Voltage jump during polarization of a PEM fuel cell operated at low relative humidities

被引：14

作者：

Song, Chaojie ^{[1
]}

Chua, Chris Jensen ^{[1
]}

Tang, Yanghua ^{[1
]}

Zhang, JianLu ^{[1
]}

Zhang, Jiujun ^{[1
]}

Li, Jing ^{[2
]}

Wang, Keping ^{[2
]}

McDermid, Scott ^{[2
]}

Kozak, Paul ^{[2
]}

机构：

[1] Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada

[2] Ballard Power Syst Inc, R&D, Burnaby, BC V5J 5J9, Canada

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2008年 / 33卷 / 11期

关键词：

PEM fuel cell(s); voltage jump; low relative humidity; membrane resistance; proton electro-osmotic drag; cathode water back-diffusion;

D O I：

10.1016/j.ijhydene.2008.03.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A PEM fuel cell with a Nafion 211 membrane-based membrane electrode assembly (MEA) was tested with an H-2/air stoichiometry of 2/4 at 25%, 50%, 75%, and 100% relative humidities. A voltage jump on the polarization curve was observed when the cell was operated at a lower humidity. This phenomenon may be explained by the water back-diffusion from the cathode into the membrane resulting in both a non-uniform water distribution in the membrane and a liquid-equilibrated interface between the membrane and the anode catalyst layer. Experimental results obtained by AC impedance spectroscopy measuring the MEA resistance (membrane+catalyst ionomer layers) at different current densities as well as collected polarization data at high feed-gas flow rates (or at low backpressures) and high temperatures all confirmed the validity of the proposed water back-diffusion hypothesis. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：2802 / 2807

页数：6

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