Bias distribution and regulation in photoelectrochemical overall water-splitting cells

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外文摘要：The water oxidation half-reaction at anodes is always considered the rate-limiting step of overall water splitting(OWS),but the actual bias distribution between photoanodes and cathodes of photoelectrochemical(PEC)OWS cells has not been investigated systematically.In this work,we find that,for PEC cells consisting of photoanodes(nickel-modified n-Si[Ni/n-Si]and α-Fe2O3)with low photovoltage(Vph＜1V),a large portion of applied bias is exerted on the Pt cathode for satisfying the hydrogen evolution thermodynamics,showing a thermodynamics-controlled characteristic.In contrast,for photoanodes(TiO2 and BiVO4)with Vph＞1V,the bias required for cathode activation can be significantly reduced,exhibiting a kinetics-controlled characteristic.Further investigations show that the bias distribution can be regulated by tuning the electrolyte pH and using alternative half-reaction couplings.Accordingly,a volcano plot is presented for the rational design of the overall reactions and unbiased PEC cells.Motivated by this,an unbiased PEC cell consisting of a simple Ni/n-Si photoanode and Pt cathode is assembled,delivering a photocurrent density of 5.3±0.2 mA cm-2.

外文关键词：

photoelectrochemistryoverall reaction cellbias distributionphotoanodewater splitting

作者：

Kun Dang、Siqin Liu、Lei Wu、Daojian Tang、Jing Xue、Jiaming Wang、Hongwei Ji、Chuncheng Chen、Yuchao Zhang、Jincai Zhao

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作者单位：

Key Laboratory of Photochemistry,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100049,China

基金：

国家重点研发计划国家重点研发计划国家自然科学基金中国科学院战略规划重点项目中国科学院战略规划重点项目CAS Project for Young Scientists in Basic Research

项目编号：

2022YFA15050002020YFC180840122072158CASXDB36000000YSBR-004

出版年：

2024

DOI：

10.1093/nsr/nwae053

国家科学评论(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.11(4)

参考文献量49