Composite silica/Nafion® membranes prepared by tetraethylorthosilicate sol-gel reaction and solution casting for direct methanol fuel cells

被引:242
作者
Jiang, RC [1 ]
Kunz, HR
Fenton, JM
机构
[1] Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA
[2] Univ Cent Florida, Florida Solar Energy Ctr, Cocoa, FL USA
关键词
silica/Nafion (R); composite membranes; sol-gel; direct methanol fuel cell (DMFC);
D O I
10.1016/j.memsci.2005.07.026
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Composite silica/Nafion (R) membranes were prepared using a tetraethylorthosilicate (TEOS) hydrolysis sol-gel reaction followed by solution casting. Physico-chemical properties of the composite membranes were characterized by TGA, XRD, Fr-IR, SEM-EDX and water uptake. Membranes were investigated in direct methanol fuel cells (DMFCs). Lower silica loadings (3 and 5 wt.%) in the composite membranes helped to inhibit methanol crossover through the membrane, while higher silica loadings demonstrated a smaller contribution to lowering the methanol crossover. Proton conductivity of the composite membranes decreased with increasing silica content, in spite of the increasing membrane water uptake. DMFC performance using the composite membrane with 5 wt.% silica loading was higher than using a pure Nafion (R) membrane. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:116 / 124
页数:9
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