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Rational engineering bifunctional In2S3/Zn3In2S6 heterojunctions with double sulfur vacancies for efficient solar-driven photocatalytic H2 and H2O2 generation

Author

Listed:
  • Zhang, Shengqu
  • Liu, Enli
  • Liu, Jiaxing
  • Feng, Xintao
  • Jian, Yaping
  • Jiang, Yinhua
  • Hong, Yuanzhi

Abstract

The advanced photocatalytic technology with conversion of renewable solar energy to the clean hydrogen (H2) and hydrogen peroxide (H2O2) chemicals can effectively realize the national goals of “carbon emission peak & carbon neutrality”. To this end, the indium sulfide (In2S3)/zinc indium sulfide (Zn3In2S6) heterojunctions with double sulfur vacancies (Vs) were successfully prepared by a feasible in-situ hydrothermal approach. The as-formed heterojunctions (denoted as Vs-ISZIS6) showed the high-performance bifunctional activities towards the both photocatalytic H2 evolution and H2O2 generation. Especially, the 10Vs-ISZIS6 sample presented the highest photocatalytic H2 production rate (7051 μmol/h/g), which is 32.1, 2.0, 14.4, and 1.4-folds greater than that of In2S3, Zn3In2S6, VS-In2S3, and Vs-Zn3In2S6, respectively. In addition, the 20Vs-ISZIS6 heterojunction possessed the optimum concentration of H2O2 production with reaching 256.4 μM under 2 h of visible-light irradiation. The boosted photocatalytic performances might be caused by the synergistic effect of the presence of Vs and the construction of heterostructure between Vs-In2S3 and Vs-Zn3In2S6, leading to the increasing visible-light absorption and promoting the photogenerated carriers separation efficiency. As a result, the possible mechanism of improved photocatalytic performances of the Vs-ISZIS6 heterojunctions was proposed. This work offers an available avenue for developing of nanostructured heterojunctions for sustainable solar-to-chemical fuel conversion.

Suggested Citation

  • Zhang, Shengqu & Liu, Enli & Liu, Jiaxing & Feng, Xintao & Jian, Yaping & Jiang, Yinhua & Hong, Yuanzhi, 2026. "Rational engineering bifunctional In2S3/Zn3In2S6 heterojunctions with double sulfur vacancies for efficient solar-driven photocatalytic H2 and H2O2 generation," Renewable Energy, Elsevier, vol. 263(C).
    • Handle: RePEc:eee:renene:v:263:y:2026:i:c:s0960148126003423
    DOI: 10.1016/j.renene.2026.125517
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