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In-Situ and Ex-Situ Characterization of PFSA-Inorganic Inclusion Composites for Medium Temperature PEM Fuel Cells


Bauer, Felix ; Müller, Achim ; Wojtkowiak, Anna ; Willert-Porada, Monika:
In-Situ and Ex-Situ Characterization of PFSA-Inorganic Inclusion Composites for Medium Temperature PEM Fuel Cells.
In: Advances in Science and Technology. Bd. 45 (Oktober 2006) . - S. 787-792.
ISSN 1662-0356
DOI: https://doi.org/10.4028/www.scientific.net/AST.45.787


Link zum Volltext (externe URL): Volltext


It is known, that by addition of zirconium layered phosphate (ZP) to perfluorinated sulfonic acid ionomers (PFSA), the proton conductivity of the composite decreases, but the high temperature stability and electrical efficiency increases as compared to the unmodified PFSA membrane. In order to clarify this finding, mechanical properties and conductivity of a commercially available PFSA ionomer (Nafion 117), PFSA-ZP and PFSA-calcium phosphate (CP) composites were examined ex-situ and in-situ under conditions similar to fuel cell application. The results indicate a strong columbic interaction between the organic and inorganic ZP phase, which at the same time increases the stiffness and Tg by ionic cross-linking and decreases conductivity. The interaction is more pronounced at low water activity. A threshold of about three water molecules per sulfonic acid group was identified, above which a significant increase in proton conductivity is achieved and, concomitantly, most of the mechanical stiffening effect has vanished. CP as inorganic additive, however, has a tendency to be washed out of the ionomer, most probably due to the high acidity of Nafion.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Layered Phosphates; Membrane; PEM Fuel Cell; PFSA Ionomer
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverarbeitung
Profilfelder > Advanced Fields
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 04 Mai 2015 12:32
Letzte Änderung: 04 Mai 2015 12:32
URI: https://eref.uni-bayreuth.de/id/eprint/11240