期刊
CHEMICAL ENGINEERING JOURNAL
卷 353, 期 -, 页码 15-24出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.107
关键词
Photocatalytic hydrogen evolution; 2D-2D; Overpotential; Interfacial charge transfer; Ni2P; ZnIn2S4
资金
- Top Young Talents Program in University of Hebei Province [BJ2016022]
- Natural Science Foundation of Hebei Province [B2016208108]
- Scientific Research Foundation for High-Level Talent in University of Hebei Province [GCC2014057]
Promoting electron-hole separation and migration and lowering the overpotential of hydrogen evolution reactions are two effective solutions for improving photocatalytic hydrogen performance. Suitable co-catalyst and appropriate interfacial contacts can effectively lower overpotential and can also construct an electric field at the interface to increase the separation efficiency of the carriers. In this work, we design and fabricate a 2D-2D type of Ni2P co-catalyst modified with ZnIn2S4 for boosting the performance of photocatalytic hydrogen evolution. As a co-catalyst, the 2D Ni2P nanosheets exhibit a lower overpotential and smaller charge transfer resistance in hydrogen evolution reactions, and is much improved in both respects compared to Ni2P nanoparticles. Based on this, 2D/2D Ni2P/ZnIn2S4 nanohybrids with large contact regions and shorter transmission distances of the charges were fabricated, which effectively improve the separation of photo induced carriers and the interfacial charge transfer. By taking advantage of the above features, the fabricated 2D-2D Ni2P/ZnIn(2)S(4)hybrid exhibits a superior hydrogen evolution rate of 2066 mu mol.h(-1).g(-1) under visible light irradiation, and the apparent quantum yield was 7.7% at 420 +/- 20 nm. This activity far exceeds performance of the 0D/2D Ni2P/ZnIn2S4 hybrid, and is ascribed to better charge separation and accelerated surface reactions of the Ni2P nanosheets.
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