Positron annihilation study of ion-exchanged forms of Nafione membrane

被引：3

作者：

Mohamed, Hamdy F. M. ^{[1
]}

Kobayashi, Y. ^{[1
]}

Kuroda, C. S. ^{[1
]}

Ohira, A. ^{[1
]}

机构：

[1] Menia Univ, Fac Sci, Dept Phys, POB 61519, Al Minya, Egypt

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 11 | 2009年 / 6卷 / 11期

关键词：

ELECTROLYTE FUEL-CELLS; FREE-VOLUME; TEMPERATURE-DEPENDENCE; WATER MANAGEMENT; IMPURITY IONS; DIFFUSIVITY; TRANSPORT; SIDE;

D O I：

10.1002/pssc.200982061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Positron annihilation lifetime and oxygen permeability in ion-exchanged forms (H+-, Na+-, K+-, Cu2+-, Ni2+-, and Fe3+ forms) of Nation membranes for polymer electrolyte fuel cells (PEFC's) have been investigated as a function of temperature. Exchange of H+ with Cu2+, Ni2+, or Fe3+ in Nafion decreases both the o-Ps lifetime and its intensity, being interpreted as the result of inhibition and quenching of Ps. For the H+, Na+, and K+-forms good correlations were observed between the logarithm of the O-2 permeability and o-Ps lifetime (free volume size) at different temperatures indicating the important role played by the free volume in O-2 permeation. Considerable downward deviation of the correlations for the Na+- and K+-forms from the litform revealed the importance of polymer stiffening in O-2 permeation. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2392 / +

页数：2

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