Nanostructured cobalt/copper catalysts for efficient electrochemical carbon dioxide reduction

The search for an efficient and stable catalyst for the electrochemical reduction of CO 2 to value-added chemicals is especially critical for lowering the atmospheric CO 2 concentration. In this study, self-supported cobalt/copper nanostructured catalysts were designed, where the influences of the elemental composition and acid-etching on their efficiency towards the CO 2 reduction reaction were studied. The developed Co/Cu catalysts showed superb catalytic activity with a low onset potential at −0.2 V vs. RHE. Gas and liquid product analysis revealed that formate and CO were the main products. It was observed that lower reductive potentials were favourable for formate production, while higher reductive potentials were more favourable for CO formation. In situ electrochemical FTIR studies were further conducted to gain insight into the CO 2 reduction mechanism. The novel synthetic procedure reported in this study leads to promising electrocatalysts with high efficiencies for the conversion of CO 2 into valuable products. Self-supported Co/Cu nanodendrites with high catalytic activity were designed for electrochemical reduction of CO 2 . The influences of the composition and structure on their efficiency as well as the reduction reaction mechanism were studied.