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

被引:329
作者
Doyle, M [1 ]
Choi, SK [1 ]
Proulx, G [1 ]
机构
[1] DuPont Co Inc, Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA
关键词
D O I
10.1149/1.1393153
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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 degrees 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 we 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 degrees C have been demonstrated using the ionic liquid 1-butyl, 3-methyl imidazolium trifluoromethane sulfonate. Comparison between the ionic-liquid-swollen membrane and the neat liquid itself indicate substantial proton mobility in these composites. (C) 2000 The Electrochemical Society. S0013-4651(99)06-126-1. All rights reserved.
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页码:34 / 37
页数:4
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