Photocatalytic CO2 reduction performance of Z-scheme Ag-Cu2O/BiVO4 photocatalyst
A Z-scheme heterojunction photocatalyst Ag-Cu2O/BiVO4 was successfully constructed with effective charge carrier separation/transfer by uniformly encapsulating Cu2O nanospheres and Ag nanoparticles on the sur-face of decahedral BiVO4 using a simple chemical reduction deposition strategy.The photo-reduction of carbon diox-ide reaction result indicated that the as-prepared Ag-Cu2O/BiVO4 heterostructure exhibited excellent activity of photo-reduction CO2 with the CO yield of 5.37 μmol·g-1·h-1,about 35.8 times and 6.25 times of original BiVO4 and Cu2O,respectively.Ag-Cu2O/BiVO4 was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),UV-Vis diffuse reflec-tance absorption spectra(UV-Vis DRS),photoluminescence(PL)spectra,transient photocurrent responses(TPC),and electrochemical impedance spectroscopy(EIS),and the possible reaction mechanism for the reduction of CO2 in the photocatalytic system was proposed.
Ag-Cu2O/BiVO4Z-scheme heterojunctionphotocatalytic CO2 reductionvisible light irradiation
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