Perspectives on Cu–Ag Bimetallic Catalysts for Electrochemical CO2 Reduction Reaction: A Mini-Review

The atmospheric CO2 concentration has increased significantly since the Industrial Revolution, leading to various environmental issues and energy crisis. The electrochemical reduction of CO2 powered by renewable energy is attracting widespread attention, due to its capacity to transform CO2 into value-added chemicals and fuels and contribute to carbon neutrality. Among Cu-based catalysts, Cu–Ag bimetallic catalysts exhibit superior selectivity for high value-added multicarbon compounds. This mini-review provides an overview of Cu–Ag bimetallic catalysts including alloy system and composite structure system, emphasizing the relationship between catalysts' structure and the influencing factors for the enhanced selectivity toward C2+. At the end of this review, we outline the challenges and perspectives for the better development of electrochemical CO2 reduction by Cu–Ag bimetallic catalysts.