Recent Advances in the Hydrogen Evolution Reaction of ZnxCd1−xS‐Based Photocatalysts

Efficient solar‐to‐hydrogen (STH) conversion through water splitting relies on the development of low‐cost photocatalysts with high photoactivity and stability. Zn x Cd 1− x S, an emerging metal sulfide (MS) solid solution for STH, possesses several unique advantages, such as a tunable bandgap, abundant elemental constituents, and high stability. Although Zn x Cd 1− x S‐based photocatalysts are investigated for hydrogen evolution, their photoactivity still has to be enhanced for commercial applications. Herein, the design concept, crystal and band structure properties, and original photoactivity of Zn x Cd 1− x S are briefly introduced, and Zn x Cd 1− x S solutions with different morphologies and structures, modifications, synthesis methods, and vacancy engineering are then discussed. Subsequently, the combination of Zn x Cd 1− x S and cocatalysts and several representative Zn x Cd 1− x S‐based heterojunction photocatalysts for hydrogen evolution are reviewed and discussed in detail. Finally, the unsolved issues in the application of Zn x Cd 1− x S photocatalysts and their potential solutions for developing advanced Zn x Cd 1− x S‐based photocatalysts are discussed.