Evaluation of the Effect of Impregnated Platinum on PFSA Degradation for PEM Fuel Cells

    Authors

    M. P. Rodgers; B. P. Pearman; L. J. Bonville; D. A. Cullen; N. Mohajeri;D. K. Slattery

    Comments

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    Abbreviated Journal Title

    J. Electrochem. Soc.

    Keywords

    POLYMER-ELECTROLYTE MEMBRANES; EXCHANGE MEMBRANE; DURABILITY; DEPOSITION; DISSOLUTION; PARTICLE; MODEL; PT/C; BAND; Electrochemistry; Materials Science, Coatings & Films

    Abstract

    One of the main sources of membrane degradation in fuel cells is attack by radicals formed wherever Pt, H-2, and O-2 are present. The effect of Pt precipitated in the membrane is under debate. Although Pt can provide another site for radical formation, it can also scavenge hydrogen peroxide and radicals in the membrane and improve durability. In this work, the effects of Pt particles within the membrane are evaluated and related to membrane degradation. Membranes were ex situ impregnated with 0, 10, 30, and 50 mol% Pt and then tested for 100 h in a fuel cell, at 90 degrees C/100% relative humidity. The highest degradation was observed with the membranes containing 10 mol% Pt, with fluoride emissions of the same magnitude as those of catalyst coated membranes containing Pt/C. Membranes containing 0, 30, and 50 mol% Pt resulted in very low fluoride emission. The high degradation in the 10 mol% membrane was attributed to the low density of platinum particles, which allows generated radicals to attack the membrane before being deactivated. In the 30 mol% and 50 mol% membranes, where the platinum particles were denser, the generated radicals became deactivated on neighboring particles before they attacked the membrane. (C) 2013 The Electrochemical Society. All rights reserved.

    Journal Title

    Journal of the Electrochemical Society

    Volume

    160

    Issue/Number

    10

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    F1123

    Last Page

    F1128

    WOS Identifier

    WOS:000326207400074

    ISSN

    0013-4651

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