Electrochemical conversion of CO₂ and CH₄ at subzero temperatures

By taking advantage of the high solubility of CO₂ and CH₄ at low temperature, we report the electrochemical conversion of these gases in aqueous media down to −40 °C. The 5-fold increase in the concentration of CH₄ in gas hydrate slurries makes its electrochemical oxidation feasible at temperatures below the freezing point of water. We also report the electrochemical conversion of CO₂ at low temperatures and demonstrate, unexpectedly, that its reduction in these conditions follows an anti-Arrhenius kinetics electrochemical environment. These findings open windows of investigation into electrocatalysis in brines below the freezing point of water.