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In Situ Membrane Parameter Determination Using Simultaneously Locally Resolved Impedance Spectroscopy and Dynamic Water Partial Pressure Measurement in PEFCs

[+] Author Affiliations
M. H. Bayer, A. Wokaun, G. G. Scherer, I. A. Schneider

Paul Scherrer Institut, Villigen PSI, Switzerland

Paper No. FuelCell2010-33041, pp. 463-470; 8 pages
doi:10.1115/FuelCell2010-33041
From:
  • ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 1
  • Brooklyn, New York, USA, June 14–16, 2010
  • Conference Sponsors: Advanced Energy Systems Division
  • ISBN: 978-0-7918-4404-5 | eISBN: 978-0-7918-3875-4
  • Copyright © 2010 by ASME

abstract

Tunable diode laser absorption spectroscopy (TDLAS) is used to measure the local ac response of the water partial pressure to a sinusoidal current excitation during locally resolved impedance measurements in a sub-saturated polymer electrolyte fuel cell (PEFC). The experimental results, along with the locally resolved impedance data are compared to calculated data as obtained from a 1+1 dimensional ac impedance model. The detailed experimental data allows model validation and in situ parameter determination. The model results are in good agreement with the experimental results. This emphasizes the importance to consider the build-up of water partial pressure oscillations along the gas channels in ac impedance models for sub-saturated PEFCs. The results show that minor modifications of literature membrane parameters are needed for a good fit to the experimental data set.

Copyright © 2010 by ASME

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