Hydrothermal synthesis of Ti-Fe2O3 /In2O3 on the TiO2 nanotubes substrate for highly efficient photoelectrochemical water oxidation

Abstract The layers of Ti-Fe2O3/In2O3 were prepared on the TiO2 nanotubes using hydrothermal method. The obtained materials were tested as photoanodes for water oxidation under sunlight irradiation. Deposited films were characterized using scanning electron microscopy, X-ray diffraction, Raman spectroscopy, UV-Vis spectroscopy and X-ray photoelectron spectroscopy. The formation of heterojunction increases photocurrent of water oxidation at 1.0 V vs RHE to over 725 mA/cm2, while TiO2/In2O3 and TiO2/Ti-Fe2O3 exhibit only 254 and 306 mA/cm2, respectively.