Limiting currents and sodium transport numbers in nafion membranes

An improved method to determine limiting currents IL in cation exchange membranes based on the use of a microhole array attached onto the membrane surface is applied to the Nafion® 117 membrane in dilute aqueous NaCl solutions. The values for IL obtained from the current—voltage curves are used to e...

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Bibliographic Details
Published in:Electrochimica acta 1994-07, Vol.39 (7), p.883-888
Main Authors: Kontturi, Kyösti, Mafé, Salvador, Manzanares, José A., Murtomäki, Lasse, Viinikka, Pasi
Format: Article
Language:English
Subjects:
cation transport numbers
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
limiting current conditions
membrane selectivity
microhole array
Nafion® membrane
Study of interfaces
Transport phenomena
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Summary:An improved method to determine limiting currents IL in cation exchange membranes based on the use of a microhole array attached onto the membrane surface is applied to the Nafion® 117 membrane in dilute aqueous NaCl solutions. The values for IL obtained from the current—voltage curves are used to estimate the cation transport numbers ts1 corresponding to the membrane operating under limiting current conditions. The changes of ts1 with the NaCl concentration give some insights into the membrane selectivity, and cannot be described by the conventional Donnan theory for charged membranes. Instead, a two phase model accounting for different conductive phases in the membrane is able to describe the experimental trends.
ISSN:0013-4686
1873-3859
DOI:10.1016/0013-4686(94)85102-6