Adsorption properties of water vapor on sulfonated perfluoropolymer membranes
Adsorption properties of water vapor on sulfonated perfluoropolymer membranes
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DOI：
10.1016/j.ijhydene.2006.09.041
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发表时间：
2007-03
影响因子：
7.2
通讯作者：
H. Takata;Nobukazu Mizuno;M. Nishikawa;S. Fukada;M. Yoshitake
中科院分区：
文献类型：
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作者：
H. Takata;Nobukazu Mizuno;M. Nishikawa;S. Fukada;M. Yoshitake
电解质膜中的关键现象是水的吸附、水的扩散、电渗透阻力和水的生成。本研究量化了水蒸气在膜上的吸附特性，作为定量阐明这些水传输现象的第一步。用微量天平和温湿度计测定了Flemion®膜的吸水量、水蒸气分压和温度之间的关系。所得实验值呈S型曲线，用有限层B.E.T.方程建立的吸附模型可以解释这些实验值。实验结果表明，该吸附模型同样适用于Nafion®膜，其适用范围为10~80∘C。此外，本研究还发现，团簇水的含量与膜的质子电导率密切相关。
The key phenomena in the electrolyte membrane for the adequate water management are water adsorption, water diffusion, electro-osmotic drag and water generation. The adsorption properties of water vapor on the membrane were quantified in this study as a first step of quantitative elucidation of these water transport phenomena. The relationship among the amount of adsorbed water on Flemion®membrane, partial pressure of water vapor and temperature was measured by using a micro balance and a thermohygrometer. The experimental values obtained in this study form sigmoid curves, and the adsorption model developed from finite layer B.E.T. equation can elucidate these experimental values. It was confirmed that the adsorption model can be applied also to Nafion®membrane and that applicable range of this model is from 10 to 80∘C. Moreover, it was found in this study that the amount of clustered water has close relation with the proton conductivity of the membrane.