Isolated Tin Enhanced CO Coverage‐Regulation on Sn 1 Cu Alloy for Selective CO 2 Electroreduction to C 2+ Products

Abstract Electricity‐powered C─C coupling of CO 2 represents an attractive strategy for producing valuable commodity chemicals with renewable energy, but it is still challenging to gain high C 2+ selectivity at high current density. Here, a Sn 1 Cu single‐atom alloy (SAA) is reported with isolated Sn atom embedded into the Cu lattice, as efficient ectrocatalyst for CO 2 reduction. The as prepared Sn 1 Cu‐SAA catalyst shows a maximal C 2+ Faradaic efficiency of 79.3% at 800 mA cm −2 , which can be kept stable for at least 16 h. The combination of in situ spectroscopy and DFT calculation reveal that the introduced Sn atom promote the activation of CO 2 to * CO, and enhance the CO coverage on Sn 1 Cu‐SAA. As results, the reaction barrier of C─C coupling pathway is significantly reduced, boosting the generation of C 2+ products. These findings offer a novel sight for fabricating multicarbon products from CO 2 via regulation the concentration of intermediates on catalytic interface.