摘要
Benzil,1,2-diphenylethane-1,2-dione, was used as an excellent electrocatalyst for reduction of carbon dioxide, CO. The reduction overpotential of COwas reduced about 900 m V in the presence of a benzil mediator. The chemical reaction of the product of the electrocatalytic reduction of CO,(activated CO,CO) with pyridine at a glassy carbon electrode, GCE, surface and in an acetonitrile-ButNClOsolution was investigated by cyclic voltammetry, chronoamperometry and controlled potential coulometry.By chronoamperometry, the catalytic rate constant, k, for the electron transfer between benzil and COwas obtained as 8.1 ± 0.4 Ms. The results indicate that pyridine has a strong interaction with the activated CO. The coulometry method was used to obtain the product of the pyridine chemical reaction with CO. The spectral characterizations of FTIR,H andC NMR of the coulometry experiment product proved that the pyridine anion radical, Py, was carboxylated by CO, 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 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.
