Sb-Doped CeO₂ Nanospheres for Selective CO₂ Electroreduction to Ethanol through Dynamic Redox Cycling of Surface Sb...

It is challenging to construct non-Cu catalysts toward CO₂ electroreduction (CO₂ER) to ethanol with high selectivity due to the difficulty in adjusting active sites for controlling the evolution of reaction intermediates. In this work, Sb-doped CeO₂ nanospheres are constructed to tune the reaction intermediates on the active sites toward selective ethanol generation. The primary active sites of one Sb site and two Ce sites undergo fluctuations in the oxidation states during CO₂ER, which promotes *CO*OH formation and conversion to linear *CO_L for further C-C coupling to produce ethanol. The optimal Sb_5.0%-CeO₂ nanospheres can convert CO₂ to ethanol as a single liquid product with selectivity over 50% in a broad potential range from -0.5 to -1.0 V. Remarkably, it exhibits an ethanol Faradaic efficiency of 70.5 ± 1.2% at -0.7 V with stable operation for 48 h. This work provides insights into the non-Cu catalyst design for CO₂ER to ethanol with high selectivity.