Abundant (110) Facets on PdCu 3 Alloy Promote Electrochemical Conversion of CO 2 to CO.

Electrochemical conversion of CO 2 to high-value chemical fuels offers a promising strategy for managing the global carbon balance but faces huge challenges due to the lack of effective electrocatalysts. Here, we reported PdCu 3 alloy nanoparticles with abundant exposed (110) facets supported on N-doped three-dimensional interconnected carbon frameworks (PdCu 3 /NC) as an efficient and durable electrocatalyst for electrochemical CO 2 reduction to CO. The catalyst exhibits extremely high intrinsic CO 2 reduction selectivity for CO production with a Faraday efficiency of nearly 100% at a mild potential of -0.5 V. Moreover, a rechargeable high-performance Zn-CO 2 battery with PdCu 3 /NC as a cathode is developed to deliver a record-high energy efficiency of 99.2% at 0.5 mA cm -2 and rechargeable stability of up to 133 h. Theoretical calculations elucidate that the exposed (110) facet over PdCu 3 /NC is the active center for CO 2 activation and rapid formation of the key *COOH intermediate.