Selective Electrochemical Reduction of Carbon Dioxide Using Cu Based Metal Organic Framework for CO₂ Capture

The conversion efficiency and product selectivity of the electroreduction of carbon dioxide have been largely limited by the low CO₂ solubility in aqueous solution. To relieve this problem, Cu₃(BTC)₂ (Cu-MOF) as CO₂ capture agent was introduced into a carbon paper based gas diffusion electrode (GDE) in this study. The faradaic efficiencies (FEs) of CH₄ on GDE with Cu-MOF weight ratio in the range of 7.5-10% are 2-3-fold higher than that of GDE without Cu-MOF addition under negative potentials (-2.3 to -2.5 V vs SCE), and the FE of the competitive hydrogen evolution reaction (HER) is reduced to 30%. This work paves the way to develop GDE with high catalytic activity for ERC.