Insight into the Formation and Transfer Process of the First Intermediate of CO2 Reduction over Ag-Decorated Dendritic Cu |
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Authors: | Dr Yang Yang Dr Saira Ajmal Yiqing Feng Dr Kejian Li Dr Xiuzhen Zheng Prof Liwu Zhang |
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Institution: | Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433 P. R. China |
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Abstract: | It is still poorly understood how the first intermediates of CO2 reduction are formed and converted to multi-carbon products over Cu-based electrodes. Herein, Ag is used to decorate dendritic Cu and a high Faradaic efficiency (FE) for C2H4 (25 %) is obtained on a CuAg electrode, which is about five times higher than dendritic Cu. The intermediates including *CO2−, OH groups, Cu-CO, C-O rotation, and CHx species are investigated by in situ Raman spectroscopy. This work provides spectroscopic evidence that the first intermediate of CO2 reduction on Ag-decorated Cu is carboxylate anion *CO2− bonded with the catalyst surface through the C and O atom. The formation and evolution process of the *CO2− intermediate over the applied potential are investigated in depth as well. This research contributes to a better understanding of the mechanism of CO2 reduction and multi-carbon product formation pathways over Ag-decorated Cu. |
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Keywords: | Ag-decorated Cu C2H4 carboxylate anion intermediate CO2 reduction in situ Raman spectroscopy |
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