首页|Combined effects of sea urchin-like structure and mixed Cu+/Cu0 states on promoting C2 formation in electrocatalytic CO2 reduction
Combined effects of sea urchin-like structure and mixed Cu+/Cu0 states on promoting C2 formation in electrocatalytic CO2 reduction
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Surface engineering and Cu valence regulation are essential factors in improving the C2 selectivity during the electrochemical reduction of CO2.Herein,we present a sea urchin-like CuO/Cu2O catalyst derived from rhombic dodecahedra Cu2O through one-step oxidation/etching method where the mixed Cu+/Cu0 states are formed via in situ reduction during electrocatalysis.The combined effects of the morphology and the mixed Cu+/Cu0 states on C-C coupling are evaluated by the Faradaic efficiency of C2 and the C2/Cl ratio obtained in an H-cell.R-CuO/Cu2O exhibited 49.5％Faradaic efficiency of C2 with a C2/C1 ratio of 3.1 at-1.4 V vs.reversible hydrogen electrode,which are 1.5 and 3.2 times higher than those of R-Cu2O,respectively.Using a flow-ceu,68.0％Faradaic efficiency of C2 is achieved at a current density of 500 mA·cm-2.The formation of the mixed Cu+/Cu0 states was confirmed by in situ Raman spectra.Additionally,the sea urchin-like structure provides more active sites and enables faster electron transfer.As a result,the excellent C2 production on R-CuO/Cu2O is primarily attributed to the synergistic effects of the sea urchinlike structure and the stable mixed Cu+/Cu0 states.Therefore,this work presents an integrated strategy for developing Cu-based electrocatalysts for C2 production through electrochemical CO2 reduction.
CO2 electrolysissea urchin-like structureCu+/Cu0C2 products
Mengqing Shan、Dongsheng Lu、Jiatong Dong、Shen Yan、Jinyu Han、Hua Wang
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Collaborative Innovation Center of Chemical Science and Engineering,Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300354,China
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