Decreasing Membrane Degradation through Heteropolyacid Sub-layers

    Authors

    R. P. Brooker; L. J. Bonville;D. K. Slattery

    Comments

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    Abbreviated Journal Title

    J. Electrochem. Soc.

    Keywords

    POLYMER-ELECTROLYTE MEMBRANES; PEM FUEL-CELLS; DODECATUNGSTOPHOSPHORIC; ACID CRYSTALS; ION-EXCHANGE MEMBRANE; DODECAMOLYBDOPHOSPHORIC ACID; ELECTROCHEMICAL-BEHAVIOR; HUMIDITY RANGES; DURABILITY; PLATINUM; CARBON; Electrochemistry; Materials Science, Coatings & Films

    Abstract

    Heteropolyacids (HPAs) were adsorbed onto high surface area carbon, and incorporated in polymer electrolyte membrane fuel cells (PEMFCs) between the electrodes and membrane, forming "sub-layers." The addition of HPAs to these sub-layers significantly decreased membrane degradation in cells subjected to accelerated stress tests, as evidenced by a 50% reduction in fluoride emission rate (FER) and open circuit voltage (OCV) decay. Evidence of increased HPA and platinum concentration within the sub-layer indicates substantial HPA mobility. Modeling of the voltage profile through the sub-layer and membrane indicated that platinum precipitation was possible within the sub-layer, and that this is dependent on both the reduction potential and concentration of the HPA. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.017302jes] All rights reserved.

    Journal Title

    Journal of the Electrochemical Society

    Volume

    160

    Issue/Number

    1

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    F75

    Last Page

    F80

    WOS Identifier

    WOS:000313578400053

    ISSN

    0013-4651

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