Recent Advances in the Hydrogen Evolution Reaction of Zn_xCd_1−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_xCd_1−xS, 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_xCd_1−xS‐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_xCd_1−xS are briefly introduced, and Zn_xCd_1−xS solutions with different morphologies and structures, modifications, synthesis methods, and vacancy engineering are then discussed. Subsequently, the combination of Zn_xCd_1−xS and cocatalysts and several representative Zn_xCd_1−xS‐based heterojunction photocatalysts for hydrogen evolution are reviewed and discussed in detail. Finally, the unsolved issues in the application of Zn_xCd_1−xS photocatalysts and their potential solutions for developing advanced Zn_xCd_1−xS‐based photocatalysts are discussed.