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Efficient electroreduction of CO 2  to multi-carbon products is a challenging reaction because of the high energy barriers for CO 2  activation and C–C coupling, which can be tuned by designing the metal centers and coordination environments of catalysts. Here, we design single atom copper encapsulated on N-doped porous carbon (Cu-SA/NPC) catalysts for reducing CO 2  to multi-carbon products. Acetone is identified as the major product with a Faradaic efficiency of 36.7% and a production rate of 336.1 μg h −1 . Density functional theory (DFT) calculations reveal that the coordination of Cu with four pyrrole-N atoms is the main active site and reduces the reaction free energies required for CO 2  activation and C–C coupling. The energetically favorable pathways for CH 3 COCH 3  production from CO 2  reduction are proposed and the origin of selective acetone formation on Cu-SA/NPC is clarified. This work provides insight into the rational design of efficient electrocatalysts for reducing CO 2  to multi-carbon products.

Selective electroreduction of CO2 to acetone by single copper atoms anchored on N-doped porous carbon