Ni3Se4/ZnIn2S4 S-scheme heterojunction for efficient photocatalytic H2 evolution

Photocatalytic water splitting is sustainable technology to obtain green H2. Herein, Ni3Se4/ZnIn2S4 heterojunction was obtained through a two-step hydrothermal method. 5 wt% Ni3Se4/ZnIn2S4 exhibits the most excellent H2 evolution performance and the H2 evolution rate can achieve 38778.0 mu mol center dot g- 1 center dot h-1, which is 5.94 times higher than that of pure ZnIn2S4. Based on the center dot OH free radical capture tests, the enhanced activity is attributed to S-scheme carriers migration mechanism and the abundant Se sites in Ni3Se4 can rapidly capture H+ to produce H2 efficiently. This work expands the application of transition metal selenides in the field of photocatalysis.