, Xiaoxian, Song, Jianjun, and Wang, Guoxiu

Subjects
LITHIUM sulfur batteries, ENERGY storage, OXIDATION-reduction reaction, ELECTRIC conductivity, ENERGY density, CATALYSIS
Abstract

Lithium‐sulfur (Li−S) batteries are one of the most potential new energy storage systems due to their high theoretical capacity (1675 mAh g−1) and high energy density (2600 Wh kg−1). However, the application of Li−S batteries is currently restricted due to the dissolution of polysulfides in the electrolyte, which leads to the shuttle effect of lithium polysulfides (LiPSs). Here, we present a Co@MXene‐derived TiO2 heterostructure decorated on carbon sheets derived from folic acid (Co@M‐TiO2/C) as a functional separator coating to trap polysulfide and accelerate redox kinetics in Li−S batteries. The interconnected porous structure with good electrical conductivity of the heterostructure boasts rapid ion diffusion and efficient electron transfer within the battery. By attaching Co and MXene‐derived dual‐phased TiO2 to two‐dimensional carbon sheets, heterostructures are formed, ensuring complete exposure of the active sites. These heterostructures exhibit catalytic effects on LiPSs and excellent adsorption capabilities, effectively inhibiting the shuttle effect and accelerating the redox kinetics. Considering these advantages, the Li−S battery with the optimized Co@M‐TiO2/C modified separator demonstrates a high specific capacity of 1481.7 mAh g−1 at 0.2 C, superior rate performance of 855.5 mAh g−1 at 2 C, and excellent cycling performance under a high sulfur load of 4.4 mg cm−2. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Enthalpy‐Driven Room‐Temperature Superwetting of Liquid Na–K Alloy as Flexible and Dendrite‐Free Anodes.

Author

Zhao, Lingfei, Tao, Ying, Lai, Wei‐Hong, Hu, Zhe, Peng, Jian, Lei, Yaojie, Cao, Yuliang, Chou, Shu‐Lei, Wang, Yun‐Xiao, Liu, Hua Kun, and Dou, Shi Xue

Subjects
LIQUID metals, BINARY metallic systems, ANODES, ALLOYS, DENDRITIC crystals, LIQUID alloys, CARBON fibers, METALLIC composites
Abstract

Sodium (Na) metal anodes are promising candidates for various batteries with high energy density and high‐power density, however, the dendrite growth of Na metal is impeding their practical applications. The binary alloy Na–K is in the liquid state at room temperature with a wide composition range, which renders it inherently free from solid dendrite growth. Whereas the application of Na–K alloy is plagued by the lack of a wettable matrix to immobilize the liquid metal. Herein, a facile method is reported to introduce oxygen‐rich functional groups into carbon fiber cloth (O‐CFC), which is initially Na–K phobic yet turns into superwetting after the treatment. The superwetting behavior of the O‐CFC can be attributed to the favorable enthalpy changes as a result of the introduction of O‐rich functional groups. The superwetting property of the O‐CFC exhibits good universality, which can be extended to melting Na and K metals. By adopting the superwetting O‐CFC as a host for liquid Na–K alloy, the liquid metal can be well retained in the matrix and deliver a stable cycling for >1600 h. The concept of enthalpy‐driven wettability regulation can be enlightening for the host material design of other liquid metals and alloys. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Engineering active sites for advanced room-temperature Na-S batteries

Author

Lei, Yaojie and Lei, Yaojie

Abstract

Room temperature sodium-sulfur (RT Na-S) batteries attract many attentions since they endow many overwhelming merits, for instances, resources abundances of S and Na, high theoretical capacity of S (1672 mAh g-1), non-toxicity, and cost-efficiency. Nevertheless, the Na-S batteries are often restrained for their poor cycling performance and inferior Coulombic efficiency, which result from the sodium polysulfide (NaPSs) dissolution and the sluggish kinetics reactions. These issues always result in fast active materials loss and rapid cycling decay. To overcome these challenges, preventing the reactions between NaPSs species on the cathode, long-chain NaPSs dissolution and improving the kinetics reaction are extremely important. Therefore, it is very important to prepare the novel hosts with proper pore structure and enough surface area to embed the active materials and provide enough volume for S expansion during the cell working. Moreover, by decoration of abundant electrocatalytic active sites, the hosts can efficiently trap and catalyze NaPSs intermediates, which is in favour of construction of RT Na-S batteries with excellent performance. In this doctoral work, three different works are investigated, including single atomic Fe grown on nanospheres (S@Fe-SA-PNC), a general strategy to fabricate single atomic sites decorated on carbon nanospheres (S@Metal-SA-PNC, Metal= Mn, Co, Ni, Cu, Sn, Pb), as well as FeS nanoparticles decorated carbon nanotubes (S@FeS-CNT).

Published
2023

19. Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Author

Wu, Can, primary, Lei, Yaojie, additional, Simonelli, Laura, additional, Tonti, Dino, additional, Black, Ashley, additional, Marini, Carlo, additional, Lu, Xinxin, additional, Lai, Wei‐Hong, additional, Cai, Xiaolan, additional, Wang, Yun‐Xiao, additional, Gu, Qinfen, additional, Chou, Shu‐Lei, additional, Liu, Hua‐Kun, additional, Wang, Guoxiu, additional, and Dou, Shi‐Xue, additional

Published
2022
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21. In Situ Plating of Mg Sodiophilic Seeds and Evolving Sodium Fluoride Protective Layers for Superior Sodium Metal Anodes

Author

Zhao, Lingfei, primary, Hu, Zhe, additional, Huang, Zhongyi, additional, Tao, Ying, additional, Lai, Wei‐Hong, additional, Zhao, Along, additional, Liu, Qiannan, additional, Peng, Jian, additional, Lei, Yaojie, additional, Wang, Yun‐Xiao, additional, Cao, Yuliang, additional, Wu, Chao, additional, Chou, Shu‐Lei, additional, Liu, Hua Kun, additional, and Dou, Shi Xue, additional

Published
2022
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23. Streamline Sulfur Redox Reactions to Achieve Efficient Room‐Temperature Sodium–Sulfur Batteries

Author

Lei, Yaojie, primary, Wu, Can, additional, Lu, Xinxin, additional, Hua, Weibo, additional, Li, Shaobo, additional, Liang, Yaru, additional, Liu, Hanwen, additional, Lai, Wei‐Hong, additional, Gu, Qinfeng, additional, Cai, Xiaolan, additional, Wang, Nana, additional, Wang, Yun‐Xiao, additional, Chou, Shu‐Lei, additional, Liu, Hua‐Kun, additional, Wang, Guoxiu, additional, and Dou, Shi‐Xue, additional

Published
2022
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29. Architecting Freestanding Sulfur Cathodes for Superior Room‐Temperature Na–S Batteries

Author

Yang, Huiling, primary, Zhou, Si, additional, Zhang, Bin‐Wei, additional, Chu, Sheng‐Qi, additional, Guo, Haipeng, additional, Gu, Qin‐Fen, additional, Liu, Hanwen, additional, Lei, Yaojie, additional, Konstantinov, Konstantin, additional, Wang, Yun‐Xiao, additional, Chou, Shu‐Lei, additional, Liu, Hua‐Kun, additional, and Dou, Shi‐Xue, additional

Published
2021
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31. Self-assembling RuO2 nanogranulates with few carbon layers as an interconnected nanoporous structure for lithium-oxygen batteries

Author

Lai, Wei, Zheng, Zhi, Wang, Wanlin, Wang, Lei, Lei, Yaojie, Wang, Yunxiao, Wang, Jiazhao, Liu, Hua-Kun, Chou, Shulei, Dou, Shi Xue, Lai, Wei, Zheng, Zhi, Wang, Wanlin, Wang, Lei, Lei, Yaojie, Wang, Yunxiao, Wang, Jiazhao, Liu, Hua-Kun, Chou, Shulei, and Dou, Shi Xue

Abstract

Electrocatalysis for cathodic oxygen is of great significance for achieving high-performance lithium-oxygen batteries. Herein, we report a facile and green method to prepare an interconnected nanoporous three-dimensional (3D) architecture, which is composed of RuO2 nanogranulates coated with few layers of carbon. The as-prepared 3D nanoporous RuO2@C nanostructure can demonstrate a high initial specific discharge capacity of 4000 mA h g-1 with high round-trip efficiency of 95%. Meanwhile, the nanoporous RuO2@C could achieve stable cycling performance with a fixed capacity of 1500 mA h g-1 over 100 cycles. The terminal discharge and charge potentials of nanoporous RuO2@C are well maintained with minor potential variation of 0.14 and 0.13 V at the 100th cycle, respectively. In addition, the formation of discharge products is monitored by using in situ high-energy synchrotron X-ray diffraction (XRD).

Published
2020

32. Electrocatalyzing S Cathodes via Multisulfiphilic Sites for Superior Room-Temperature Sodium-Sulfur Batteries

Author

Liu, Hanwen, Pei, Wei, Lai, Weihong, Yan, Zichao, Yang, Huiling, Lei, Yaojie, Wang, Yunxiao, Gu, Qinfen, Zhou, Si, Chou, Shulei, Liu, Hua-Kun, Dou, Shi Xue, Liu, Hanwen, Pei, Wei, Lai, Weihong, Yan, Zichao, Yang, Huiling, Lei, Yaojie, Wang, Yunxiao, Gu, Qinfen, Zhou, Si, Chou, Shulei, Liu, Hua-Kun, and Dou, Shi Xue

Abstract

Room-temperature sodium-sulfur (RT-Na/S) batteries hold great promise for sustainable and cost-effective applications. Nevertheless, it remains a great challenge to achieve high capacity and cycling stability due to the low activity of sulfur and the sluggish conversion kinetics between polysulfide intermediates and sodium sulfide. Herein, an electrocatalyzing S cathode is fabricated, which consists of porous core-shell structure and multisulfiphilic sites. The flexible carbon structure effectively buffers volume changes during cycling and provides enclosed spaces to store S8 with exceptional conductivity. Significantly, the multisulfiphilic sites (ZnS and CoS2) enhance catalysis toward multistep S conversion, which effectively suppresses long-chain polysulfides dissolution and improves the kinetics of short-chain polysulfides. Thus, the obtained S cathodes achieve an enhanced cycling performance (570 mAh g-1 at 0.2 A g-1 over 1000 cycles), decent rate capability (250 mAh g-1 at 1.0 A g-1 over 2000 cycles), and high energy density of 384 Wh kg-1 toward practical applications.

Published
2020

34. Tunable Carbon Surface from Mono- to Multi-Metallic Single Atoms

Author

Lai, Weihong, primary, Wang, Heng, primary, jiang, Quan, primary, Yan, Zichao, primary, Liu, Hanwen, primary, Lei, Yaojie, primary, Zhao, Lingfei, primary, Zhang, Wang, primary, Wang, Lei, primary, Yoshikawa, Hirofumi, primary, Matsumura, Daiju, primary, Wang, Yunxiao, primary, sun, Qiao, primary, Wang, Jiazhao, primary, Liu, Huakun, primary, Chou, Shulei, primary, and Dou, Shixue, primary

Published
2020
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35. Modulating Porous Carbon Electrocatalyst for Efficient Water Splitting

Author

Lei, Yaojie

Subjects
carbon, OER, electrocatalyst, HER
Abstract

The increasing public issues about the energy crisis urge the development of sustainable energy as alternatives to replace the fossil fuels. Considering the energy regeneration and environment friendly, hydrogen possesses the potential to meet the criterion of renewable and clean energies. H2 can be produced in an electrochemical water electrolyser by cathodic hydrogen evolution reaction (HER), coupled with anodic oxygen evolution reaction (OER). The kinetic barrier of both reactions require efficient electrocatalysts. However, the benchmarking electrocatalysts for HER or OER are based on precious metals, such as Pt or Ir, their high cost greatly hinders the practical H2 production from water electrolyser in an economic manner. Thus, the search of in-expensive but efficient HER and OER electrocatalysts is imminent. Among various candidature materials, low cost and high conductive carbon based nanomaterials have attracted intensive attention. Through heteroatom doping, the inert carbon nanomaterials can be activated to show promising catalytic activity. In this study, nitrogen doped nanoporous carbon electrocatalysts were obtained from thermal pyrolysis of a zinc based metal-organic framework. Cathodic treatment is successfully applied to achieve systematic modulation of the type and surface functionalities. The modulated electrocatalysts show high activity and good stability towards hydrogen and oxygen evolution in various electrolyte. Strong correlation between catalytic performance and surface chemical properties of these carbon electrocatalysts has been found. My work here paves a new way to design metal free carbon electrocatalysts for future green energy applications.

Published
2017

39. Electrocatalyzing S Cathodes viaMultisulfiphilic Sites for Superior Room-Temperature Sodium–Sulfur Batteries

Author

Liu, Hanwen, Pei, Wei, Lai, Wei-Hong, Yan, Zichao, Yang, Huiling, Lei, Yaojie, Wang, Yun-Xiao, Gu, Qinfen, Zhou, Si, Chou, Shulei, Liu, Hua Kun, and Dou, Shi Xue

Abstract

Room-temperature sodium–sulfur (RT-Na/S) batteries hold great promise for sustainable and cost-effective applications. Nevertheless, it remains a great challenge to achieve high capacity and cycling stability due to the low activity of sulfur and the sluggish conversion kinetics between polysulfide intermediates and sodium sulfide. Herein, an electrocatalyzing S cathode is fabricated, which consists of porous core–shell structure and multisulfiphilic sites. The flexible carbon structure effectively buffers volume changes during cycling and provides enclosed spaces to store S8with exceptional conductivity. Significantly, the multisulfiphilic sites (ZnS and CoS2) enhance catalysis toward multistep S conversion, which effectively suppresses long-chain polysulfides dissolution and improves the kinetics of short-chain polysulfides. Thus, the obtained S cathodes achieve an enhanced cycling performance (570 mAh g–1at 0.2 A g–1over 1000 cycles), decent rate capability (250 mAh g–1at 1.0 A g–1over 2000 cycles), and high energy density of 384 Wh kg–1toward practical applications.

Published
2020
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42. Near 100% Conversion of Acetylene to High-purity Ethylene at Ampere-Level Current.

Author

Wu Z, Zhang J, Guan Q, Liu X, Xiong H, Chen S, Hong W, Li D, Lei Y, Deng S, Wang J, and Wang G

Abstract

Direct production of high-purity ethylene from acetylene using renewable energy through electrocatalytic semi-hydrogenation presents a promising alternative to traditional thermocatalytic processes. However, the low conversion of acetylene results in a significant amount of acetylene impurities in the product, necessitating additional purification steps. Herein, a tandem electrocatalytic system that integrates acetylene electrolyzer and zinc-acetylene battery units for high-purity ethylene production is designed. The ultrathin CuO nanoribbons with enriched oxygen vacancies (CuO 1-x NRs) as electrocatalysts achieve a remarkable 93.2% Faradaic efficiency of ethylene at an ampere-level current density of 1.0 A cm -2 in an acetylene electrolyzer, and the power density reaches 3.8 mW cm -2 in a zinc-acetylene battery under acetylene stream. Moreover, the tandem electrocatalysis system delivers a single-pass acetylene conversion of 99.998% and ethylene selectivity of 96.1% at a high current of 1.4 A. Experimental data and calculations demonstrate that the presence of oxygen vacancies accelerates water dissociation to produce active hydrogen atoms while preventing the over-hydrogenation of ethylene. Furthermore, techno-economic analysis reveals that the tandem system can dramatically reduce the overall ethylene production cost compared to the conventional thermocatalytic processes. A novel strategy for complete acetylene-to-ethylene conversion under mild conditions, establishing a non-petroleum route for the production of ethylene is reported., (© 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH.)

Published
2024
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43. Design of Solid Polycationic Electrolyte to Enable Durable Chloride-Ion Batteries.

Author

Yang X, Fu Z, Han R, Lei Y, Wang S, Zhao X, Meng Y, Liu H, Zhou D, Aurbach D, and Wang G

Abstract

The high energy density and cost-effectiveness of chloride-ion batteries (CIBs) make them promising alternatives to lithium-ion batteries. However, the development of CIBs is greatly restricted by the lack of compatible electrolytes to support cost-effective anodes. Herein, we present a rationally designed solid polycationic electrolyte (SPE) to enable room-temperature chloride-ion batteries utilizing aluminum (Al) metal as an anode. This SPE endows the CIB configuration with improved air stability and safety (i.e. free of flammability and liquid leakage). A high ionic conductivity (1.3×10 -2  S cm -1 at 25 °C) has been achieved by the well-tailored coordination structure of the SPE. Meanwhile, the solid polycationic electrolyte ensures stable electrodes|electrolyte interfaces, which effectively inhibit the growth of dendrites on the Al anodes and degradation of the FeOCl cathodes. The Al|SPE|FeOCl chloride-ion batteries showcased a high discharge capacity around 250 mAh g -1 (based on the cathodes) and extended lifespan. Our electrolyte design opens a new avenue for developing low-cost chloride-ion batteries., (© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)

Published
2024
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