Photodecomposition of H2s to H2 over CdxIn2S4-Zn1-xIn2S4 Composite Photocatalysts

摘要

A series of CdxIn2S4-Zn1-xIn2S4 composite photocatalysts has been synthesized by hydrothermal method. The physical and photophysical properties of the CdxIn2S4-Zn1-xIn2S4 photocatalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectrum, X-ray photoelectron spectroscopy and scanning electron microscopy. CdxIn2S4-Zn1-xIn2S4 could form composite semiconductors with cubic spinel phase in agreement with CdIn2S4. The absorption edges of CdxIn2S4-Zn1-xIn2S4 were red-shifted and the band gaps energy gradually reduced with the increasing of x value in CdxIn2S4-Zn1-xIn2S4. CdxIn2S4-Zn1-xIn2S4 series photocatalysts were used in the photodecomposition of H2S to H2. The results indicated that the photocatalyst of Cd0.3In2S4-Zn0.7In2S4 exhibited the highest photocatalytic activity with the rate of H2 evolution to be 590 imol/(h?g) under visible light irradiation.