Publication date: 21st July 2025
Electrochemical CO₂ reduction reaction (CO₂RR) presents a promising strategy to mitigate CO₂ emissions, enable carbon recycling, and synthesize high-value multi-carbon products for long-term renewable energy storage. Among various electrocatalysts, copper-based materials are extensively studied due to their unique capability to promote carbon–carbon (C–C) bond formation, which is essential for generating C2+ compounds. Tandem catalysis, which combines different active sites to facilitate sequential reaction steps, offers an efficient route to reduce energy barriers and simplify reaction pathways. In this study, CuAg tandem catalyst was reported to enhance electrocatalytic CO₂RR. The CuAg catalyst with 10 atomic percent silver (denoted as CuAg₁) demonstrated a high Faradaic efficiency of 50% for C2+ products at approximately 3V cell voltage in MEA system. Furthermore, when evaluated in a flow cell, CuAg₁ achieved an even higher Faradaic efficiency of 55% for C2+ products at a current density of –100 mA/cm². These results underscore the potential of CuAg as a robust and versatile catalyst suitable for a wide range of pH conditions.
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