MOF-derived CoS_x and microspherical ZnIn₂ S₄ with enhanced photocatalytic hydrogeneration activity

The design and preparation of highly effective semiconductor-based photocatalysts is an important issue for water splitting hydrogen generation. Based on design principle of Z-scheme heterojunction, a novel ZnIn₂S₄/CoS_x photocatalyst for efficient carrier separation and transition is developed. The ZnIn₂S₄ exhibits a 3D flower-like microsphere structure, and ZIF-67-derived dodecahedral CoS_x nanospheres are tightly embedded in the ZnIn₂S₄ petals’ gaps. This design allows for fast charge separation and transfer improving the hydrogen generation reaction efficiency considerably. The ZnIn₂S₄/CoS_x heterostructure photocatalyst has high photoactivity under visible light irradiation with a hydrogen-producing rate of more than 8 mmol g^-1 h^-1, which is about 6-fold of the pristine ZnIn₂S₄.