Stabilized heteropolyacid/Nafion® composite membranes for elevated temperature/low relative humidity PEFC operation

被引：150

作者：

Ramani, V ^{[1
]}

Kunz, HR ^{[1
]}

Fenton, JM ^{[1
]}

机构：

[1] Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA

来源：

ELECTROCHIMICA ACTA | 2005年 / 50卷 / 05期

关键词：

polymer electrolyte; high temperature; low relative humidity; stabilized heteropolyacid; Nafion (R);

D O I：

10.1016/j.electacta.2004.08.015

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Organic/inorganic composite membranes with different inorganic heteropolyacid (HPA) additives maintain sufficient proton conductivities for atmospheric pressure elevated temperature (>100degreesC) polymer electrolyte fuel cell (PEFC) operation. However, membrane and membrane electrode assembly (MEA) processing is severely curtailed because of the solubility of the HPA additives in aqueous media. Composite membranes with the HPA (phosphotungstic acid; PTA) additive rendered insoluble by ion exchanging protons with larger cations such as Cs+, NH4+, Rb+ and Tl+ were fabricated. The additive loss in aqueous media was lowered from nearly 100% (unmodified HPA) to about 5% (modified HPA). The membranes were robust, and demonstrated low H-2 crossover currents of around 2 mA/cm(2) for a 28 mum thick membrane. All membranes were evaluated at high temperatures and low relative humidities in an operating fuel cell. The conductivities of the composite membranes at 120degreesC and 35% relative humidity were on the order of 1.6 x 10(-2) S/cm. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：1181 / 1187

页数：7

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