Molecular co-Corrole complex for the heterogeneous electrocatalytic reduction of carbon dioxide on carbon fiber electrodes
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Electrochemical conversion of CO2 to alcohols is one of the most challenging methods of conversion and storage of electrical energy in the form of high-energy fuels. The challenge lies in the catalyst design to enable its real-life implementation. Herein, we demonstrate the synthesis and characterization of a cobalt(III) triphenylphosphine corrole complex (Co-corrole), which contains three polyethylene glycol residues attached at the meso-phenyl groups. The Co(III) ion in the center of the 18?-electronic macrocycle is electrochemically reduced to Co(I). Herein, we report the potential dependent heterogeneous electroreduction of CO2 to ethanol or methanol of an immobilized cobalt A3-corrole catalyst system. In moderately acidic aqueous medium (pH = 6.0), the Co-corrole modified carbon paper electrode exhibits a Faradaic Efficiency (FE%) of 47 % towards ethanol production, a TON of 196 and a TOF of 0.011 s-1 at -0.8 V vs RHE over 5 hours measurement time.