膜
Nafion公司
电解质
化学
相对湿度
离子电导率
电导率
钠
杂质
无机化学
离子键合
含水量
分析化学(期刊)
色谱法
电化学
离子
有机化学
物理化学
热力学
生物化学
电极
工程类
物理
岩土工程
作者
J. C. Bendert,Dionissios D. Papadias,Deborah J. Myers
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2010-01-01
卷期号:157 (10): B1486-B1486
被引量:17
摘要
Water uptake and ionic conductivities are reported for Nafion 115 membranes as functions of water activity and percentage of sulfonic groups occupied by sodium impurities. Water content was determined gravimetrically under liquid hydration and at 100, 75.3, and 11.3% relative humidity (RH). Water content exponentially decreased from the -form membrane water uptake isotherm to the -form isotherm when hydrated by water vapor. Ninety percent of this decrease is reached at a substitution level of . Water uptake under liquid water hydration decreased more gradually, only 50% to completion at . Four-probe conductivity testing of Nafion 115 membranes, normalized against dry dimensions, revealed that although hydration decreases immediately with the introduction of sodium impurities, ionic conductivity at 100% RH remains constant up to . Above an exponential decrease in ionic conductivity is observed with higher sodium content. The dependence of ionic conductivity on water content is also reported for sodium contents of 0, 0.27, 0.62 and .
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