Visible light-driven photocatalytic H2-generation activity of CuS/ZnS composite particles

Abstract CuS/ZnS composite particles with diameter of 200–400 nm were successfully prepared by a simple cation-exchange reaction using ZnS spheres as a precursor. CuS nanoparticles with a few nanometers in diameter were observed on the surface of composite particles. The synthesized CuS/ZnS composite particles showed photocatalytic property effective for H 2 evolution from an aqueous Na 2 S and Na 2 SO 3 solution under visible light irradiation without any cocatalysts. The rate of H 2 generation was found to be strongly dependent on the CuS content. The highest rate of H 2 evolution reached 695.7 μmol h −1 g −1 , which was almost 7 times as high as that of the mechanical mixture of CuS and ZnS. The enhancement in the photocatalytic activity of CuS/ZnS composite particles is supposed to be due to the direct interfacial charge transfer of the CuS/ZnS heterojunction.