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Review Article

Homojunction photocatalysts for water splitting

Xiangjiu Guan1,2Shichao Zong3Shaohua Shen1( )
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Suzhou Academy of Xi’an Jiaotong University, Suzhou 215123, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Water and Environment, Chang’an University, Xi’an 710064, China
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Graphical Abstract

Methods for the construction of homojunction-based photocatalyst and the recent progress in water splitting are summarized and discussed.

Abstract

Charge-carrier separation is regarded as one of the critical issues of photocatalytic water splitting and could be accelerated by constructing microscopic junctions in photocatalysts. Homojunction photocatalysts consisting of different forms of semiconductor with identical compositions could inherit the advantages of heterojunction-based photocatalysts in charge separation due to the built-in electric field, while omitting the potential drawbacks of interfacial lattice distortion by providing continuous band bonding. Therefore, homojunction-based photocatalysts have recently drawn growing attention in water splitting. In this review, the synthetic approaches to preparing photocatalysts with various homojunction structures including p-n junction, phase junction, and facet junction were introduced, together with a comprehensive analysis and discussion on the latest progress in the application of photocatalytic water splitting. This review work is expected to inspire more related work with promoted research on designing efficient homojunction-based photocatalytic systems for water splitting.

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Nano Research
Pages 10171-10184
Cite this article:
Guan X, Zong S, Shen S. Homojunction photocatalysts for water splitting. Nano Research, 2022, 15(12): 10171-10184. https://doi.org/10.1007/s12274-022-4704-9
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Received: 14 May 2022
Revised: 21 June 2022
Accepted: 25 June 2022
Published: 23 July 2022
© Tsinghua University Press 2022
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