Bimetallic atomic site catalysts for CO2 reduction reactions: a review

Carbon neutral becomes one of the most important environmental goals due to the excessive emission of CO2. The reduction of CO2 into valuable chemicals or fuels is one of the important strategies to solve the carbon cycle and achieve carbon neutral. Atomic site catalysts show high activity and selectivity in CO2 reduction reactions. However, due to the complexity of the multistep CO2 reduction reaction, it is difficult for an isolated atomic site to achieve multi-functional requirements. Bimetallic atomic site catalysts can take advantage of the high activity and selectivity of atomic sites, and the synergies between bimetallic atomic sites can fully optimize the CO2 reduction reactions. In this review, firstly, we summarize the design considerations of catalysts for CO2 reduction reactions. Secondly, the preparation and characterization of bimetallic atomic site catalysts are reviewed. Thirdly, the role of bimetallic atomic sites in CO2 reduction reactions was analyzed in detail.