Proton-conducting composite membranes derived from sulfonated hydrocarbon and inorganic materials

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Composite polymer membranes are prepared by embedding layered silicates such as Laponite and Montmorillonite (MMT) into sulfonated poly(ether ehter ketone) (sPEEK) membranes for fuel-cell applications. Sulfonation of the polymer increased membrane hydrophilicity to give good proton conductivity. Layered silicates incorporated into polymer membranes help to reduce swelling significantly in hot water; they also help to decrease methanol permeability. These polymer/clay composite membranes show thermal stability to 240 degreesC and (3-3.5) x 10(-3) S cm(-1) proton conductivity at room temperature. In addition, methanol cross-over is reduced without a serious reduction in the proton conductivity. In a single-cell test using hydrogen and oxygen, the prepared membranes give current densities that are between 70 and 80% of those with Nafion 115 membranes. As a result, for polymer electrolytes, sPEEK/clay composite membranes offer a low-cost alternative to perfluorinated membranes. (C) 2003 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2003-10
Language
English
Article Type
Article
Keywords

POLY(ARYL ETHER KETONE)

Citation

JOURNAL OF POWER SOURCES, v.124, no.1, pp.18 - 25

ISSN
0378-7753
URI
http://hdl.handle.net/10203/80169
Appears in Collection
CBE-Journal Papers(저널논문)
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