Construction of ZnIn2S4-RGO-BiVO4 Z-Scheme System: Influence of the RGO loading and Co-Catalysts Types

In the all-solid-state Z-scheme photocatalytic system with reduced graphene oxide (RGO) as the electronic transmission medium, an appropriate content of RGO is of great significance for the enhancement of its photocatalytic performance. In recent years, little work has been done to simultaneously study the influence of reductive co-catalysts types and oxidative co-catalysts types on the photocatalytic activity of Z-Scheme system. In this work, a series of ZnIn2S4-RGO-BiVO4 Z scheme system photocatalysts were synthesized, using Pt, Pd, Au, Ag as the reductive co-catalysts and NiO, RuO2, MnO2, IrO2, CuO, CoO as the oxidative co-catalysts, respectively, in addition controlling the content of RGO was 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.5%, 5.0%, respectively. Then, the photocatalytic activities of the Z scheme system photocatalysts in H-2 evolution were tested and the as-prepared samples were subsequently characterized by various analytical techniques. On this basis, the influence mechanisms of RGO and co-catalysts on the activity of Z scheme system for hydrogen production were explained.