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

Yi YANG, Bei CHENG, Jiaguo YU, Linxi WANG, Wing Kei HO

Research output: Contribution to journalArticlespeer-review

1 Citation (Scopus)

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. Copyright © 2021 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Original languageEnglish
JournalNano Research
Early online date22 Jul 2021
DOIs
Publication statusE-pub ahead of print - 22 Jul 2021

Citation

Yang, Y., Cheng, B., Yu, J., Wang, L., & Ho, W. (2021). TiO₂/In₂S₃ S-scheme photocatalyst with enhanced H₂O₂-production activity. Nano Research. Advance online publication. doi: 10.1007/s12274-021-3733-0

Keywords

  • Step-scheme heterojunction
  • Photocatalytic H₂O₂ production
  • TiO₂/In₂S₃ nanofibres

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