Engineering a Copper Single-Atom Electron Bridge to Achieve Efficient Photocatalytic CO 2 Conversion.

Developing highly efficient and stable photocatalysts for the CO 2 reduction reaction (CO 2 RR) remains a great challenge. We designed a Z-Scheme photocatalyst with N-Cu 1 -S single-atom electron bridge (denoted as Cu-SAEB), which was used to mediate the CO 2 RR. The production of CO and O 2 over Cu-SAEB is as high as 236.0 and 120.1 μmol g -1  h -1 in the absence of sacrificial agents, respectively, outperforming most previously reported photocatalysts. Notably, the as-designed Cu-SAEB is highly stable throughout 30 reaction cycles, totaling 300 h, owing to the strengthened contact interface of Cu-SAEB, and mediated by the N-Cu 1 -S atomic structure. Experimental and theoretical calculations indicated that the SAEB greatly promoted the Z-scheme interfacial charge-transport process, thus leading to great enhancement of the photocatalytic CO 2 RR of Cu-SAEB. This work represents a promising platform for the development of highly efficient and stable photocatalysts that have potential in CO 2 conversion applications.