One-Step Electrodeposition of Cu-Sn Alloy Catalysts for Efficient Electroreduction of CO2 to Formate

• • The Cu-Sn alloy catalyst achieves a maximum Faradaic efficiency of 80% for formate production, outperforming pure Cu and Sn electrodes, which is critical for industrial viability where high selectivity directly reduces downstream separation costs. • • The catalyst maintains >70% Faradaic efficiency across a wide potential window (-1.7 V to -2.0 V vs. Ag/AgCl), offering operational flexibility and robustness against potential fluctuations in renewable energy-powered electrolyzers. • • The one-step electrodeposition method is simple, green, and scalable, potentially lowering manufacturing costs compared to multi-step or high-temperature synthesis routes, thus addressing economic barriers to commercial CO2RR deployment. • • The wheat-ear-like dendritic structure provides abundant active sites, enhancing CO2 adsorption and reaction kinetics, as evidenced by higher current densities and stability in chronoamperometric tests, which is essential for achieving industrially relevant production rates.