NiMoO<sub>4</sub>/ZnIn<sub>2</sub>S<sub>4</sub> Nanocomposite Forming a Type II Heterojunction for the Photocatalytic Production of Hydrogen
Haijing Zhang, Qianran Feng, Yueqin Zhao, Liuyun Chen, Xuan Luo, Xinling Xie, Zuzeng Qin, Hongbing Ji, Tongming Su
Abstract
The construction of heterojunctions is a critical approach for obtaining efficient photocatalysts. In this work, an efficient NiMoO 4 /ZnIn 2 S 4 heterojunctions photocatalyst was successfully synthesized and used for photocatalytic H 2 production with TEOA as scavenger. When the amount of NiMoO 4 was 5%, the NiMoO 4 /ZnIn 2 S 4 photocatalyst (5NMO/ZIS) exhibited the best performance in terms of photocatalytic H 2 production, with a H 2 production rate of 5.1 mmol g –1 h –1, which was 7.3 times greater than that of ZnIn 2 S 4 . The enhanced performance of 5NMO/ZIS in terms of photocatalytic H 2 production can be attributed to the formation of Mo–S bonds, an internal electric field, and type II heterojunctions at the interface between NiMoO 4 and ZnIn 2 S 4, which greatly increase charge carrier separation and transfer. Moreover, the introduction of NiMoO 4 enhances the absorption of light in the visible and infrared regions, which promotes the generation of more photogenerated carriers, thus further enhancing the photocatalytic H 2 production performance.