Abstract
The electrocatalytic reduction of carbon dioxide in aqueous solution using Co [p-N(CH3)3) TPPI under pressure (4∼22 kg · cm−2) was carried out on solid-state metal electrodes such as In, Sn, Pb and Pb-Hg. The reduction products were mainly carbon monoxide and a small amounts of formic acid. The effects of the pressure of carbon dioxide, electrolytes, catalyst concentration, electrode materials and potentials on the reduction of carbon dioxide were studied. The optimum voltage for maximum current efficiency of reduction products was at −1.2 Vvs. SCE for all four kinds of metal electrodes. High current efficiencies (>90%) were obtained with lead and amalgamated lead electrodes in an aqueous solution of NaHCO3 containing 7.4 × 10×5 mol/L of catalyst.
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