Effect of Electric Field on CO2 Photoreduction by TiO2 Film

To mitigate the greenhouse effect, many studies have been carried out to improve the CO 2 conversion efficiency of TiO 2 . Modification of TiO 2 has been intensively investigated, but the influence of an electric field on photoreduction by this material remains largely unknown. Accordingly, in this study, we explored the effect of an electric field on the photoreduction process using a porous TiO 2 -Ti material. The results indicated that the CO yield improved 85-fold (equivalent to 4772  μ mol/g h) when a 30-kV voltage was applied during the reduction process. To make the electric field effect fully functional, we also explored the effect of water on the photoreduction process, finding that TiO 2 showed the highest conversion rate when the humidity was controlled at 50% relative humidity (RH).