Electrochemical Reduction of High Pressure Carbon Dioxide on Metal Electrodes and Gas Diffusion Electrodes

Electrochemical reduction of carbon dioxide under high pressure on Fe electrodes and a gas diffusion electrode containing Pt catalyst (Pt-GDE) had been investigated. Formic acid was formed on Fe electrode with a faradaic efficiency of 60% at a current density of 120 ㎃ ㎝^(-2) under 30 atm of CO₂. Hydrocarbons such as CH₄, C₂H_6, C₃H_6. l-C₄H_8, and n-C_5H_(12) are also formed. The distribution of hydrocarbons followed well the Schultz-Flory distribution. CH₄was formed efficiently as the main reduction product on PtGDE.