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On-Line In-Situ Diagnostics of Processes Within HT-PEM Fuel Cells Membrane by Raman Microscopy

[+] Author Affiliations
Hans Bettermann, Martin Labus

Heinrich-Heine-University of Düsseldorf, Düsseldorf, Germany

Anne Majerus, Carsten Korte, Werner Lehnert

Forschungszentrum Jülich GmbH, Jülich, Germany

Paper No. FuelCell2013-18155, pp. V001T01A008; 6 pages
doi:10.1115/FuelCell2013-18155
From:
  • ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability
  • ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
  • Minneapolis, Minnesota, USA, July 14–19, 2013
  • Conference Sponsors: Advanced Energy Systems Division, Solar Energy Division
  • ISBN: 978-0-7918-5552-2
  • Copyright © 2013 by ASME

abstract

This contribution describes how Raman spectroscopy can be applied to investigate the distribution of molecular species inside an ABPBI membrane of a running PEM fuel cell. For the in-situ measurements an experimental setup was first developed and then used to identify phosphoric acid species and to record how they change their concentrations when the current consumption of the fuel cell was changed. The observation port to look inside the membrane was placed next to the cathode. At that location among orthophosphoric acid, H3PO4·H2O, a lot of oligophosphoric acid species are present where pyrophosphoric acid could unambiguously be identified. In comparison to all identified species pyrophoshoric acid and polyphosphoric acid undergo largest concentration changes when the current was changed.

Copyright © 2013 by ASME

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