As CO is strongly poisoning the Pt-based anode catalyst of the PEM (proton exchange membrane) fuel cell-stack, its concentration in the feed gas has to be reduced to a level below 100 ppm. Various options are available to respond to the challenge of CO poisoning. This challenge was addressed by the development of advanced catalyst materials for mobile PEM fuel cell systems, primarily catalysts for preferential oxidation of CO (PrOx) and PtRu-based electrocatalysts for CO-tolerant membrane-electrode assemblies (MEA). New precious metal based PrOx catalysts supported on pellets, beads or monoliths are reducing the CO content in hydrogen to less than 100 ppm. However, dynamic testing shows that CO spikes can occur upon sudden changes of the reactor load. In the case of CO-tolerant MEA, results of steady state and dynamic measurements are presented. The advanced MEA developed by Degussa-Huels tolerate up to 100 ppm of CO in the anode feed gas without major performance loss. Low air bleed levels of 2 vol.% (for 100 ppm CO) and 1 vol.% (for 40 ppm CO) are required. Additional spikes of 200 ppm CO can be tolerated without irreversible voltage drop or loss of performance. Electrocatalysts and MEA products are to be improved continuously in order to meet the performance targets of future PEM fuel cell applications in vehicles.


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    Title :

    Advanced catalyst systems for mobile PEMFC applications - the challenge of carbon monoxide


    Additional title:

    Fortschrittliche Katalysatorsysteme für mobile PEM-Brennstoffzellenanwendungen - die Herausforderung durch Kohlenmonoxid


    Contributors:
    Starz, K.A. (author) / Auer, E. (author) / Baumann, F. (author) / Lehmann, T. (author) / Wieland, S. (author) / Zuber, R. (author)


    Publication date :

    2000


    Size :

    6 Seiten, 8 Bilder, 11 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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