Electrochemical Reduction of CO2 on Flame Annealed Cu. Issue 12 (22nd March 2021)

• Record Type: Journal Article
• Authors: Keerthiga, Gopalram; Chetty, Raghuram
• Is Part Of: ChemistrySelect. Volume 6:Issue 12(2021)
• Page Start: 2887
• Page End: 2892
• Publication Date: 2021-03-22
• Subjects: Electrochemical CO2 reduction -- Flame annealing -- Hydrocarbons -- Oxide derived copper; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202100235
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Surface modification of metallic Cu by conventional oxidation and an alternative method of oxidation using flame annealing and its influence on electrochemical reduction (ECR) of CO2 are reported in this study. The ECR of CO2 in aqueous KCl electrolyte yielded methane, ethane, ethylene, and hydrogen as the major products. The faradaic efficiency of ethane obtained at −1.2 V vs NHE for flame‐annealed Cu (34 %) was comparable to the conventionally oxidised Cu (40 %), while bare Cu yielded methane (10 %). The metal–metal oxide interface on the electrode aids in the formation of C2 ‐based products. Flame annealing can be regarded as an alternative electrode preparation method for C2 product formation, with its merits in high specific surface area, self‐rejuvenating mode on deactivation and ease of preparation. Abstract : Electrochemical CO2 reduction on oxide‐derived Cu by flame annealing yielded ethane and ethylene as the major products. Faradic efficiency and products similar to that of conventional oven oxidized electrode were obtained. The significance of the metal/metal‐oxide interface for product selectivity is illustrated.