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.