Photoelectrochemical (PEC) water splitting is a promising green technique for renewable hydrogen production. To construct a practical PEC system, it is of great significance to develop efficient photoanodes. BiVO4 has been identified as the most promising photoanode material because of its narrow band gap and favorable band positions for hydrogen and oxygen evolution. Nevertheless, BiVO4 has limitations of low carrier mobility (4×10−2 cm2·V−1·s−1) and short hole diffusion length (