Electrochemical Reduction of CO₂ on Flame Annealed Cu

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 CO 2 are reported in this study. The ECR of CO 2 in aqueous KCl electrolyte yielded methane, ethane, ethylene, and hydrogen as the major products. The faradaic efficiency of ethane obtained at À 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 C 2-based products. Flame annealing can be regarded as an alternative electrode preparation method for C 2 product formation, with its merits in high specific surface area, self-rejuvenating mode on deactivation and ease of preparation.

Bilayer Porous Electrocatalysts for Stable and Selective Electrochemical Reduction of CO2 to Formate in the Presence of Flue Gas Containing NO and SO2

“…Numerous studies have been carried out on Cu and its derivatives, including oxides, , alloys, different Cu substrates, , Cu/carbon-based materials, , and Cu used with molecular catalysts, , with the aim of enhancing CO 2 reduction activity and adjusting product selectivity. Sujet et al prepared a Cu nanofoam structure on Cu foil and observed CO 2 reduction at more positive potential compared to smooth Cu foil, with a maximum faradaic efficiency (FE) of 37% for formate achieved at −1.5 V vs Ag/AgCl.…”