Promoting the charge separation and photoelectrocatalytic water reduction kinetics of Cu_(2)O nanowires via decorating dual-cocatalysts  

作　　者：Mengmeng Zhang Jiajun Wang Yang Wang Jinfeng Zhang Xiaopeng Han Yanan Chen Yuesheng Wang Zaghib Karim Wenbin Hu Yida Deng 

机构地区：[1]School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin,300072,China [2]Center of Excellence in Transformation Electrification and Energy Storage,Hydro-Québec,1806 Boulevard Lionel-Boulet,Varennes,Québec,J3X 1S1,Canada [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou,350207,China

出　　处：《Journal of Materials Science & Technology》2021年第3期119-127,共9页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(Nos.51571151,51701139,51671143,and U1601216);the China Postdoctoral Science Foundation(2019M661014);the Tianjin Natural Science Foundation(No.16JCYBJC17600)。

摘　　要：Developing high activity and low-cost materials to produce hydrogen by the sustainable way of photoelectrochemical is key to social development.The abundance and inexpensive Cu_(2)O has been received increasing research as its suitable energy level for photocatalytic water reduction.However,the fast charge recombination rate and the sluggish catalytic kinetics are the huge challenges facing the Cu_(2)O photoreduction.Here,the highly reactive Cu_(2)O@C-MoS_(2)photocathode is constructed by depositing dual-cocatalysts of the carbon layer and MoS_(2)nanosheets on Cu_(2)O nanowires to realize efficient water reduction.An impressive carrier concentration of 6.59×10^(23)cm^(-3)is received,which is 2.78 times of the bare Cu_(2)O,resulting in remarkable enhancement in photocurrent density of 3.34 times for the Cu_(2)O@CMoS_(2)photocathode.Moreover,the applied bias photon-to-current conversion efficiency of the bare Cu_(2)O enhanced 4.5 times from 0.16%to 0.72%in the Cu_(2)O@C-MoS_(2)photocathode.The analysis shows that the Cu_(2)O as light absorber,the carbon layer as electron transfer promoter,and MoS_(2)nanosheets as catalytic sites,thus facilitating chrage separation and enhancing catalytic kinetics.This system paves a feasible strategy for designing other photoelectrodes to realize efficient charge separation and high catalytic activity.

关 键 词：Photoelectrochemical water reduction Cu_(2)O nanowires Dual-cocatalysts modification Photocathode Charge separation 

分 类 号：TQ116.2[化学工程—无机化工] TQ426