Atomically Dispersed Tin in Cuprous Oxide for Enhancing *CO Coverage to Selectively Electroreduce CO2 toward C2 Products

The conversion of CO 2 into high-value chemicals using renewable electricity holds great application prospects. However, improving the selectivity toward C 2 products remains a challenge. Here, we report a Sn atomically dispersed in Cu2O matrix (Sn-Cu2O), synthesized via a facile one-pot method. The as-prepared catalyst Sn-Cu2O-0.025 displays a Faradaic efficiency of 73.2% for C2 products with ethanol accounting for 32.1% at the current density of 200 mA cm-2 . Based on in-situ FT-IR characterization, the introduction of Sn promotes the activation of CO2 to *CO and enhances the coverage of *CO. As a result, the C-C coupling accelerates the formation process of key intermediates *OCCOH and enhances the selectivity of the C2 products. This study provides insights