Evaluation of a sol-gel derived Nafion/silica hybrid membrane for polymer electrolyte membrane fuel cell applications - II. Methanol uptake and methanol permeability

被引:225
作者
Miyake, N [1 ]
Wainright, JS
Savinell, RF
机构
[1] Case Western Reserve Univ, ERnest B Yeager Ctr Electrochem Sci, Cleveland, OH 44106 USA
[2] Case Western Reserve Univ, Dept Chem Engn, Cleveland, OH 44106 USA
关键词
D O I
10.1149/1.1383072
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Sol-gel derived Nafion/silica hybrid membranes were investigated as a potential polymer electrolyte for direct methanol fuel cell applications. Methanol uptake and methanol permeability were measured in liquid and vapor phase as a function of temperature, methanol vapor activity, and silica content. Decreased methanol uptake from liquid methanol was observed in the hybrid membranes with silica contents of 10 and 21 wt%. The hybrid membrane with silica content of approximate to 20 wt % showed a significant lower methanol permeation rate when immersed in a liquid methanol-water mixture at 25 and 80 degreesC. Methanol uptake from the vapor phase by the hybrid membranes appears similar to that of unmodified Nafion. Methanol diffusion coefficients, as determined from sorption experiments, were slightly lower in the hybrid membranes than in unmodified Nafion. However, in direct permeation experiments, significantly lower methanol vapor permeability was seen only in the hybrid membrane with silica content of approximate to 20 wt %. Based on these results, Nafion/silica hybrid membranes with high silica content have potential as electrolytes for direct methanol fuel cells operating either on liquid or vapor-feed fuels. (C) 2001 The Electrochemical Society.
引用
收藏
页码:A905 / A909
页数:5
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