Construction of Z scheme system of ZnIn2S4/RGO/BiVO4 and its performance for hydrogen generation under visible light

A series of Z scheme systems are constructed in three ways and the photocatalytic H-2 evolution activities are evaluated under visible light irradiation. The Z scheme system can be constructed by loading ZnIn2S4 onto BiVO4. The H-2 evolution is successfully realized under the visible light without providing a sacrificial agent, and the activity is greatly improved when the graphene is acted as a solid electron mediator. The best Z scheme system of 1.0La-ZnIn2S4/1.5RGO/1.0RuO(2)/BiVO4 (1:5) is obtained. Its photocatalytic H-2 evolution activity and the A.Q.Y. reach 4.1 mu mol g(-1) h and 0.8%, respectively. Furthermore, its property is characterized by various analysis techniques, such as XRD, Raman, SEM, BET and PL, and the catalytic mechanism is also discussed. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.