1. Insight into the Formation and Transfer Process of the First Intermediate of CO2 Reduction over Ag-Decorated Dendritic Cu.
- Author
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Yang Yang, Saira Ajmal, Yiqing Feng, Kejian Li, Xiuzhen Zheng, and Liwu Zhang
- Subjects
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CARBOXYLATES , *RAMAN spectroscopy , *CARBON dioxide reduction , *ELECTRODES , *ROTATIONAL motion , *INSIGHT - 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 Agdecorated Cu. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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