Abstract
The electrochemical reduction of CO 2 in KOH/methanol-based electrolyte has been investigated on a lead wire electrode at ambient temperature and pressure. The major products of electrochemical reduction of CO 2 were formic acid, CO and methane. The formation of formic acid from CO 2 predominated in the potential range −1.8 to −2.5 V vs Ag/AgCl (saturated KCl). Hydrogen evolution in competition with CO 2 reduction was observed at only 3.5% faradaic efficiency. The partial current density for CO 2 reduction was more than 22 times larger than that for hydrogen evolution. Study of the Tafel plot showed that the reduction of CO 2 to formic acid and CO was not limited by mass transfer in this potential range.
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