Degradation of PEMFC performance under dynamic loading cycling situation was studied by simulating automotive working conditions. A protocol of driving cycle was set up. Each driving cycle was consisting of six different periods. The performance of the fuel cell during driving cycle periods was represented by time-dependent voltage profiles. Polarization curves, measured in regular intervals, revealed a changed degradation rate in different operation periods. A rapid degradation of performance could be observed after 280 h of operation. In contrast to the starting conditions of the MEA, the degradation of membrane and dissolution and aggregation of catalysts were clearly visible at the end of testing. Furthermore, after 370 h of testing, Pt was not uniformly dispersed in the catalysts layer and some also scattered in the membrane. Cracks and gaps appeared in the catalyst layer. This change of micro-structure corresponded to the loss of electro-chemical active area of the MEA and the increased membrane resistance and charge transfer resistance.


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    Title :

    Investigation of dynamic driving cycle effect on performance degradation and micro-structure change of PEM fuel cell


    Additional title:

    Untersuchung der Leistungsdegradation und der Mikrogefügeänderung einer PEM-Brennstoffzelle durch den dynamischen Fahrzyklus


    Contributors:
    Lin, R. (author) / Li, B. (author) / Hou, Y.P. (author) / Ma, J.M. (author)

    Published in:

    Publication date :

    2009


    Size :

    8 Seiten, 9 Bilder, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English