Limiting currents and sodium transport numbers in nafion membranes

✍ Scribed by Kyösti Kontturi; Salvador Mafé; José A. Manzanares; Lasse Murtomäki; Pasi Viinikka

• Book ID: 103066447
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 684 KB
• Volume: 39
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)85102-6

✦ Synopsis

An improved method to determine limiting currents I, in cation exchange membranes based on the use of a microhole array attached onto the membrane surface is applied to the Nafton@ 117 membrane in dilute aqueous NaCl solutions. The values for I, obtained from the current-voltage curves are used to estimate the cation transport numbers G corresponding to the membrane operating under limiting current conditions. The changes oft; 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.