Hydrogenated TiO2/ZnO heterojunction nanorod arrays with enhanced performance for photoelectrochemical water splitting

Novel hydrogenated TiO2/ZnO heterojunction nanorod arrays as photoanodes for efficient photoelectrochemical cells are investigated in this paper. A facial solution coating method is used to prepare the heterojunction structure and then hydrogenated heterojunction is obtained by annealed in hydrogen atmosphere. The enhanced optical absorption is observed for the hydrogenated TiO2/ZnO heterojunction. The hydrogenated TiO2/ZnO heterojunction yields improved photocurrent density, which is higher than pure TiO2 nanorods and TiO2/ZnO heterojunction. The ability to gain excellent photoelectrochemical properties with hydrogenated TiO2/ZnO heterojunction nanorod arrays may provide a promising route for high performance photoelectrochemical cells.