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Efficient electroreduction of carbon dioxide to multicarbon products in aqueous solution is of great importance and challenging. Unfortunately, the low efficiency of the production of C 2  products limits implementation at scale. Here, we report reduction of carbon dioxide to C 2  products (acetic acid and ethanol) over a 3D dendritic copper-cuprous oxide composite fabricated by in situ reduction of an electrodeposited copper complex. In potassium chloride aqueous electrolyte, the applied potential was as low as −0.4 V vs reversible hydrogen electrode, the overpotential is only 0.53 V (for acetic acid) and 0.48 V (for ethanol) with high C 2  Faradaic efficiency of 80% and a current density of 11.5 mA cm −2 . The outstanding performance of the electrode for producing the C 2  products results mainly from near zero contacting resistance between the electrocatalysts and copper substrate, abundant exposed active sites in the 3D dendritic structure and suitable copper(I)/copper(0) ratio of the electrocatalysts.

Carbon dioxide electroreduction to C2 products over copper-cuprous oxide derived from electrosynthesized copper complex