Title

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

Authors

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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