Effects of mass transfer on the electrocatalytic {CO2} reduction on Cu
By Lim, C. F. C.; Harrington, D. A.; Marshall, A. T.
Published in Electrochimica Acta
NULL
2017
Abstract
Abstract The effects of mass transfer on the electrocatalytic reduction of {CO2} on a polycrystalline Cu rotating cylinder electrode were investigated. When the rotation rate was increased, the current efficiency toward {CO2} reduction products decreased while that for the hydrogen evolution reaction increased. Furthermore, the product selectivity switched from {CH4} to {CO} as the rotation rate was increased. This observation is generally inconsistent with the widely reported dependence of the electrocatalytic {CO2} reduction on interfacial pH and {CO2} 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 {CO2} at the electrode surface increases. However, increasing the rotation rate significantly decreased the {CO2} reduction activity for constant current electrochemical {CO2} reduction despite the increased availability of {CO2} at the electrode surface. As the changes in interfacial pH and {CO2} 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 {COads} (due to the equilibrium between {COads} and dissolved {CO} at the electrode-electrolyte interface) and limits the further reduction of {COads} to hydrocarbons.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.