Effect of equivalent weight on electrochemical mass transport properties of oxygen in proton exchange membranes based on sulfonated α,β,β-trifluorostyrene (BAM®) and sulfonated styrene-(ethylene-butylene)-styrene triblock (DAIS-analytical) copolymers

被引：53

作者：

Basura, VI ^{[1
]}

Chuy, C ^{[1
]}

Beattie, PD ^{[1
]}

Holdcroft, S ^{[1
]}

机构：

[1] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2001年 / 501卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

proton exchange membranes; mass transport of oxygen in PEM; limiting current densities; fuel cell;

D O I：

10.1016/S0022-0728(00)00503-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mass transport parameters and limiting current densities are determined for a series of sulfonated alpha,beta,beta -trifluorostyrene-co-substituted-alpha,beta,beta -trifluorostyrene (BAM (R)) (EW 407-735 g mol(-1)) and sulfonated styrene-(ethylene-butylene)-styrene copolymers (DAIS-Analytical) (EW 555-1062 g mol(-1)) proton exchange membranes using microelectrode techniques. These materials were investigated in an environment that mimics proton exchange membrane fuel cells. The oxygen diffusion coefficient increases with temperature, while its solubility decreases. AII membranes exhibit a Henry's Law dependence for the limiting current of the oxygen reduction reaction with increasing oxygen pressure. The limiting current and the oxygen diffusion coefficient decreases with increasing equivalent weight, while the solubility of oxygen decreases due to the corresponding change in water content. These data are discussed in the context of previously published data on Nafion 117 and ethylenetetrafluoroethylene-g-polystyrene sulfonic acid membranes. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：77 / 88

页数：12

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