Analysis of Nafion® Fuel Cell Membrane Chemical Durability Using Broadband Dielectric Spectroscopy
Document Type
Conference Proceeding
Publication Date
12-1-2011
School
Polymer Science and Engineering
Abstract
Changes in macromolecular dynamics associated with the T g - related β relaxation of Nafion®, with chemical degradation, were investigated using broadband dielectric spectroscopy. Loss permittivity vs. frequency spectra showed peak splitting reflecting microstructural heterogeneity. Spectra were analyzed using the conductivity-modified Havriliak-Negami equation and the Kramers-Krönig integral transform, both of which showed broadening and peak splitting for degraded samples. Peak broadening and bi and tri-modal character of the spectra of degraded samples was also manifest in distributions of relaxation times which reflected a broadening of molecular weight distribution and related microstructural heterogeneity induced by chemical degradation. © 2011 ECS - The Electrochemical Society.
Publication Title
ECS Transactions
Volume
41
Issue
1
First Page
1359
Last Page
1370
Recommended Citation
Hassan, M.,
Nalawade, A.,
Abukmail, A.,
Patil, Y.,
Mauritz, K.
(2011). Analysis of Nafion® Fuel Cell Membrane Chemical Durability Using Broadband Dielectric Spectroscopy. ECS Transactions, 41(1), 1359-1370.
Available at: https://aquila.usm.edu/fac_pubs/21174