Characteristics of oxygen diffusivity and water distribution by X-ray radiography in microporous media in alternate porous layers of different wettability for moisture control in gas diffusion layer of PEFC

被引：35
作者：
Utaka, Yoshio [1 ]
Hirose, Ikunori [2 ]
Tasaki, Yutaka [3 ]
机构：
[1] Yokohama Natl Univ, Div Syst Res, Yokohama, Kanagawa 2408501, Japan
[2] Olympus Co, Tokyo 1928512, Japan
[3] Nissan Motor Co Ltd, Nissan Res Ctr, Yokosuka, Kanagawa 2378523, Japan
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 15期
基金：
日本学术振兴会;
关键词：
Mass transfer; Oxygen diffusivity; Microporous media; X-ray radiography; Polymer electrolyte fuel cell;
D O I：
10.1016/j.ijhydene.2011.04.152
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：
The mass transfer characteristics of the gas diffusion layer (GDL) are closely related to the performance of polymer electrolyte fuel cells. This study investigates the configuration of a new GDL in which two porous media with different wettabilities are alternately arranged (hybrid GDL). The oxygen diffusivity characteristics with respect to water content (saturation) were measured using an experimental system that employs a galvanic oxygen sensor as an oxygen absorber. Furthermore, X-ray radiography was used to observe the internal water distribution in microporous media for GDL to elucidate the enhancement mechanisms of oxygen diffusivity of the new microporous media. It was possible to distinguish between voids and water in microporous media by using X-ray computer tomography. In addition, the water distributions in the new microporous media were visualized and the mechanisms for the high oxygen diffusivity of the hybrid structure of microporous media were clarified. Copyright (c) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：9128 / 9138
页数：11
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