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Research Article

A core-satellite structured type II heterojunction photocatalyst with enhanced CO2 reduction under visible light

Yuanyuan Cheng1, Yixian Liu1, Yunliang Liu1, Yaxi Li1, Ruqiang Wu1, Yongchao Du1, Najmeh Askari1, Naiyun Liu1, Fen Qiao1, Chenghua Sun2( ), Zhenhui Kang3( ), Haitao Li1( )
Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
Faculty of Science, Engineering & Technology, Swinburne University of Technology, Victoria 3122, Australia
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Soochow University, Suzhou 215123, China
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Graphical Abstract

A facile microwave-related synthesis method of Mn3O4/FeNbO4 type II heterojunction photocatalyst with a core-satellite structure was developed. The prepared Mn3O4/FeNbO4 type II photocatalyst exhibits obvious enhanced catalytic properties in the photocatalytic CO2 reduction reaction, where the CH4 yielding rate is 1.96 and 9.81 times those of FeNbO4 and Mn3O4, respectively. This work provides a promising strategy for designing an efficient photocatalyst applied for CO2 reduction reaction.

Abstract

Photocatalytic reduction of carbon dioxide into valuable chemicals is a sustainable and promising technology that alleviates the greenhouse effect and energy crisis. In this study, the Mn3O4/FeNbO4 type II heterojunction photocatalyst with a core-satellite structure was synthesized by the facile soft chemical method. The formation of a nano-heterojunction is supposed to effectively improve light capture, charge transfer, and interfacial charge separation in the photochemical reaction. Meanwhile, the heterojunction has a good ability to capture and activate CO2. Our results show that the prepared Mn3O4/FeNbO4 photocatalyst exhibit obvious enhanced catalytic properties in the photocatalytic CO2 reduction reaction, where the CH4 yielding rate is 1.96 and 9.81 times those of FeNbO4 and Mn3O4, respectively. The transient photovoltage test (TPV) shows that the low frequency electrons are crucial to the effective transfer of photogenerated electrons and holes in the Mn3O4/FeNbO4 nano heterojunctions. Analysis of in situ Fourier transform infrared spectroscopy (FTIR) verifies the effective CO2 adsorption on the Mn3O4/FeNbO4 surface and the high selectivity of CH4 products. These properties of the Mn3O4/FeNbO4 photocatalyst infer its broad prospects in the fields of carbon fixation and energy conservation.

Keywords

type II heterojunctionMn3O4/FeNbO4photocatalysisCO2 reduction

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Nano Research
Volume 15 Issue 10,
October 2022
Pages 8880-8889
DOI: 10.1007/s12274-022-4714-7
Cite this article:
Cheng Y, Liu Y, Liu Y, et al. A core-satellite structured type II heterojunction photocatalyst with enhanced CO2 reduction under visible light. Nano Research, 2022, 15(10): 8880-8889. https://doi.org/10.1007/s12274-022-4714-7
Topics:
PhotocatalysisPhotocatalytic activity

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Received: 24 May 2022
Revised: 27 June 2022
Accepted: 28 June 2022
Published: 05 August 2022
© Tsinghua University Press 2022
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