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Electrocatalytic reduction of CO 2 into multicarbon (C 2+ ) products powered by renewable electricity offers one promising method for CO 2 utilization and promotes the storage of renewable energy under an ambient environment. However, there is still a dilemma in the manufacture of valuable C 2+ products between balancing selectivity and activity. In this work, cerium oxides were combined with CuO (CeO 2 /CuO) and showed an outstanding catalytic performance for C 2+ products. The faradaic efficiency of the C 2+ products could reach 75.2% with a current density of 1.21 A cm -2 . In situ experiments and density functional theory (DFT) calculations demonstrated that the interface between CeO 2 and Cu and the subsurface Cu 2 O coexisted in CeO 2 /CuO during CO 2 RR and two competing pathways for C-C coupling were promoted separately, of which hydrogenation of *CO to *CHO is energetically favoured. In addition, the introduction of CeO 2 also enhanced water activation, which could accelerate the formation rate of *CHO. Thus, the selectivity and activity for C 2+ products over CeO 2 /CuO can be improved simultaneously.

Efficient electroreduction of CO2to C2+products on CeO2modified CuO

Efficient electroreduction of CO₂to C₂₊products on CeO₂modified CuO