Spatially charge-separated 2D homojunction for photocatalytic hydrogen production  

作　　者：Xi-Juan Wang Sai-Sai Yuan Lei Yang Ying Dong Yi-Ming Chen Wu-Xiang Zhang Chuan-Xiang Chen Qi-Tao Zhang Teruhisa Ohno 

机构地区：[1]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China [2]International Collaborative Laboratory of 2D,Materials for Optoelectronics Science and Technology of Ministry of Education,Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China [3]Department of Applied Chemistry,Faculty of Engineering,Kyushu Institute of Technology,Kitakyushu 804-8550,Japan

出　　处：《Rare Metals》2023年第12期3952-3959,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.22205084 and21805191);the Start-Up Funding of Jiangsu University of Science and Technology (No.1112932203);Guangdong Basic and Applied Basic Research Foundation (No.2020A1515010982);Shenzhen Stable Support Project (No.20200812122947002);Shenzhen Peacock Plan (No.20210802524B)。

摘　　要：Suppression of photogenerated charge recombination is crucial for efficient photocatalytic hydrogen production.Homojunctions have garnered more attention than heterojunctions due to their superior crystal binding and band structure matching.However,most homojunctions suffer from redox interference caused by continuous oxidizing and reducing phases that impede the ability to improve photocatalytic activity.Consequently,the preparation of homojunction photocatalysts with completely spatial separation of both in charge and redox phases remains challenging.Here,the preparation of a two-dimensional(2D)homojunction CeO_(2) with a back-to-back geometry and fully separated oxidizing and reducing phases is reported.The prepared CeO_(2) is composed of nanosheets with twocontrasting smooth and rough surfaces.Experimental and theoretical results indicate that the rough surface contains more highly reducing CeO_(2){220}and strongly visiblelight-absorbing CeO_(2){200}facets than the smooth surface.The 2D homojunction CeO_(2) produces three-times more hydrogen than normal CeO_(2) nanosheets,and even more than that of CeO_(2) nanosheets loaded with gold nanoparticles.This work presents a new homojunction photocatalyst model with completely spatial separation of both in charge and redox phases that is expected to inspire further research into homojunction photocatalysts.

关 键 词：HYDROGEN CHARGE SEPARATED 

分 类 号：O643.36[理学—物理化学] TQ116.2[理学—化学]