The use of a novel water porosimeter to predict the water handling behaviour of gas diffusion media used in polymer electrolyte fuel cells

被引：31

作者：

Harkness, I. R. ^{[1
]}

Hussain, N. ^{[1
]}

Smith, L. ^{[1
]}

Sharman, J. D. B. ^{[1
]}

机构：

[1] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

来源：

JOURNAL OF POWER SOURCES | 2009年 / 193卷 / 01期

关键词：

PEMFC; Two phase flow; Gas diffusion layer; Flooding; Porosimetry; VALIDATED LEVERETT APPROACH; CAPILLARY-PRESSURE; MULTIPHASE FLOW; MERCURY POROSIMETRY; WETTABILITY; LAYERS; PEMFC;

D O I：

10.1016/j.jpowsour.2008.11.055

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 novel water porosimeter and its use in determining the capillarity of gas diffusion layers are described. It is found that. in accordance with the Washburn equation, the pressure required to force water into the gas diffusion layer depends on the cosine of the contact angle of water with the surface of the pore. Negative pressure is required to withdraw water from the gas diffusion layer, even when the surface is hydrophobic. The negative pressure required is found to be independent of surface contact angle. It is shown that the performance of gas diffusion layers in an operating fuel cell can be qualitatively predicted from the capillary pressure curves obtained. The advantages of the use of water porosimetry over the use of either mercury porosimetry or porosimetry using wetting fluids are discussed. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：122 / 129

页数：8