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Zirconium Phosphate Nafion® Composites - A Microstructure-based Explanation of Mechanical and Conductivity Properties

Titelangaben

Bauer, Felix ; Willert-Porada, Monika:
Zirconium Phosphate Nafion® Composites - A Microstructure-based Explanation of Mechanical and Conductivity Properties.
In: Solid State Ionics. Bd. 177 (Oktober 2006) Heft 26-32 . - S. 2391-2396.
ISSN 0167-2738
DOI: https://doi.org/10.1016/j.ssi.2006.07.031

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Link zum Volltext (externe URL): Volltext

Abstract

It is known that by addition of zirconium phosphate to perfluorinated sulfonic acid ionomers the proton conductivity of the resulting PFSA-ZP-composite decreases. Nevertheless, at high temperatures the stability and efficiency of the composite is greatly increased. In order to clarify these, at first sight, contradicting observations mechanical properties and conductivity of a PFSA ionomer (Nafion 117) and PFSA-ZP-composites were examined under conditions similar to fuel cell application. Water sorption-isotherms were used to directly relate mechanical and electrical properties to the water content at 75 °C. The results point at a strong coulombic interaction between organic and inorganic phase which at the same time increases the stiffness and TG by ionic crosslinking and decreases conductivity. The interaction is the more pronounced when the water activity is lower. A threshold of about three water molecules per sulfonic acid group was identified, above which a significant proton conductivity is achieved and, concurrently, most of the mechanical stiffening effect has vanished.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Layer phosphate; Composite membrane; Proton conductivity; dynamic mechanical analysis; Sorption isotherm
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverarbeitung
Profilfelder
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 12:57
Letzte Änderung: 04 Mai 2015 12:57
URI: https://eref.uni-bayreuth.de/id/eprint/11245