Hybrid nanostructures of TiO2 nanorod array/Cu2O with a CH3NH3PbI3 interlayer for enhanced photocatalytic activity and photoelectrochemical performance
TiO2 nanorod arrays (NRAs) filled with CH3NH3PbI3 were coated by Cu2O, which was fabricated on carbon fiber to form the photocatalyst TiO2 NRAs/CH3NH3PbI3/Cu2O. The morphology and structure of the as-obtained samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The ultraviolet-visible (UV-vis) absorption measurements and photocurrent test revealed that the CH3NH3PbI3 layer can provide a greatly enhanced light harvesting efficiency. The I–V curves and electrochemical impedance spectra (EIS) analysis confirmed that the TiO2 NRAs/CH3NH3PbI3/Cu2O hybrid structure favors electron transfer. The TiO2 NRAs/CH3NH3PbI3/Cu2O structure exhibits enhanced photocatalytic activity with good recyclability under Xe lamp irradiation. The experimental results indicate that the better photocatalytic performance is ascribed to the higher carrier separation and transportation, higher specific surface area and the broadened absorption spectrum.