Cl^(-)ions accelerating interface charge transfer in a Si/In_(2)S_(3) Faradaic junction photocathode for solar seawater splitting  

作　　者：Jun Luo Ruotong Bao Hongzheng Dong Ye Fu Dongjian Jiang Bo Wang Yuzhan Zheng Qiong Wang Wenjun Luo Zhigang Zou 

机构地区：[1]Eco-materials and Renewable Energy Research Center(ERERC),Jiangsu Key Laboratory for Nano Technology,National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China [2]National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China

出　　处：《Science China Chemistry》2024年第9期2923-2929,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22279052);the China Postdoctoral Science Foundation(2023M741613)。

摘　　要：Photoelectrocatalytic seawater splitting is a promising low-cost method to produce green hydrogen in a large scale.The effects of Cl^(-)ions in seawater on the performance of a photoanode have been reported in previous studies.However,few researches have been done on the roles of Cl^(-)ions in a photocathode.Herein,for the first time,we find that Cl^(-)ions in the electrolyte improve the photocurrent of a Si/In_(2)S_(3) photocathode by 50% at-0.6 V_(RHE).An in-situ X-ray photoelectron spectroscopy(XPS)characterization combined with the time-of-flight secondary-ion mass spectrometry by simulating photoelectrochemical conditions was used to investigate the interface charge transfer mechanism.The results suggest that there is an In_(2)^(+3)S_(3-x)(OH)_(2x)layer on the surface of In_(2)S_(3) in the phosphate buffer solution(PBS)electrolyte,which plays a role as an interface charge transfer mediator in the Si/In_(2)S_(3) photocathode.The In_(2)^(+3)S_(3-x)(OH)_(2x)surface layer becomes In_(2)^(+3)S_(3-x)(Cl)_(2x)in the PBS electrolyte with NaCl and accelerates the charge transfer rate at the In_(2)S_(3)/electrolyte interface.These results offer a new concept of regulating interface charge transfer mediator to enhance the performance of photoelectrocatalytic seawater splitting for hydrogen production.

关 键 词：solar hydrogen production interface charge transfer mechanism coupled electron and ion transfer in-situ XPS characterization In_(2)^(+3)S_(3-x)(OH)_(2x)surface layer 

分 类 号：TQ116.21[化学工程—无机化工] O643.36[理学—物理化学]