At present proton exchange membrane (PEM) performance levels and fuel cell stack operating conditions, require a plate area specific resistance of less than 30mohmcm2 and a plate thickness of less than 2mm are required to meet the vehicular volumetric power density target (>2kWl-1). Unfortunately, it is difficult to meet these targets, and simultaneously obtain good mechanical properties and low through-thickness hydrogen permeation rates when using polymeric plate materials. Polymers are brittle at the high conductive filler concentrations (e.g. >50 v/o graphite) required for high conductivity, and are more likely to generate high convection-driven H2 permeation rates at a high graphite loading and at a thin plate thickness. As a result, high scrap rates are realized during plate manufacturing and stacking operations, and excessive permeation rates are anticipated in pressurized stacks. This study addresses H2 permeation concerns associated with using thin, highly-filled composite plates, and investigates factors affecting permeation such as plate temperature, thickness, graphite loading, and aging. (All rights reserved Elsevier).


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    Title :

    Automotive composite fuel cell bipolar plates: Hydrogen permeation concerns


    Contributors:
    Blunk, R. (author) / Zhong, Feng (author) / Owens, J. (author)

    Published in:

    Journal of Power Sources ; 159 , 1 ; 533-542


    Publication date :

    2006


    Size :

    10 Seiten, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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