Dual-Site Metal Catalysts for Electrocatalytic CO Reduction Reaction.

Electrocatalytic CO reduction reaction (CO RR) is a promising and green approach for reducing atmospheric CO concentration and achieving high-valued conversion of CO under the carbon-neutral policy. In CO RR, the dual-site metal catalysts (DSMCs) have received wide attention for their ingenious design strategies, abundant active sites, and excellent catalytic performance attributed to the synergistic effect between dual-site in terms of activity, selectivity and stability, which plays a key role in catalytic reactions. This review provides a systematic summary and detailed classification of DSMCs for CO RR, describes the mechanism of synergistic effects in catalytic reactions, and also introduces in situ characterization techniques commonly used in CO RR. Finally, the main challenges and prospects of dual-site metal catalysts and even multi-site catalysts for CO recycling are analyzed. It is believed that based on the understanding of bimetallic site catalysts and synergistic effects in CO RR, well-designed high-performance, low-cost electrocatalysts are promising for achieving CO conversion, electrochemical energy conversion and storage in the future.