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.