Activating coordinative conjugated polymer via interfacial electron transfer for efficient CO2 electroreduction
With tunable local electronic environment, high mass density of MN 4 sites, and ease of preparation, metal–organic conjugated coordinative polymer (CCP) with inherent electronic conductivity provides a promising alternative to the well-known M−N−C electrocatalysts. Herein, the coordination reaction between Cu 2+ and 1,2,4,5-tetraaminobenzene (TAB) was conducted on the surface of metallic Cu nanowires, forming a thin layer of CuN 4 -based CCP (Cu-TAB) on the Cu nanowire. More importantly, interfacial transfer of electrons from Cu core to the CuN 4 -based CCP nanoshell was observed within the resulting CuTAB@Cu, which was found to enrich the local electronic density of the CuN 4 sites. As such, the CuTAB@Cu demonstrates much improved affinity to the *COOH intermediate formed from the rate determining step; the energy barrier for C–C coupling, which is critical to convert CO 2 into C 2 products, is also decreased. Accordingly, it delivers a current density of −9.1 mA cm −2 at a potential as high as −0.558 V (vs. RHE) in H-type cell and a Faraday efficiency of 46.4% for ethanol. This work emphasizes the profound role of interfacial interaction in tuning the local electronic structure and activating the CuN 4 -based CCPs for efficient electroreduction of CO 2 .
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