This study presents a sea urchin-like Cu2O/Cu catalyst for electrochemical CO2 reduction to C2, which is derived from rhombic dodecahedra Cu2O through one-step oxidation/etching reaction and in situ electrochemical reduction. The sea urchin-like structure provides more active sites and enhances the adsorption of the key intermediate *CO. Meanwhile the formed Cu+/Cu0 interfaces facilitate the C-C coupling reactions between C1 intermediates. As a result, the excellent C2H4 production is achieved through the combined effects of the sea urchin-like structure and the stable Cu+ /Cu0 mixed states. (Mengqing Shan, Dongsheng Lu, Jiatong Dong, Shen Yan, Jinyu Han, Hua Wang, Front. Chem. Sci. Eng. 2024, 18(3): 30)
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