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Nano Research 2023, 16(4): 4506-4514 https://doi.org/10.1007/s12274-021-3733-0
Research Article | Issue | Published: 22 July 2021

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

Show Author's Information Yi Yang1,  Bei Cheng1,  Jiaguo Yu1,2,  Linxi Wang2( ),  Wingkei Ho3
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China
Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong 999077, China
Keywords:
step-scheme heterojunction, photocatalytic H2O2 production, TiO2/In2S3 nanofibres
Topics:
Photocatalysts
Cite this article:
Yang Y, Cheng B, Yu J, et al. TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity. Nano Research, 2023, 16(4): 4506-4514. https://doi.org/10.1007/s12274-021-3733-0
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Abstract Full text Electronic supplementary material About this article

Photocatalytic production of hydrogen peroxide (H2O2) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO2/In2S3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H2O2 evolution. These composite photocatalysts show a high H2O2 yield of 376 μmol/(L·h). The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and experiments. Density functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO2/In2S3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O2 reduction to H2O2 follows stepwise one-electron processes. In2S3 shows a much stronger interaction with O2 than TiO2 as well as a higher reduction ability, serving as the active sites for H2O2 generation. The work provides a novel design of S-scheme photocatalyst with high H2O2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.


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Electronic supplementary material
About this article

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

Show Author's information Yi Yang1, Bei Cheng1, Jiaguo Yu1,2, Linxi Wang2( ), Wingkei Ho3
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China
Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong 999077, China

Abstract

Photocatalytic production of hydrogen peroxide (H2O2) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO2/In2S3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H2O2 evolution. These composite photocatalysts show a high H2O2 yield of 376 μmol/(L·h). The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and experiments. Density functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO2/In2S3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O2 reduction to H2O2 follows stepwise one-electron processes. In2S3 shows a much stronger interaction with O2 than TiO2 as well as a higher reduction ability, serving as the active sites for H2O2 generation. The work provides a novel design of S-scheme photocatalyst with high H2O2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.

Keywords: step-scheme heterojunction, photocatalytic H2O2 production, TiO2/In2S3 nanofibres

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Publication history
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Acknowledgements

Publication history

Received: 26 April 2021
Revised: 28 June 2021
Accepted: 06 July 2021
Published: 22 July 2021
Issue date: April 2023

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52073223, 51932007, 51961135303, 21871217, U1905215 and U1705251).

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