Visible light-induced photocatalysts with reductive energy storage abilities

Reductive energy from visible light-responsive Au–TiO2 photocatalyst, which is based on plasmon resonance absorption of Au nanoparticles, can be stored in WO3 as a reductive energy storage material. About 60% of the charge stored in WO3 is consumed on the WO3 and the other 40% is on the Au–TiO2 by reduction of ambient O2. Electrochemically pretreated MoO3 can also be used as an energy storage material.