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Updated: Jun 7, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Unraveling the Selectivity of Acidic CO2 Reduction in CuAg Tandem Electrocatalysts
Yi Chen1, Taiping Ye2, Zhizhong He2
1Department of Applied Physical Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514, United States.
Abstract:
Acidic electrocatalytic CO2 reduction (CO2R) offers compelling advantages in carbon efficiency and long-term stability. However, mechanistic insights into tandem electrocatalysis in acidic media remain limited due to the difficulty of resolving the coupled dynamics of intermediates at reactive interfaces. Here, we unveil a "CH4-C2+-CO" selectivity evolution across composition-graded CuAg tandem catalysts as Ag fraction increases from single-atom alloy to subnanoclusters to nanoparticle clusters. The surface composition simultaneously governs *CO intermediate binding strength and reorients the interfacial water microenvironment to direct local reaction pathways. The product selectivity of CuAg tandem catalysts is dictated by the regulation of *CO spillover from Ag to adjacent Cu domains, favoring either C-C coupling or CO desorption. Our findings establish a unified *CO/*H-centric mechanistic framework for tandem CO2R electrocatalysis in acidic media, providing compositional design principles for selective multicarbon product generation.
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