Insight into the Formation and Transfer Process of the First Intermediate of CO2 Reduction over Ag‐Decorated Dendritic Cu. Issue 18 (16th October 2019)

• Record Type: Journal Article
• Authors: Yang, Yang; Ajmal, Saira; Feng, Yiqing; Li, Kejian; Zheng, Xiuzhen; Zhang, Liwu
• Is Part Of: Chemistry. Volume 26:Issue 18(2020)
• Page Start: 4080
• Page End: 4089
• Publication Date: 2019-10-16
• Subjects: Ag-decorated Cu -- C2H4 -- carboxylate anion intermediate -- CO2 reduction -- in situ Raman spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201904063
• Languages: English
• ISSNs: 0947-6539

Abstract

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 CH x 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. Abstract : Understanding CO2 electroreduction : Ag is used to decorate dendritic Cu and a high Faradaic efficiency for C2 H4 (25 %) is obtained on a CuAg electrode, which is about five times higher than dendritic Cu. The intermediates are investigated by in situ Raman spectroscopy to understand how the first intermediates of CO2 reduction are formed and converted to multi‐carbon products over Cu‐based electrodes.