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    Transients of Water Distribution and Transport in PEM Fuel Cells

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    Type
    Article
    Authors
    Hussaini, Irfan S.
    Wang, Chao-Yang
    Date
    2009
    Permanent link to this record
    http://hdl.handle.net/10754/600063
    
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    Abstract
    The response of polymer electrolyte membrane (PEM) fuel cells to a step change in load is investigated experimentally in this work. Voltage undershoot, a characteristic feature of transient response following a step increase in current, is due to transients of water distribution in the membrane and ionomers occurring at subsecond time scales. The use of humidified reactants as a means to control the magnitude of voltage undershoot is demonstrated. Further, the response under a step decrease in current density is explored to determine the existence of hysteresis. Under sufficiently humidified conditions, the responses under forward and reverse step changes are symmetric, but under low relative humidity conditions, voltage undershoot is twice as large as the overshoot. © 2009 The Electrochemical Society.
    Citation
    Hussaini IS, Wang C-Y (2009) Transients of Water Distribution and Transport in PEM Fuel Cells. J Electrochem Soc 156: B1394. Available: http://dx.doi.org/10.1149/1.3236646.
    Sponsors
    Funding for this work from ECEC industrial sponsor is gratefully acknowledged. I. S. H. also acknowledges the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, for a fellowship award.
    Publisher
    The Electrochemical Society
    Journal
    Journal of The Electrochemical Society
    DOI
    10.1149/1.3236646
    ae974a485f413a2113503eed53cd6c53
    10.1149/1.3236646
    Scopus Count
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