• Dynamic Interface Engineering via Mechanistic Understanding of Copper Reconstruction in Electrochemical CO2 Reduction Reaction
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  • 2026-03-12 10:16:24|
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ㅇ [Title]         Dynamic Interface Engineering via Mechanistic Understanding of Copper Reconstruction in Electrochemical CO2 Reduction Reaction


ㅇ [Journal]    Journal of the American Chemical Society
                                                                          

ㅇ [Author]     Hanjoo Kim,‡ Hongmin An,‡ Jinyeop Kim, Hyein Park, Chanwook Cha, Robert Haaring, Hyunjoo Lee, Koohee Han, and Dong Young Chung*
 
 
ㅇ [Abstrct]


Electrochemical CO2 reduction on copper catalysts offers a promising route to convert CO2 into various value-added chemicals. Efforts to improve C2+ selectivity in CO2 electroreduction have

increasingly focused on strategies that deliberately induce catalyst surface reconstruction to create and maintain active sites. Among these, approaches using anodic pulses have gained

particular attention for their ability to modulate the copper catalyst surface in situ. However, the underlying Cu surface reconstruction mechanisms triggered by anodic polarization still remain

unclear.


Here, we show that applying anodic potentials to copper can lead to two distinct surface reconstructions: surface oxide formation or metal dissolution, each defining a different reconstruction

pathway with contrasting impacts on product selectivity. Oxide-derived reconstruction transiently enhances C2 over C1 selectivity but gradually loses effectiveness during operation, while

dissolution–redeposition reconstruction continuously forms C2-selective sites, resulting in a progressive increase in C2 selectivity over time.


Leveraging this mechanistic understanding, we implement electrolyte engineering by introducing trace Cu2+ ions under cathodic conditions to directly activate the dissolution–redeposition

pathway without anodic bias. This strategy drives a dynamic electrochemical interface that sustains active-site regeneration and enables controllable selectivity, offering an energy-efficient

alternatives.







 
 
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