On water transport in polymer electrolyte membranes during the passage of current

被引：19

作者：

Berning, Torsten ^{[1
]}

机构：

[1] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 15期

关键词：

PEM fuel cells; Membrane water transport; Electro-osmotic drag; Water uptake layer; EOD;

D O I：

10.1016/j.ijhydene.2011.04.079

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：

This article discusses an approach to model the water transport in the membranes of PEM fuel cells during operation. Starting from a frequently utilized equation the various transport mechanisms are analyzed in detail. It is shown that the commonly used approach to simply balance the electro-osmotic drag (EOD) with counter diffusion and/or hydraulic permeation is flawed, and that any net transport of water through the membrane is caused by diffusion. Depending on the effective drag the cathode side of the membrane may experience a lower hydration than the anode side. The effect of a water-uptake layer on the net water transport will also be pictured. Finally, the effect of EOD is visualized using "Newton's cradle". Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：9341 / 9344

页数：4

共 12 条

[1]

BANG M, 2004, THESIS AALBORG U

[2] Water Balance Simulations of a PEM Fuel Cell Using a Two-Fluid Model [J].