Ultrathin TiO2/BiVO4 nanosheet heterojunction arrays modified with NiFe-LDH nanoparticles for enhanced photoelectrochemical oxidation of water.

Herein, we have constructed NiFe-LDH nanoparticles modified ultrathin TiO2/BiVO4 nanosheet heterojunction arrays and explored the effects of different NiFe-LDH loading amount on photoelectrochemical water oxidation performance. The photocurrent of as-prepared TiO2/BiVO4/NiFe-LDH photoanode is about 2.5 times than that of TiO2/BiVO4, which is ascribed to the synergistic effect of heterojunction and co-catalyst. The heterojunction between TiO2 and BiVO4 suppresses the recombination of photogenerated electron-hole pairs effectively and the co-catalyst of NiFe-LDH accelerates the surface water oxidation reaction kinetics.