Fluorinated-TiO2/Mn0.2Cd0.8S S-Scheme Heterojunction with Rich Sulfur Vacancies for Photocatalytic Hydrogen Production

Kehao Cheng, Jiahui Hua, Jinfeng Zhang, Chunfeng Shao*, Graham Dawson, Qinliang Liu, Dunqian Yin, Kai Dai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The quick recombination of photogenerated carriers and the high surface reaction barrier are two important aspects influencing photocatalytic hydrogen generation. In this paper, a sulfur vacancy-modified two-dimensional (2D) fluorinated-TiO2 nanosheet/Mn0.2Cd0.8S (F-TiO2/MCS) S-scheme heterojunction was synthesized by a simple hydrothermal method to accelerate photogenerated electron transfer. The formation of an S-scheme heterojunction between MCS nanoflowers and 2D F-TiO2 enhances the efficacy of photocatalytic hydrogen generation by facilitating the separation of photogenerated electron-hole pairs. Meanwhile, the sulfur vacancies of F-TiO2/MCS change the local electronic structure of the heterojunction surface by capturing photogenerated electrons, resulting in a photocatalytic hydrogen evolution rate for F-TiO2/MCS of 3197 μmol g-1 h-1, which is 4.42 times greater than that of the pure MCS. Experimental measurements and density functional theory (DFT) calculations show that the mutual synergy between the S-scheme heterojunction and the sulfur vacancies not only provides abundant H2 adsorption active sites but also promotes interfacial charge separation and migration, which improves the photocatalytic performance of the F-TiO2/MCS composite. This work holds significance for the photocatalytic hydrogen production of sulfur vacancy-modified S-scheme heterojunctions.

Original languageEnglish
Pages (from-to)7978-7988
Number of pages11
JournalACS Applied Nano Materials
Volume7
Issue number7
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • F-TiO
  • MnCdS
  • photocatalytic hydrogen production
  • S-scheme heterojunction
  • sulfur vacancy

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