Synergistic Photocatalytic CO2 Reduction on Two-dimensional TiO2 with Cu and Ru Dual Single-Atom Sites

Photocatalytic CO2 reduction offers a sunlight-driven route to convert a greenhouse gas into fuels.TiO2 has been a well-established photocatalyst, but suffers from a wide bandgap, fast charge recombination, and weak CO2 adsorption.Single-atom catalysts (SACs) address these limitations, yet dual single-atom catalysts (DSACs), pairing two distinct metal single atoms on one support, enhance the catalytic activity by increasing active sites and utilizing different metal properties.The large specific surface area of 2D TiO2 can facilitate a higher loading of atomically dispersed metal species, thereby increasing activity.We report a Cu/Ru DSAC on 2D TiO2 nanosheets that enhanced photocatalytic CO2 reduction performance and stability by abundant atomic active sites