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Benzil,1,2-diphenylethane-1,2-dione, was used as an excellent electrocatalyst for reduction of carbon dioxide, CO_2. The reduction overpotential of CO_2 was reduced about 900 m V in the presence of a benzil mediator. The chemical reaction of the product of the electrocatalytic reduction of CO_2,(activated CO_2,CO_2~(·-)) with pyridine at a glassy carbon electrode, GCE, surface and in an acetonitrile-But_4NClO_4 solution was investigated by cyclic voltammetry, chronoamperometry and controlled potential coulometry.By chronoamperometry, the catalytic rate constant, k, for the electron transfer between benzil and CO_2 was obtained as 8.1 ± 0.4 M~(-1)s~(-1). The results indicate that pyridine has a strong interaction with the activated CO_2. The coulometry method was used to obtain the product of the pyridine chemical reaction with CO_2~(·-). The spectral characterizations of FTIR,~1H and ~(13)C NMR of the coulometry experiment product proved that the pyridine anion radical, Py~(·-), was carboxylated by CO_2~(·-), and isonicotinic acid is the final major product.
Benzil, 1,2-diphenylethane-1,2-dione, was used as an excellent electrocatalyst for reduction of carbon dioxide, CO_2. The reduction over potential of CO_2 was reduced to 900 m V in the presence of a benzil mediator. The chemical reaction of the product of the electrocatalytic reduction of CO_2, (activated CO_2, CO_2 ~ (· -)) with pyridine at a glassy carbon electrode, GCE, surface and in an acetonitrile-but_4NClO_4 solution was investigated by cyclic voltammetry, chronoamperometry and controlled potential coulometry .By chronoamperometry, the catalytic rate constant, k, for the electron transfer between benzil and CO_2 was obtained as 8.1 ± 0.4 M ~ (-1) s ~ (-1). The results indicate that pyridine has a strong interaction with the activated CO_2. The coulometry method was used to obtain the product of the pyridine chemical reaction with CO_2 ~ (. -). The spectral characterizations of FTIR, ~ 1H and ~ (13) C NMR of the coulometry experiment product proved that the pyridine anion radical , Py ~ (· -), wa s carboxylated by CO_2 ~ (-), and isonicotinic acid is the final major product.