物理化学学报2026，Vol.42Issue(1)：79-89,11.DOI:10.1016/j.actphy.2025.100141
揭示ZnxCd1-xS固溶体光催化析氢中的直接-间接带隙跃迁机制
Unveiling the mechanism of direct-to-indirect bandgap transition in the photocatalytic hydrogen evolution of ZnxCd1-xS solid solution
摘要
Abstract
Solid solution strategy could improve the photocatalytic performance thermodynamically,yet the study focusing on the carrier dynamics of the solid solution catalysts was equally important.Herein,a series of ZnxCd1-xS solid solutions were successfully synthesized based on band structure regulation,and the carrier dynamics were investigated by femtosecond transient absorption spectroscopy(TAS)and DFT,which unveiled a variation of the mixed direct-to-indirect bandgap transition mechanism in ZnxCd1-xS solid solution.The indirect bandgap exhibited a lower photocarrier recombination rate and,more importantly,could also serve as a trapping center for photocarrier,thus promoting the efficiency of charge separation.Consequently,ZnxCd1-xS solid solutions achieved an approximately eleven-fold enhancement in the hydrogen evolution rate(1426.66 μmol h-1)relative to that of bare CdS(129.83 μmol h-1)under visible light(>420 nm).This work proposed that the enhanced photocatalytic performance could originate from both thermodynamic and kinetic aspects simultaneously,and that the alteration of the photocarrier transition mechanism is one of the main factors affecting the kinetics.关键词
ZnxCd1-xS固溶体/光催化析氢/光生载流子转移/直接-间接带隙跃迁Key words
ZnxCd1-xS solid solution/Photocatalytic hydrogen evolution/Photocarrier transfer/Direct-to-Indirect transition分类
化学化工引用本文复制引用
黄火帅,韦之栋,严嘉玮,池家晟,苏千翔,陈铭夏,江治,孙洋洲,上官文峰..揭示ZnxCd1-xS固溶体光催化析氢中的直接-间接带隙跃迁机制[J].物理化学学报,2026,42(1):79-89,11.基金项目
国家自然科学基金(22102095,21773153)、国家重点基础研究发展计划(2018YFB1502001)以及上海交通大学氢科学中心的支持. （22102095,21773153）
