Potential window alignment regulating ion transfer in faradaic junctions for efficient photoelectrocatalysis

Hongzheng Dong, Xiangyu Pan, Yuancai Gong, Mengfan Xue, Pin Wang, SocMan Ho-Kimura, Yingfang Yao, Hao Xin (), Wenjun Luo () and Zhigang Zou
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Hongzheng Dong: Nanjing University
Xiangyu Pan: Nanjing University of Posts & Telecommunications
Yuancai Gong: Nanjing University of Posts & Telecommunications
Mengfan Xue: Nanjing University
Pin Wang: Nanjing University
SocMan Ho-Kimura: University of Macau
Yingfang Yao: Nanjing University
Hao Xin: Nanjing University of Posts & Telecommunications
Wenjun Luo: Nanjing University
Zhigang Zou: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract In the past decades, a band alignment theory has become a basis for designing different high-performance semiconductor devices, such as photocatalysis, photoelectrocatalysis, photoelectrostorage and third-generation photovoltaics. Recently, a faradaic junction model (coupled electron and ion transfer) has been proposed to explain charge transfer phenomena in these semiconductor heterojunctions. However, the classic band alignment theory cannot explain coupled electron and ion transfer processes because it only regulates electron transfer. Therefore, it is very significant to explore a suitable design concept for regulating coupled electron and ion transfer in order to improve the performance of semiconductor heterojunctions. Herein, we propose a potential window alignment theory for regulating ion transfer and remarkably improving the photoelectrocatalytic performance of a MoS2/Cd-Cu2ZnSnS4 heterojunction photocathode. Moreover, we find that a faradaic potential window, rather than the band position of the intermediate layer, is a criterion for identifying interface charge transfer direction. This finding can offer different perspectives for designing high-performance semiconductor heterojunctions with suitable potential windows for solar energy conversion and storage.

Date: 2023
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DOI: 10.1038/s41467-023-43916-6

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