Silver modified copper foam electrodes for enhanced reduction of CO2 to C2+ products. Issue 12 (23rd May 2022)

• Record Type: Journal Article
• Authors: Wang, Chong; Wang, Chengdeng; Xiong, Zhihao; Wang, Jiashuai; Zhang, Wenyuan; Shi, Haofeng; Wang, Donghua; Gu, Yousong; Bai, Zhiming; Gao, Yan; Yan, Xiaoqin
• Is Part Of: Materials advances. Volume 3:Issue 12(2022)
• Page Start: 4964
• Page End: 4972
• Publication Date: 2022-05-23
• Subjects: 620.11
• DOI: 10.1039/d2ma00188h
• Languages: English
• ISSNs: 2633-5409

Abstract

Abstract : Here we report an Ag-modified Cu/CuO (Cu/CuO–Ag) catalyst with a porous 3D structure, which can efficiently electrochemically reduce CO2 to ethylene and other C2+ products. Abstract : Electrochemical CO2 reduction reactions (CO2 RRs) have been recognized as a promising solution to environmental and energy problems due to their ability to convert intermittent renewable electricity into hydrocarbon fuels and value-added chemicals. Copper has a unique ability to electrochemically reduce CO2 to produce C2+ hydrocarbon products compared to other metals. However, it is still suffering from low Faraday efficiency (FE) limitations for specific products. Herein, we have prepared an Ag-modified Cu/CuO–Ag catalyst with a porous structure via a galvanic replacement reaction method, which reduced CO2 to C2+ products with the FE of 52.5% at −1.1 V ( vs. RHE). The experimental results and density functional theory (DFT) calculations show that the addition of Ag in Cu is beneficial to increasing the coverage of *CO on the Cu surface, which can decrease the potential barrier energy of the C–C coupling reaction and favor the generation of C2+ products. The results of this study may be helpful to the design of efficient tandem catalysts for electrochemical CO2 reduction.