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
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 |
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Refereed: | Yes |
Keywords: | Layered Phosphates; Membrane; PEM Fuel Cell; PFSA Ionomer |
Institutions of the University: | Faculties > Faculty of Engineering Science > Former Professors > Chair Electrochemical Process Engineering - 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 Electrochemical Process Engineering Profile Fields Profile Fields > Advanced Fields Faculties > Faculty of Engineering Science > Former Professors |
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 |