文献类型：期刊文献

英文题名：Bi/Bi2O3/TiO2 heterojunction photocathode for high-efficiency visible-light-driven lithium-sulfur batteries: Advancing light harvesting and polysulfide conversion

作者：Yi, Shan[1];Su, Zhe[1];Chen, Hongli[1];Zhao, Zhiqiang[1];Wang, Xiaowei[1];Zhang, Yayun[1];Niu, Bo[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：348

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20241115744514);WOS:【SCI-EXPANDED(收录号:WOS:001198052000001)】；

基金：Acknowledgements This work was supported by National Natural Science Foundation of China (No. 22078100, No. 52102098, and No. 22008073) and Funda- mental Research Funds for the Central Universities (No. 222201718002) .

语种：英文

外文关键词：Visible-light-driven; Li2S6-based photoelectrochemical lithium-sulfur batteries; Light harvesting; Polysulfide conversion; Photo-charging

摘要：Integrating solar-electrical energy conversion and electrical-chemical energy storage functions within a single device offers a promising strategy for efficient light harvesting, conversion, and storage of renewable solar energy. Herein, we develop visible-light-driven photoelectrochemical Li2S6-based lithium-sulfur batteries (VPLSBs) for simultaneous energy conversion and storage, employing a versatile Bi/Bi2O3/TiO2 photocathode as both a light harvester and redox catalyst. The narrowed band gap of photocathode minimizes photoelectron-hole recombination, enabling efficient light-to-electrical energy conversion. Its energy level alignment with Li-S electrochemical potentials facilitates the photocarriers' participation in polysulfide conversions, supporting electrical-to-chemical energy storage. Under visible light, the Bi/Bi2O3/TiO2 photocathode exhibits a photoelectrocatalysis effect, enhancing interfacial charge transfer, reducing Li2S deposition resistance, and ensuring stable Li2S plating/stripping. Additionally, the bare photo-charging process achieves an overall energy conversion-storage efficiency of 2.58 %. The VPLSB demonstrates an exceptional specific capacity of 1484 mA h g(-1) over 900 cycles, maintaining an apparent energy efficiency of 100.2 % at 0.2 mA cm(-2).