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    • Comparative Study of On‐Line Membrane Electrode Assembly Activation Procedures in Proton Exchange Membrane Fuel Cell

    M. Zhiani,S. Majidi,M. M. Taghiabadi

    FUEL CELLS（2013）

    Isfahan Univ Technol

    Cited 46|Views5
    Abstract
    The major objectives of this study are to identify the best activation procedure between commonly used procedures that can significantly reduce the conditioning duration and to understand the change in interfacial properties during conditioning. In order to do that, three on-line activation procedures were employed for activating of identical MEAs in PEMFC and studied by polarization curve and electrochemical impedance spectroscopy (EIS). These methods are constant current (0.25Acm(-2)) for 19h, constant voltage (0.6V) for 9h, and USFCC protocol. The best performance was achieved by USFCC protocol within 15h, but by constant voltage procedure, 96% of mentioned protocol was obtained during 6h. So constant voltage activation proceeded remarkably fast, and most of the activation process was achieved in the first few hours. Obtained results from Nyquist plots during/after MEA conditioning indicate mentioned process are irreversible and interfacial structures of MEAs are different even after finishing of MEA break-in. It could be affected the MEA performance and even its durability. These results are consistence with the obtained performance of activated MEAs either in H-2/air or H-2/O-2 PEMFC. We found the mentioned constant current procedure consume long time without reaching to expectable performance even after 19h.
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    Key words
    Activation,Break-in,Membrane Electrode Assembly,Proton Exchange Membrane Fuel Cells
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