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

Chaoqian Ai ¹Bing Luo ²Chunyang Zhang ¹Yadi Wang ³Baoyuan Wang ¹Lijing Ma ¹Dengwei Jing¹

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作者信息

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
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Abstract

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.

Key words

Photocatalysis/H2O2 production/Z-scheme/Defect engineering/Synergy effect

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基金项目

Shaanxi Provincial Natural Science Basic Research Program(2023-JC-YB-457)

National Natural Science Foundation of China(52025061)

National Natural Science Foundation of China(52106270)

China Postdoctoral Science Foundation(2020M683472)

China Fundamental Research Funds for the Central Universities()

Zhuhai Innovation and Entrepreneurship Team Project(2120004000225)

Project of Shaanxi Provincial Science and Technology Innovation Team(2023-CX-TD-25)

出版年

2024

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)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量43

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