【摘 要】
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Benzil,1,2-diphenylethane-1,2-dione,was used as an excellent electrocatalyst for reduction of carbon dioxide,CO2.The reduction overpotential of CO2 was reduced about 900 mV in the presence of a benzil mediator.The chemical reaction of the product of the e
【机 构】
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Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195-741, Iran
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Benzil,1,2-diphenylethane-1,2-dione,was used as an excellent electrocatalyst for reduction of carbon dioxide,CO2.The reduction overpotential of CO2 was reduced about 900 mV in the presence of a benzil mediator.The chemical reaction of the product of the electrocatalytic reduction of CO2,(activated CO2,CO2·-) with pyridine at a glassy carbon electrode,CCE,surface and in an acetonitdle-But4NClO4 solu-tion was investigated by cyclic voltammetry,chronoamperometry and controlled potential coulometry.By chronoamperometry,the catalytic rate constant,k,for the electron transfer between benzil and CO2 was obtained as 8.1 ± 0.4 M-1 s-1.The results indicate that pyridine has a strong interaction with the activated CO2.The coulometry method was used to obtain the product of the pyridine chemical reaction with CO2·-.The spectral characterizations of FTIR,1H and 13C NMR of the coulometry experiment product proved that the pyridine anion radical,Py·-,was carboxylated by CO2·-,and isonicotinic acid is the final major product.
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