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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{reg_sign} 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{sup {minus}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 x 10{sup {minus}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.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Central Florida, Cocoa, FL (US)
OSTI Identifier:
20080563
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; PROTON EXCHANGE MEMBRANE FUEL CELLS; ELECTRIC CONDUCTIVITY; SULFONIC ACIDS; MEMBRANES; MOISTURE; ORGANIC POLYMERS

Citation Formats

Kopitzke, R.W., Linkous, C.A., Anderson, H.R., and Nelson, G.L. Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes. United States: N. p., 2000. Web. doi:10.1149/1.1393417.
Kopitzke, R.W., Linkous, C.A., Anderson, H.R., & Nelson, G.L. Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes. United States. doi:10.1149/1.1393417.
Kopitzke, R.W., Linkous, C.A., Anderson, H.R., and Nelson, G.L. Mon . "Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes". United States. doi:10.1149/1.1393417.
@article{osti_20080563,
title = {Conductivity and water uptake of aromatic-based proton exchange membrane electrolytes},
author = {Kopitzke, R.W. and Linkous, C.A. and Anderson, H.R. and Nelson, G.L.},
abstractNote = {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{reg_sign} 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{sup {minus}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 x 10{sup {minus}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.},
doi = {10.1149/1.1393417},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}