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- W2605288269 abstract "Abstract The effects of mass transfer on the electrocatalytic reduction of CO 2 on a polycrystalline Cu rotating cylinder electrode were investigated. When the rotation rate was increased, the current efficiency toward CO 2 reduction products decreased while that for the hydrogen evolution reaction increased. Furthermore, the product selectivity switched from CH 4 to CO as the rotation rate was increased. This observation is generally inconsistent with the widely reported dependence of the electrocatalytic CO 2 reduction on interfacial pH and CO 2 concentration. As increasing the rotation rate improves mass transfer of species to and from the electrode surface, the interfacial pH becomes closer to the bulk pH while the interfacial concentration of CO 2 at the electrode surface increases. However, increasing the rotation rate significantly decreased the CO 2 reduction activity for constant current electrochemical CO 2 reduction despite the increased availability of CO 2 at the electrode surface. As the changes in interfacial pH and CO 2 concentration with rotation rate cannot adequately explain the results, it is instead suggested that the enhanced mass transfer of dissolved CO away from the electrode surface at high rotation rates is the main reason behind the observed effects. We propose that this enhanced mass transfer of CO away from the electrode surface decreases the surface coverage of CO ads (due to the equilibrium between CO ads and dissolved CO at the electrode-electrolyte interface) and limits the further reduction of CO ads to hydrocarbons." @default.
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- W2605288269 date "2017-06-01" @default.
- W2605288269 modified "2023-10-09" @default.
- W2605288269 title "Effects of mass transfer on the electrocatalytic CO 2 reduction on Cu" @default.
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- W2605288269 doi "https://doi.org/10.1016/j.electacta.2017.04.017" @default.
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