Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes
Abbreviated Journal Title
J. Electrochem. Soc.
POLYMER ELECTROLYTE; ETHER KETONE); TEMPERATURES; Electrochemistry; Materials Science, Coatings & Films
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 of the Electrochemical Society
"Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes" (2000). Faculty Bibliography 2000s. 2652.