Preparation of Cu₂ZnSnS₄-CdS composite and its application in pohotocatalytic hydrogen production

In order to improve the performance for photocatalytic hydrogen production of Cu₂ZnSnS₄, the Cu₂ZnSnS₄ photocatalytic materials were made by hydrothermal method, then Cu₂ZnSnS₄-CdS composite was made by adding Cd(CH₃COO)₂·2H₂O and Na₂S by hydrothermal method again. XRD, SEM, TEM, Raman and XPS were used to characterize the structure, morphology and the valence of elements of Cu₂ZnSnS₄-CdS composite. And the pohotocatalytic hydrogen production was test in xenon lamp. The results show that Cu₂ZnSnS₄-CdS composite is successfully prepared with better crystallization properties. The Cu₂ZnSnS₄-CdS composite is made with blocky granular and spheric particles. More than 95% of the Cd and S atoms (atomic ratio of 1:1) in the Cu₂ZnSnS₄-CdS composite surface show that the spheric particles are CdS which are grown on the furface of Cu₂ZnSnS₄. The results show that the pohotocatalytic hydrogen production of Cu₂ZnSnS₄-CdS composite is about 296.17 μmol(g·h)^-1, whitch is better than Cu₂ZnSnS₄ and CdS.