Conductivity and surface morphology of Nafion membrane in water and alcohol environments
Conductivity and surface morphology of Nafion membrane in water and alcohol environments
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DOI：
10.1016/j.jpowsour.2005.01.039
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发表时间：
2005-09-15
影响因子：
9.2
通讯作者：
Umeda, M
中科院分区：
文献类型：
--
作者：
Affoune, AM;Yamada, A;Umeda, M
采用电化学阻抗谱（EIS）和原子力显微镜（AFM）研究了甲醇、乙醇、异丙醇和水对Nafion膜质子导电性和表面性质的影响。结果表明，在乙醇环境中，Nafion膜的电导率和表面形貌均有所下降，而在水环境中，其电导率和表面形貌均呈现出较高的值和较大的粗糙度。我们测量了Nation在水-醇混合物环境中的电导率，结果证明了电导率和介电常数的依赖性，这已被解释的基础上的Born和Arrhenius方程。采用接触式和轻敲式原子力显微镜对纳米粒子的表面性质进行了研究。当样品吸收水分时，表面形貌会发生显著变化。然而，储存在醇中的样品的特征在于平坦的表面。表面改性与溶剂溶胀过程中的膨胀现象有关。自攻模式相位图像显示，离子和簇域是可区分的，无论是在水或醇浸渍的样品的表面。(c)2005 Elsevier B. V.保留所有权利。
Effects of methanol, ethanol, 2-propanol and water on the proton conductivity and surface properties of Nafion membrane have been studied by electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM). It was established that both conductivity and surface topography decrease in alcohol environment while they show high values and big roughness when Nafion is in aqueous environment. We have measured the conductivity of Nation in water-alcohol mixtures environments and results give evidence of conductivity and dielectric constant dependence, which has been explained on the basis of Born and Arrhenius equations. Nation's surface properties were investigated by contact and tapping AFM modes. Surface topography considerably changes when samples absorb water. However, samples stored in alcohols are characterized by flat surfaces. Surface modification was linked to an expansion phenomenon during the swelling of Nation by solvents. Tapping mode phase images showed that ionic and cluster domains are distinguishable from the surface of samples impregnated either in water or alcohols. (c) 2005 Elsevier B.V. All rights reserved.