Relationship between ionic conductivity of perfluorinated ionomeric membranes and nonaqueous solvent properties |
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| Affiliation: | 1. DuPont i Technologies, Barley Mill Plaza 24/1156, Wilmington, DE 19880-0024, USA;2. DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880-0262, USA;3. Department of Chemical Engineering, Auburn University, Auburn, AL 36849-5127, USA;4. Chemical Engineering Department, School of Engineering, University of Florida, Gainesville, FL 32611, USA;1. School of Renewable Energy, North China Electric Power University, Beijing 102206, PR China;2. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China;3. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, PR China;1. Council of Scientific and Industrial Research-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Bhavnagar 364002, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India |
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| Abstract: | Ionic conductivity and swelling data are measured for Nafion® perfluorinated ionomeric membranes in nonaqueous solvents and solvent mixtures and correlated with solvent physical properties. The dependence of ionic conductivity on solvent uptake and cation type is examined for Nafion® 117 membranes with a nominal equivalent weight of 1100 g/eq. The most important factors determining ionic conductivity in membranes swollen with polar nonaqueous solvents are the solvent viscosity, molar volume, donor properties, and the solvent uptake by the membrane. Ionic conductivity is generally limited by dissociation of the cation from the fixed anion site indicating that the ionomer fixed anion site basicity is the critical membrane property. Means for increasing membrane ionic conductivity are discussed. |
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