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The electrocatalytic reduction of carbon dioxide in aqueous solution using Co[p-N(CH_3)_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 formicacid. The effects of the pressure of carbon dioxide, electrolytes, catalyst concentration, electrodematerials and potentials on the reduction of carbon dioxide were studied. The optimum voltagefor maximum current efficiency of reduction products was at -1.2 Vvs. SCE for all four kinds ofmetal electrodes. High current efficiencies (>90%) were obtained with lead and amalgamated leadelectrodes in an aqueous solution of NaHCO_3 containing 7.4×10~(-5) mol/L of catalyst.
The electrocatalytic reduction of carbon dioxide in aqueous solution using Co [pN (CH_3) _3] TPPI under pressure (4 ~ 22 kg · cm -2) was carried out on solid-state metal electrodes such as In, Sn, Pb The effects of the pressure of carbon dioxide, electrolytes, catalyst concentration, electrodematerials 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 ofmetal electrodes. High current efficiencies (> 90%) were obtained with lead and amalgamated leadelectrodes in an aqueous solution of NaHCO 3 containing 7.4 × 10 -5 mol / L of catalyst.