Photocatalytic conversion of CO2 using K2YTa5O15 photocatalyst in the presence of silver-iron dual cocatalyst

Abstract Photocatalytic conversion of CO2 is a promising technique for realising a carbon neutral society based on the use of renewable energy sources. The application of dual cocatalysts consisting of silver-cobalt or silver-iron significantly improved the photocatalytic activity of an Al−SrTiO3 photocatalyst for the conversion of CO2 to CO in water. In this work, the photocatalytic conversion of CO2 using Ga2O3 and K2YTa5O15 photocatalysts was successfully performed in the presence of a silver-iron dual cocatalyst loaded via a photodeposition method, and the formation rate of CO and selectivity toward CO production were simultaneously increased by the addition of Fe species. The promotion of the H2O oxidation reaction through Fe addition ensures superior activity for the CO2 conversion into CO.