Fabrication of CuMnO2/XMoO4 (X=Ni, Co, Fe) heterostructure for hydrogen evolution under visible light irradaiation

CuMnO2/XMoO4 (X=Ni, Co, Fe) is a novel high-efficiency photocatalyst, which was synthesized by electrostatic self-assembly method. Under visible light irradiation, by comparing with other eighth main group metals (Fe, Co), it was found by experimental study that adding 30 mg of CuMnO2 to 100 mg of NiMoO4 (CuMnO2/NiMoO4-30%), it has the best hydrogen evolution effect up to 300 μ mol, which is 1.49 and 2.88 times more effective than CuMnO2/CoMoO4 and CuMnO2/FeMoO4 respectively. Meanwhile, the hydrogen evolution yield of CuMnO2/NiMoO4 was about 4 times that of CuMnO2 and NiMoO4. The photoelectrochemical and time-resolved fluorescence experiments confirmed the excellent charge separation efficiency of the composite catalyst, and the linear voltammetry curve showed that the composite catalyst had the characteristics of high current response. When CuMnO2 is loaded on NiMoO4, CuMnO2/NiMoO4 exhibits excellent photocatalytic activity due to the formation of Type I heterojunction, which promote charge transfer and effectively improve the separation of electrons and holes. This experiment provides a simple and feasible idea for the study of composite catalysts with high catalytic activity.