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

Title data

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

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Layer phosphate; Composite membrane; Proton conductivity; dynamic mechanical analysis; Sorption isotherm
Institutions of the University: Faculties > Faculty of Engineering Science
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 > 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 12:57
Last Modified: 04 May 2015 12:57
URI: https://eref.uni-bayreuth.de/id/eprint/11245