Abstract
A Fe2O3 nanoparticles/TiO2 array composite photoelectrode was prepared by growing Fe2O3 nanoparticles on TiO2 nanorods array by a hydrothermal method. Different concentrations of iron precursors were studied and 0.04 mol/L (4F/T) was found to possess the optimal quality. The heterojunctions between Fe2O3/TiO2 were confirmed by scanning electron microscope, transmission electron microscope and X-ray photoelectron spectroscopy. The Fe2O3 nanoparticles/TiO2 array composite photoelectrode exhibited enhanced photoelectrochemical activity under visible light irradiation. Compared to a Fe2O3 nanoparticles film electrode, it exhibited five times higher enhanced photoelectrochemical activity. Moreover, the composite photoelectrode displayed good stability for PEC measurements from the transient photocurrents of ON/OFF illumination cycles. The enhanced activity may be ascribed to the superior charge transport ability of the TiO2 nanorods array, proved by electrochemical impedance spectroscopy and Mott–Schottky analysis.
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