Reaction Environment Regulation for Electrocatalytic CO 2 Reduction in Acids

Abstract The electrocatalytic CO 2 reduction reaction (CO 2 RR) is a sustainable route for converting CO 2 into value‐added fuels and feedstocks, advancing a carbon‐neutral economy. The electrolyte critically influences CO 2 utilization, reaction rate and product selectivity. While typically conducted in neutral/alkaline aqueous electrolytes, the CO 2 RR faces challenges due to (bi)carbonate formation and its crossover to the anolyte, reducing efficiency and stability. Acidic media offer promise by suppressing these processes, but the low Faradaic efficiency, especially for multicarbon (C 2+ ) products, and poor electrocatalyst stability persist. The effective regulation of the reaction environment at the…