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Protective Shield for Interfacial Cu+/Cu0 Sites Enhances Multicarbon Production Toward Electrochemical Reduction of
Yutao Lin1, Yao Yao1, Zhiwen Zhuo2
1College of Chemistry and Materials Science, Anhui Normal University, Wuhu, China.
Abstract:
The interface of Cu+/Cu0 is a promising active site for multi-carbon (C2+) products towards the electrochemical reduction of carbon dioxide (CO2RR), whereas the cathodic environment commonly destroys this site by Cu+ reduction. Herein, we introduced the acid radical of trimesic acid (BTC) by electrochemical reconstruction as a "protective shield" for the stabilization of the Cu+/Cu0 interface. The BTC-stabilized Cu+/Cu0 interface displayed a Faradaic efficiency (FE) of 86.4 ± 2.4% for C2+ products at 600 mA cm-2 towards CO2RR in neutral electrolyte, with the retention of Cu+/Cu0 interface during the reaction. Such stabilization effect by BTC shield was attributed to the preferential trapping of the *H intermediates and decreased *H-induced transfer and corrosion for Cu+. The BTC-stabilized Cu+/Cu0 interface displayed a distinct asymmetry coupling path between *CO and *COH, which lowered the energy barrier of C2+ production. This work represents a new strategy for the stabilization of interfacial Cu+/Cu0 sites towards CO2RR.
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