Investigation of platinum oxidation in PEM fuel cells at various relative humidities

    Authors

    H. Xu; R. Kunz;J. M. Fenton

    Comments

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    Abbreviated Journal Title

    Electrochem. Solid State Lett.

    Keywords

    OXIDE-GROWTH; KINETICS; Electrochemistry; Materials Science, Multidisciplinary

    Abstract

    Surface oxidation of Pt cathode of proton exchange membrane (PEM) fuel cells at different relative humidities (RHs) was studied using cyclic voltammetry. The degree of platinum oxidation increased significantly with an increase in RH from 20% to 72%. Holding the cathode at high potentials and exposing it to air instead of N-2 resulted in the formation of more platinum oxides. At 20% RH, 0.85 V, and 100 degrees C, both water and oxygen equally contribute to platinum oxidation; at 100% RH, 0.85 V, and 100 degrees C, water produces more than 70% of the platinum oxidation while 30% forms from oxygen. (c) 2006 The Electrochemical Society.

    Journal Title

    Electrochemical and Solid State Letters

    Volume

    10

    Issue/Number

    1

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    B1

    Last Page

    B5

    WOS Identifier

    WOS:000242165400005

    ISSN

    1099-0062

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