Title

Conductivity And Water Uptake Of Aromatic-Based Proton Exchange Membrane Electrolytes

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 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 × 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°C, the proton conductivity, 1.3 × 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.

Publication Date

5-1-2000

Publication Title

Journal of the Electrochemical Society

Volume

147

Issue

5

Number of Pages

1677-1681

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1149/1.1393417

Socpus ID

0033738432 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0033738432

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