CdTe/CdSe-sensitized photocathode coupling with Ni-substituted polyoxometalate catalyst for photoelectrochemical generation of hydrogen  

作　　者：Junhao Zhang Mo Zhang Yuanyuan Dong Congcong Bai Yeqin Feng Le Jiao Hongjin Lv 

机构地区：[1]MOE Key Laboratory of Cluster Science,School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 102488,China

出　　处：《Nano Research》2022年第2期1347-1354,共8页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.21871025 and 21831001);the Recruitment Program of Global Experts(Young Talents);BIT Excellent Young Scholars Research Fund.

摘　　要：In terms of photoelectrochemical(PEC)hydrogen evolution,substantial challenge still remains regarding the controllable fabrication of quantum dots(QDs)-sensitized photocathodes with enhanced visible-light absorption,efficient charge carrier separation,and directional migration at the electrode interface.In this work,the CdTe/CdSe QDs-sensitized photocathodes were delicately constructed on p-type NiO-coated indium tin oxide(ITO)electrodes by spin-coating approach.The resulting co-sensitized photocathode exhibits a favorable pseudo-Type Ⅱ energetic band alignment that combines the advantages of strong light absorption of constituent QDs as well as the effective and oriented charge separation and migration.Upon green LED light illumination,the photogenerated electrons could be effectively transferred to a tetra-nickel-substituted polyoxometalate catalyst for hydrogen production while photogenerated holes will be scavenged at the NiO/ITO electrode.Under minimally optimized conditions,the pseudo-Type Ⅱ CdTe/CdSe-sensrtized photocathode yields a photcx:urrent density of over 100 pA/cm^(2) and a Faradaic efficiency of〜100%,which is among one of the most efficient QDs-based photocathode systems coupling with Ni-substituted polyoxometalate catalyst for photoelectrochemical hydrogen generation.

关 键 词：POLYOXOMETALATES quantum dots-sensitized photocathode favorable energetic gradient photoelectrochemical water splitting hydrogen generation 

分 类 号：O64[理学—物理化学]