Transport properties of Nafion® membranes in concentrated solution environments

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DOIResolve DOI: http://doi.org/10.1149/1.2123797
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TypeArticle
Journal titleJournal of The Electrochemical Society
ISSN0013-4651
Volume129
Issue1
Pages8589
Subjectmembranes; transport processes; polymer films; ion exchange; chemical equilibrium; sorption; osmosis; current efficiency; ion exchange; electrolysis
AbstractThe transport properties of perfluorinated cation exchange membranes in chlor‐alkali cell solution environments have been studied using a newly designed membrane test cell. A radiotracer‐weight method was used to measure sodium ion and water transport numbers for two Nafion® perfluorosulfonate membranes. A homogeneous film shows rapidly decreasing sodium ion transport numbers with increasing Formula catholyte concentration, reaching a value of 0.56 mol F−1 with 12.5M solution at 80°C. A fabric‐backed material with a sulfonamide exchange site layer yields considerably higher values with a more complicated concentration dependence. Water transport numbers for the latter membrane are also higher; a value of about 3 mol F−1 is found for typical experiments in which the anolyte solution is Formula . Results are discussed in terms of the mechanism of ionic membrane transport in relation to polymer water and electrolyte sorption.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number23001337
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Record identifier9ca50f7e-5776-4103-bdb1-b6cbe37b62dd
Record created2017-01-19
Record modified2017-01-19
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