Living Atomically Dispersed Cu Ultrathin TiO 2 Nanosheet CO 2 Reduction Photocatalyst

Abstract Supported atomically dispersed metals are proving to be efficacious photocatalysts for CO 2 reduction to solar fuels. While being atom efficient, they suffer from being noble, rare, and costly (Pt, Pd, Au, Ag, Rh) and lacking in long‐term stability. Herein, all of these problems are solved with the discovery that atomically dispersed Cu supported on ultrathin TiO 2 nanosheets can photocatalytically reduce an aqueous solution of CO 2 to CO. The atomically dispersed Cu can be recycled in a straightforward procedure when they become oxidatively deactivated. This advance bodes well for the development of a solar fuels technology founded on abundant, low‐cost, nontoxic, atomically dispersed metal photocatalysts.