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Gaskets: Important Durability Issues

  • Ruth Bieringer
  • Matthias Adler
  • Stefan Geiss
  • Michael Viol

Abstract

In the past, the construction and optimization of single fuel cell components was often considered most important and relatively little attention has been paid to the sealing of the cells. Enduring sealing solutions though are a prerequisite for functionality, continuous operation and achievement of high efficiencies. The requirements for the applied sealing materials are multifarious; some of them are common to all types of polymer electrolyte fuel cells (PEFCs), while others depend on the type of fuel cell in question. Besides the usual requirements for sealing materials such as optimized relaxation behavior and a good processability allowing for inexpensive mass production, all suitable sealing materials must have a general fuel cell compatibility. First, the materials must not contain potential catalyst poisons which might migrate and deactivate the catalyst layer of the PEFC; second the materials must not contain any substances which might reduce the performance of the PEFC; and finally the materials must not contain any components which might be eluted and thus have the potential to block pores of the gas-diffusion layer, coat other active surfaces, or interfere in whatever way with the electrochemistry of the cell. The differences among the three main types of polymer-electrolyte-based fuel cells (PEFC, direct methanol fuel cell, high-temperature PEFC) for the sealing material are, on the one hand, the different temperatures at which the cells are operated and on the other hand, the different media against which the materials need to be resistant (water, fuel: H2, O2, reformate, methanol, formic acid, phosphoric acid, coolants). The resulting catalogue of requirements necessitates an in-depth understanding of the material behavior within the cell; therefore fundamental investigations need to emphasize a profound understanding of the deterioration mechanisms (e.g., oxidative and thermal processes, hydrolysis, chemical nature of the neighboring parts, influence of surrounding media, etc.). Many times the existing and commonly employed methods for evaluating the sealing performance of a gasket are found not to be sufficient, so either known methods have to be adapted or completely new methods have to be set up. With the resulting knowledge base optimized sealing solutions can be developed, including new materials and composites as well as innovative gasket designs.

Keywords

Fuel Cell Membrane Electrode Assembly Bipolar Plate Polymer Electrolyte Membrane Fuel Cell Polymer Electrolyte Fuel Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Ahn, S.-Y., Shin, S.-J., Ha, H.Y., Hong, S.-A., Lee, Y.-C., Lim, T. W. and Oh, I.-H. (2002) Performance and lifetime analysis of the kW-class PEMFC stack. J. Power Sources, 106, 295CrossRefGoogle Scholar
  2. Cleghorn, S.J.C., Mayfield, D.K., Moore, D.A., Moore, J.C., Rusch, G., Sherman, T.W., Sisofo, N.T. and Beuscher, U., (2006) A polymer electrolyte fuel cell life test: 3 years of continuous operation. J. Power Sources, 158, 446–454CrossRefGoogle Scholar
  3. Dillard, D.A., Guo, S., Ellis, M.W., Lesko, J.J., Dillard, J.G., Sayre, J. and Vijayendran, B. (2004) Seals and Sealants in PEM Fuel Cell Environments: Material, Design and Durability Challenges, Presented at the Second International Conference on Fuel Cell Science, Engineering and Technology, June 14–16, Rochester, New York, USAGoogle Scholar
  4. Frisch, L. (2003) PEMFC Stack Sealing Using Silicone Elastomers. Fuel Cell Power for transportation 2003 (SP-1741), Society of Automotive Engineers, Warrendale, PAGoogle Scholar
  5. Hinds, G. (2004) Performance and Durability of PEM Fuel Cells: A Review. NPL Report DEPC-MPE 002Google Scholar
  6. Husar, A., Serra, M. and Kunusch, C. (2007) Description of gasket failure in a 7 cell PEMFC stack. J. Power Sources, 169, 85–91CrossRefGoogle Scholar
  7. Schulze, M., Knöri, T., Schneider, A. and Gülzow, E.(2004) Degradation of sealings for PEFC test cells during fuel cell operation. J. Power Sources, 127, 222–229CrossRefGoogle Scholar
  8. Steele, B.C.H., Heinzel, A. (2001) Materials for fuel cell technologies. Nature, 414, 345–352CrossRefGoogle Scholar
  9. Tan, J., Chao, Y.J., Van Zee, J.W. and Lee, W.K. (2007) Degradation of elastomeric gasket materials in PEM fuel cells. Materials Science and Engineering A, 445–446, 669–675CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Ruth Bieringer
    • 1
  • Matthias Adler
    • 1
  • Stefan Geiss
    • 1
  • Michael Viol
    • 1
  1. 1.Freudenberg Forschungsdienste KGWeinheimGermany

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