Role of Chemical-Mechanical Energies in Understanding Structure and Properties of Aged and Degraded Membranes

TitleRole of Chemical-Mechanical Energies in Understanding Structure and Properties of Aged and Degraded Membranes
Publication TypeJournal Article
Year of Publication2013
AuthorsKusoglu, Ahmet, and Adam Z. Weber
JournalECS Transactions
Volume50
Issue2
Pagination961 - 965
Date Published03/2013
ISSN1938-6737
Abstract

Polymer fuel-cell membranes are the core component of fuel-cells having multiple functionalities including water absorption, ionic conductivity, and mechanical support. All these functionalities are correlated via the membrane nanostructure and chemical properties. This study aims at investigating the changes in the structure-uptake relationship due to membrane degradation and ageing. We show that, after in-situ chemical degradation (i.e., OCV holds), the membrane's water uptake and water-domain spacing both decrease compared to a fresh membrane. In addition, the MEA manufacturing process is also found to alter the membrane's nanostructure and uptake behavior, which suggests that changes in the properties of bare membranes during processing and cell operation must be accounted for when analyzing and modeling cell performance. The experimental data is evaluated using an energy-balance approach to examine the correlations among domain spacing, water content, and mechanical properties for degraded membranes.

DOI10.1149/05002.0961ecst
Short TitleECS Transactions
DOI10.1149/05002.0961ecst