The use of photocatalysts based on semiconductor heterostructures for hydrogen evolution is a prospective tactic for converting solar energy. Herein, visible-light-responsive three-dimensional core-shell CoSe/ZnInS heterostructures were successfully fabricated growth of ZnInS ultrathin nanosheets on spherical CoSe. Without any noble metal co-catalysts, the as-prepared CoSe/ZnInS composite achieved attractive photocatalytic hydrogen evolution activity under visible light illumination. Optimal CoSe/ZnInS achieved a hydrogen evolution rate of 2199 μmol g h, which was 7 times higher than that of pristine ZnInS and even exceeded that of ZnInS loaded with platinum. In this distinctive core-shell heterostructure, the presence of CoSe could considerably improve the ability to harvest light, quicken the charge transfer kinetics, and avoid the agglomeration of ZnInS nanosheets. Meanwhile, the experimental results demonstrated that the strong interaction between CoSe and ZnInS at the compact interface could appropriately boost the photogenerated electron-hole pair migration and relieve charge recombination, thus improving photocatalytic hydrogen evolution activity. This work has bright prospects in constructing noble-metal-free core-shell heterostructures for solar energy conversion.
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