Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (4): 781-789.doi: 10.1007/s40242-025-5072-2

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Fabrication of Ni3S4/g-C3N4 Heterojunction for Excellent Photocatalytic H2 Evolution

MA Xinyi1,2, XING Siqian1,2, LU Minghui1,2, LIU Enzhou1,2   

  1. 1. School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an 710069, P. R. China;
    2. Shaanxi Key Laboratory for Carbon Neutral Technology, Xi'an 710069, P. R. China
  • Received:2025-04-21 Accepted:2025-06-09 Online:2025-08-01 Published:2025-07-24
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 22378326) and the Natural Science Basic Research Program of Shaanxi Province, China (No. 2023-JC-YB-115).

Abstract: Nickel-based sulfides have attracted much more interest in field of photocatalytic H2 evolution due to their potential as alternatives to noble metal-based catalysts. In this study, Ni3S4 co-catalyst was synthesized by an alkaline hydrothermal method with precise control over the optimal synthesis temperature. Subsequently, it was deposited onto the surface of g-C3N4 nanosheets using a solvent evaporation strategy to obtain 0D/2D Ni3S4/g-C3N4 composite material. The investigation reveals the optimal H2 evolution rate of 20% (mass fraction) Ni3S4/g-C3N4 reaches 17566.25 μmol·g-1·h-1 under a 300 W Xe lamp and in a 20% (volume fraction) triethanolamine (TEOA) solution, representing a 158.5-fold enhancement compared to pure g-C3N4 (110.13 μmol·g-1·h-1). It has been demonstrated that the Ni3S4 co-catalyst facilitates transfer of photogenerated electrons, thereby enhancing electrical conductivity and reducing charge transfer resistance in the Ni3S4/g-C3N4 compared to pure g-C3N4. Furthermore, the contact interface between Ni3S4 and g-C3N4 conforms to a Schottky junction, further enhancing the charge separation efficiency. Additionally, Ni3S4 exhibits the ability to adsorb OH- ions from water, increasing the effective reaction active sites, reducing the H2-releasing overpotential, and improving the H2 evolution kinetics of the system.

Key words: Ni3S4, g-C3N4, Transition metal sulfide, Hydrogen evolution reaction, Schottky junction