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

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®.

  Info
Periodical
Edited by
P. VINCENZINI
Pages
787-792
DOI
10.4028/www.scientific.net/AST.45.787
Citation
F. Bauer, A. Müller, A. Wojtkowiak, M. Willert-Porada, "In Situ and Ex Situ Characterization of PFSA-Inorganic Inclusion Composites for Medium Temperature PEM Fuel Cells", Advances in Science and Technology, Vol. 45, pp. 787-792, 2006
Online since
October 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Ming Liang Luo, Qing Zhi Wen, Hong Jian Liu, Jia Lin Liu
Abstract:Sulfonated-polyethersulfone/TiO2 (SPES/TiO2) nanoparticle composites with different TiO2 content were prepared by a sol-gel process. These...
663
Authors: S. Kanagaraj, A. Fonseca, R.M. Guedes, Monica S.A. Oliveira, José A.O. Simões
Abstract:Ultrahigh molecular weight polyethylene (UHMWPE) is a unique polymer with outstanding physical and mechanical properties that makes it...
331
Authors: Zhu Rui, Yu Tao Zhao, Song Li Zhang, Zhi Hong Jia
Chapter 1: Non-Ferrous Metal Material
Abstract:Abstract:Aluminum matrx composites reinforced by in situ ZrB2 particles are fabricated from A356-AlB-K2ZrF6 system via in-situ melt reaction...
122
Authors: Xin Fan
Chapter 3: Micro/Nano Materials
Abstract:Blends of Poly(L-lactide) (PLLA) and nano-SiO2 powder were prepared via solution mixing. Effect of nano-SiO2 particles on the crystallinity...
367
Authors: Dong Chen, Zhe Chen, Peng Zhang, Yi Jie Zhang, Haiheng Ma, Hao Wei Wang
Chapter 5: Metal Alloy Materials
Abstract:In-situ TiB2 particles reinforced AA7055 composites were fabricated through mixed-salts route and their bending properties were...
1005