Isolated Tin Enhanced CO Coverage‐Regulation on Sn1Cu Alloy for Selective CO2 Electroreduction to C2+ Products

Electricity-powered C─C coupling of CO2 represents an attractive strategy for producing valuable commodity chemicals with renewable energy, but it is still challenging to gain high C2+ selectivity at high current density. Here, a Sn1Cu single-atom alloy (SAA) is reported with isolated Sn atom embedded into the Cu lattice, as efficient ectrocatalyst for CO2 reduction. The as prepared Sn1Cu-SAA catalyst shows a maximal C2+ 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 CO2 to *CO, and enhance the CO coverage on Sn1Cu-SAA. As results, the reaction barrier of C─C coupling pathway is significantly reduced, boosting the generation of C2+ products. These findings offer a novel sight for fabricating multicarbon products from CO2 via regulation the concentration of intermediates on catalytic interface.