Construct Inorganic–Inorganic VS₂/ZnCdS Heterojunctions for Enhancd Photocatalytic Hydrogen Evolution

To address the issue of insufficient charge separation during photocatalytic hydrogen production, this work demonstrates the construction of an inorganic–inorganic VS2/ZnCdS ohmic heterojunction composite catalyst using the physical stirring method to advance photocatalytic hydrogen generation efficiency. Material characterization and the density functional theory (DFT) calculations have confirmed the existence of ohmic contact characteristics at the interface, which allows for the efficient and directional movement of photogenerated carriers with low resistance. Under visible light irradiation, the hydrogen evolution rate of the optimized ZCVS-15 catalyst was 9.51 mmol·g–1·h–1, which was nearly 5 times that of the original ZnCdS catalyst. After four cycles, it maintained an initial activity level of 94.52%. This remarkable stability can be attributed to the powerful interfacial electronic coupling, which effectively reduces photocorrosion. This method offers insights into building high-performance, stable photocatalytic systems through interface optimization.