High-temperature proton conducting membranes based on perfluorinated ionomer membrane-ionic liquid composites

Composite membranes that exhibit fast proton transport at elevated temperatures are needed for proton-exchange-membrane fuel cells and other electrochemical devices operating in the 100 to 200 C range. Traditional water-swollen proton conducting membranes such as the Nafion membrane suffer from the...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2000, Vol.147 (1), p.34-37
Main Authors: DOYLE, M, CHOI, S. K, PROULX, G
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
IONIC CONDUCTIVITY
MEMBRANES
ORGANIC FLUORINE COMPOUNDS
PROTON EXCHANGE MEMBRANE FUEL CELLS
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Summary:Composite membranes that exhibit fast proton transport at elevated temperatures are needed for proton-exchange-membrane fuel cells and other electrochemical devices operating in the 100 to 200 C range. Traditional water-swollen proton conducting membranes such as the Nafion membrane suffer from the volatility of water in this temperature range leading to a subsequent drop in conductivity. Here the authors demonstrate that perfluorinated ionomer membranes such as the Nafion membrane can be swollen with ionic liquids giving composite free-standing membranes with excellent stability and proton conductivity in this temperature range while retaining the low volatility of the ionic liquid. Ionic conductivities in excess of 0.1 S/cm at 180 C have been demonstrated using the ionic liquid 1-butyl, 3-methyl imidazolium trifluoromethane sulfonate. Comparisons between the ionic-liquid-swollen membrane and the neat liquid itself indicate substantial proton mobility in these composites.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1393153