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In2S3/Cu2O type-II heterojunction bonded by interfacial S-O bond for enhanced charge separation and transport in photoelectrochemical water splitting

Author

Listed:
  • Wang, Zihang
  • Wang, Qi
  • Zhang, Lanlan
  • Hu, Chengwei
  • Lei, Yuanhu
  • Han, Shihao
  • Lv, Bing
  • Wang, Wenzhong

Abstract

The photoelectrochemical performance of In2S3 nanosheets as a photoanode is severely limited by the inefficiency of charge transport. To address this constraint, the photoelectrochemical performance is enhanced by fabricating the In2S3/Cu2O heterojunction through chemical bath deposition followed by vacuum annealing. Notably, the formation of a strong S-O chemical bonds at the interface between In2S3 and Cu2O after vacuum annealing treatment was revealed by X-ray photoelectron spectra and Fourier transform infrared spectroscopy analyses, leading to a significant enhancement in the photoelectrochemical performance and stability for water splitting. The type-II band structure of the In2S3/Cu2O heterojunction is confirmed using ultraviolet–visible spectrophotometry and electrochemical techniques. Under simulated sunlight irradiation with 0.75 V versus the reversible hydrogen electrode, the photocurrent density of the In2S3/Cu2O photoanode reached 177.5 μA/cm2, which is 7.4 times higher than that of the unmodified In2S3 nanosheets. Furthermore, the work function of In2S3/Cu2O heterojunction is calculated using density functional theory, demonstrating its inherent charge transfer mechanism.

Suggested Citation

  • Wang, Zihang & Wang, Qi & Zhang, Lanlan & Hu, Chengwei & Lei, Yuanhu & Han, Shihao & Lv, Bing & Wang, Wenzhong, 2025. "In2S3/Cu2O type-II heterojunction bonded by interfacial S-O bond for enhanced charge separation and transport in photoelectrochemical water splitting," Renewable Energy, Elsevier, vol. 241(C).
    • Handle: RePEc:eee:renene:v:241:y:2025:i:c:s096014812402384x
    DOI: 10.1016/j.renene.2024.122316
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