N and O vacancies regulation over semiconductor heterojunction to synergistically boost photocatalytic hydrogen peroxide production  

作　　者：Chaoqian Ai Bing Luo Chunyang Zhang Yadi Wang Baoyuan Wang Lijing Ma Dengwei Jing 

机构地区：[1]International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China [3]Department of Chemical Engineering,School of Water and Environment&Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas,Ministry of Education Chang’an University,Xi’an 710054,China

出　　处：《Journal of Materials Science & Technology》2024年第29期237-247,共11页材料科学技术(英文版)

基　　金：financially supported by the Shaanxi Provin-cial Natural Science Basic Research Program(No.2023-JC-YB-457);the National Natural Science Foundation of China(Nos.52025061 and 52106270);the China Postdoctoral Science Foun-dation(No.2020M683472);the China Fundamental Research Funds for the Central Universities;supported by the Zhuhai Innovation and Entrepreneurship Team Project(No.2120004000225);the Project of Shaanxi Provincial Science and Technology Innovation Team(No.2023-CX-TD-25).

摘　　要：Defect engineering represents a potent strategy for the modification of electronic properties by introducing atomic vacancies in photocatalysts.However,the synergistic enhancement attributable to different types of atomic vacancies within a heterojunction,as well as their underlying mechanisms,remains sparsely studied.Here,the flexible g-C_(3)N_(4)materials with varying nitrogen vacancies were prepared via a facile calcination method under different atmospheric conditions and then composited with CeO_(2)nanocubes to construct Z-scheme heterojunction.It was observed that CeO_(2)has abundant O vacancies,and the g-C_(3)N_(4)form tertiary nitrogen defects at the center of the heptazine units under an NH3 atmosphere treatment.The resulting enhancement in the interfacial built-in electric field,coupled with the synergistic effect of O and N vacancies within the Z-scheme heterojunction,has been demonstrated to significantly enhance charge transfer efficiency.This results in an optimized photoactivity with a H_(2)O_(2)generation rate of 2.01 mmol g^(-1)h^(-1).This work opens an avenue for constructing and optimizing the heterogeneous photocatalysts by defect engineering technology,and provides deep insight to understand the nature of vacancy engineering in designing effective catalysts for solar energy conversion.

关 键 词：PHOTOCATALYSIS H_(2)O_(2) production Z-scheme Defect engineering Synergy effect 

分 类 号：O61[理学—无机化学]