1. Insight into the Formation and Transfer Process of the First Intermediate of CO2Reduction over Ag‐Decorated Dendritic Cu
- Author
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Xiuzhen Zheng, Yang Yang, Kejian Li, Liwu Zhang, Saira Ajmal, and Yiqing Feng
- Subjects
010405 organic chemistry ,Chemistry ,Organic Chemistry ,General Chemistry ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Ion ,Reduction (complexity) ,chemistry.chemical_compound ,Scientific method ,Atom ,Electrode ,Carboxylate ,Faraday efficiency - 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 C2 H4 (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. more...
- Published
- 2019
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