Journal article
Cyclic Voltammetry as a Probe of Selective Ion Transport within Layered, Electrode-Supported Ion-Exchange Membrane Materials
Journal of the Electrochemical Society, Vol.169(2), 026520
02/16/2022
DOI: 10.1149/1945-7111/ac51fd
Abstract
Cyclic voltammetry was applied to investigate the permselective properties of electrode-supported ion-exchange polymer films intended for use in future molecular-scale spectroscopic studies of bipolar membranes. The ability of thin ionomer film assemblies to exclude mobile ions charged similarly to the polymer (co-ions) and accumulate ions charged opposite to the polymer (counterions) was scrutinized through use of the diffusible redox probe molecules [Ru(NH3)6]3+ and [IrCl6]2−. With the anion exchange membrane (AEM) phase supported on a carbon disk electrode, bipolar junctions formed by addition of a cation exchange membrane (CEM) overlayer demonstrated high selectivity toward redox ion extraction and exclusion. For junctions formed using a Fumion® AEM phase and a Nafion® overlayer, [IrCl6]2− ions exchanged into Fumion® prior to Nafion® overcoating remained entrapped and the Fumion® excluded [Ru(NH3)6]3+ ions for durability testing periods of more than 20 h under conditions of interest for eventual in situ spectral measurements. Experiments with the Sustainion® anion exchange ionomer uncovered evidence for [IrCl6]2− ion coordination to pendant imidazolium groups on the polymer. A cyclic voltammetric method for estimation of the effective diffusion coefficient and equilibrium extraction constant for redox active probe ions within inert, uniform density electrode-supported thin films was applied to examine charge transport mechanisms.
Details
- Title: Subtitle
- Cyclic Voltammetry as a Probe of Selective Ion Transport within Layered, Electrode-Supported Ion-Exchange Membrane Materials
- Creators
- Jiahe Xu - Texas Tech University Department of Chemistry and Biochemistry, Lubbock, Texas 79409, United States of AmericaJohna Leddy - University of Iowa Department of Chemistry, Iowa City, Iowa 52242, United States of AmericaCarol Korzeniewski - Texas Tech University Department of Chemistry and Biochemistry, Lubbock, Texas 79409, United States of America
- Resource Type
- Journal article
- Publication Details
- Journal of the Electrochemical Society, Vol.169(2), 026520
- DOI
- 10.1149/1945-7111/ac51fd
- ISSN
- 0013-4651
- eISSN
- 1945-7111
- Publisher
- IOP Publishing
- Number of pages
- 6
- Grant note
- CBET-1922956 / Division of Chemical, Bioengineering, Environmental, and Transport Systems (https://doi.org/10.13039/100000146) DBI-0421032 / National Science Foundation (https://doi.org/10.13039/100000001)
- Language
- English
- Date published
- 02/16/2022
- Academic Unit
- Chemistry
- Record Identifier
- 9984221731002771
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