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

Photocatalytic production of hydrogen peroxide (H 2 O 2 ) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO 2 /In 2 S 3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H 2 O 2 evolution....

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Bibliographic Details
Published in:Nano research 2023-04, Vol.16 (4), p.4506-4514
Main Authors: Yang, Yi, Cheng, Bei, Yu, Jiaguo, Wang, Linxi, Ho, Wingkei
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Carbon
Charge transfer
Chemistry and Materials Science
Condensed Matter Physics
Current carriers
Density functional theory
Electron paramagnetic resonance
Electron spin resonance
Evolution
Graphene
Heterojunctions
Hybrids
Hydrogen peroxide
Hydrogen production
Magnetic fields
Materials Science
Nanoparticles
Nanotechnology
Photocatalysis
Photocatalysts
Photoelectron spectroscopy
Photoelectrons
Quantum dots
Reduction
Research Article
Separation
Sulfur
Titanium dioxide
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Summary:Photocatalytic production of hydrogen peroxide (H 2 O 2 ) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO 2 /In 2 S 3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H 2 O 2 evolution. These composite photocatalysts show a high H 2 O 2 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 TiO 2 /In 2 S 3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O 2 reduction to H 2 O 2 follows stepwise one-electron processes. In 2 S 3 shows a much stronger interaction with O 2 than TiO 2 as well as a higher reduction ability, serving as the active sites for H 2 O 2 generation. The work provides a novel design of S-scheme photocatalyst with high H 2 O 2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-021-3733-0