Enhanced photoelectrochemical water oxidation on WO3 nanoflake films by coupling with amorphous TiO2

Amorphous TiO2-coupled WO3 is of significantly enhanced photoelectrochemical water oxidation activity and stability, which can be ascribed that amorphous TiO2 passivated the surface states of WO3 nanoflakes film, and thus the formation of H2O2 from the photoexcited-electrons/dissolved-oxygen route is depressed and the photoelectrochemical oxidation of H2O2 is accelerated.344