Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes

    Authors

    R. W. Kopitzke; C. A. Linkous; H. R. Anderson;G. L. Nelson

    Comments

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    Abbreviated Journal Title

    J. Electrochem. Soc.

    Keywords

    POLYMER ELECTROLYTE; ETHER KETONE); TEMPERATURES; Electrochemistry; Materials Science, Coatings & Films

    Abstract

    Water uptake and proton conductivity as a function of temperature were determined for three aromatic-based, sulfonic acid-bearing polymers, plus the perfluoroalkyl sulfonic acid Nafion(R) 117. Water uptake of submerged, equilibrated samples ranged from less than five water molecules per acid group for a high equivalent weight, sulfonated polyethersulfone to almost fifty waters per acid for a low equivalent weight, sulfonated polyetheretherketone. The most conductive aromatic-based polymer, sulfonated polyphenylquinoxaline (S-PPQ), had a room temperature conductivity of 9.8 X 10(-3) S/cm, about an order of magnitude less than that of a perfluoroalkyl sulfonic acid under identical conditions. The slope of the S-PPQ Arrhenius conductivity plot was sufficiently steep that at 180 degrees C, the proton conductivity, 1.3 X 10(-1) S/cm, was only a factor of two lower than that of Nafion under similar conditions. The lower conductivity of the aromatic-based sulfonic acid polymers can be attributed to chain rigidity, lack of ion channels, and lower acidity. (C) 2000 The Electrochemical Society. S0013-4651(99)07-011-1. All rights reserved.

    Journal Title

    Journal of the Electrochemical Society

    Volume

    147

    Issue/Number

    5

    Publication Date

    1-1-2000

    Document Type

    Article

    Language

    English

    First Page

    1677

    Last Page

    1681

    WOS Identifier

    WOS:000087075200012

    ISSN

    0013-4651

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