Title
Membrane Degradation Mechanisms In Pemfcs
Abstract
Based on experimental findings it is suggested that formation of active oxygen species from H2O2 decomposition or the direct formation of active oxygen species in the oxygen reduction reaction are not the dominating membrane degradation mechanisms in PEMFCs, instead it is the molecular H2 and O2 that react on the surface of the Pt catalyst to form the membrane degrading species. The source of H2or O2 is from reactant crossover through the membrane. The reaction mechanism is chemical in nature and depends upon the catalyst surface properties and the relative concentrations of H2 and O2 at the catalyst. The membrane degradation rate also depends on the residence time of the species in the membrane and the volume of the membrane. The sulfonic acid groups in the Nation® side chain are key to the mechanism by which the radical species attack the polymer. copyright The Electrochemical Society.
Publication Date
1-1-2006
Publication Title
ECS Transactions
Volume
3
Issue
1
Number of Pages
507-517
Document Type
Article; Proceedings Paper
Personal Identifier
scopus
DOI Link
https://doi.org/10.1149/1.2356172
Copyright Status
Unknown
Socpus ID
33846941510 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/33846941510
STARS Citation
Mittal, Vishal O.; Kunz, H. Russell; and Fenton, James M., "Membrane Degradation Mechanisms In Pemfcs" (2006). Scopus Export 2000s. 9116.
https://stars.library.ucf.edu/scopus2000/9116