Solid-phase synthesis of ultra-small CuMo solid solution alloy for efficient electroreduction CO 2 -to-C 2+ production.

We report a fascinating solid-phase synthesis of ultra-small CuMo solid solution alloy nanoclusters (2.1 nm) anchored on electrospun carbon nanofibers (CuMo/CNFs). By tuning the weight ratio of Cu and Mo, the optimized Cu 2 Mo 1 /CNFs achieves excellent CO 2 RR performance with a high faradaic efficiency (FE) of 84.5% for C 2+ products and an FE ethanol of 75.7%. In situ characterization demonstrates that the Cu 2 Mo 1 alloy can strengthen the adsorption of the crucial intermediate and promote C-C coupling, leading to high selectivity and efficiency for C 2+ products.