Optimizing CO Coverage on Rough Copper Electrodes: Effect of the Partial Pressure of CO and Electrolyte Anions (pH) on Selectivity toward Ethylene.

ABSTRACT: The conversion of the initial intermediate CO in the electrochemical reduction reaction of CO₂ on the surface of oxide-derived Cu electrodes has been investigated as a function of partial pressure and pH, manipulated by the composition of the electrolyte. We show that in inert gas, an increase in partial pressure of CO results in a continuous increase in Faradaic efficiency (FE) for ethylene, at various potentials ranging from -0.7 to -1.1 V versus RHE, with the highest FE of ∼28% obtained using 1 bar CO at -0.8 V. When the partial pressure of CO is increased in a mixture of CO and CO₂, an optimum in the ethylene FE was found for the partial pressure of CO in the range from 0.5 bar (at -1.1 V, FE is ∼45%) to 0.8 bar (at -0.9 V, FE is ∼35%). At lower negative potential

SUBMITTER: Moradzaman M 

PROVIDER: S-EPMC8020831 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature