Mo-WO/ZnInS Composites Synthesized by Metal Doping for Photocatalytic Hydrogen Evolution.

Utilizing two or more semiconductor materials with distinct geometric and electronic energy arrangements at the nanoscale to construct heterostructures is an important means for developing high-performance catalysts for photocatalytic hydrogen evolution. In this study, ZnInS serves as the primary catalyst carrier, while Mo-WO functions as the cocatalyst supported on the surface of ZnInS. A series of ZnInS/Mo-WO heterojunction composite materials were synthesized through a straightforward hydrothermal method. The ZnInS/Mo-WO photocatalyst demonstrates exceptional photocatalytic hydrogen evolution activity. Notably, with a Mo-WO loading of 10%, the photocatalyst achieves optimal hydrogen evolution, yielding 2592.8 μmol g, which is 31 times greater than that of pure ZnInS. Further characterized results of the samples showed that loading Mo-WO with an appropriate mass ratio on ZnInS can increase the electron transfer rate, which facilitates reducing the recombination probability of photo-generated electrons and holes, thus improving hydrogen evolution efficiency.