Photocatalytic CO2 Transformation to CH4 by Ag/Pd Bimetals Supported on N-Doped TiO2 Nanosheet

To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO 2 conversion to CH 4 under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO 2 nanosheet for CO 2 conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti 3+ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO 2 reduction. It was found that CO 2 could be efficiently transformed to CH 4 under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH 4 can reach 79.0 μmol g –1 h –1 . Moreover, the Ag/Pd bimetals supported on N-doped TiO 2 nanosheet exhibit high selectivity to CH 4 . The as-synthesized photocatalyst can be well recycled for CO 2 reduction.