Effect of graphene size on photocatalytic performance of ZnIn2S4/graphene for hydrogen evolution under visible light

Different graphene size can affect the catalytic activity of the photocatalyst. In this work, a series of ZnIn2S4/graphene catalysts with different graphene sizes were synthesized, characterized and their photocatalytic activities were evaluated by photocatalytic hydrogen evolution. The different sizes (k) of graphene can be separated by differential centrifugation, with the decrease of graphene size, the activity of hydrogen production of the catalyst under visible light increases first and then decreases, when k = 5–7 μm, the maximum hydrogen production rate was 40.85 μmol/g·h. Furthermore, the relationship between the photocatalytic hydrogen production activity of ZnIn2S4/graphene and its physicochemical properties were further analyzed.