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

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外文摘要：Defect engineering represents a potent strategy for the modification of electronic properties by intro-ducing atomic vacancies in photocatalysts.However,the synergistic enhancement attributable to dif-ferent types of atomic vacancies within a heterojunction,as well as their underlying mechanisms,re-mains sparsely studied.Here,the flexible g-C3N4 materials with varying nitrogen vacancies were pre-pared via a facile calcination method under different atmospheric conditions and then composited with CeO2 nanocubes to construct Z-scheme heterojunction.It was observed that CeO2 has abundant O vacan-cies,and the g-C3N4 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 H2O2 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.

外文关键词：

PhotocatalysisH2O2 productionZ-schemeDefect engineeringSynergy effect

作者：

Chaoqian Ai、Bing Luo、Chunyang Zhang、Yadi Wang、Baoyuan Wang、Lijing Ma、Dengwei Jing

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作者单位：

International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China

School of Chemical Engineering and Technology,Xi'an Jiaotong University,Xi'an 710049,China

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

基金：

Shaanxi Provincial Natural Science Basic Research ProgramNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science FoundationChina Fundamental Research Funds for the Central UniversitiesZhuhai Innovation and Entrepreneurship Team ProjectProject of Shaanxi Provincial Science and Technology Innovation Team

项目编号：

2023-JC-YB-45752025061521062702020M68347221200040002252023-CX-TD-25

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.065

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.196(29)