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

Title data

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. Vol. 45 (October 2006) . - pp. 787-792.
ISSN 1662-0356
DOI: https://doi.org/10.4028/www.scientific.net/AST.45.787

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Layered Phosphates; Membrane; PEM Fuel Cell; PFSA Ionomer
Institutions of the University: Faculties > Faculty of Engineering Science > Ehemalige Professoren > Chair Materials Processing - Univ.-Prof. Dr. Monika Willert-Porada
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Materials Processing
Profile Fields
Profile Fields > Advanced Fields
Faculties > Faculty of Engineering Science > Ehemalige Professoren
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 04 May 2015 12:32
Last Modified: 04 May 2015 12:32
URI: https://eref.uni-bayreuth.de/id/eprint/11240