Effect of cathode separator structure on performance characteristics of free-breathing PEMFCs

被引:41
作者
Tabe, Yutaka
Park, Sang-Kyun
Kikuta, Kazushige
Chikahisa, Takemi
Hishinuma, Yukio
机构
[1] Hokkaido Univ, Div Energy & Environm Syst, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[2] E&E Res Inc, Hitachi, Ibaraki 3160032, Japan
关键词
PEMFC; free-breathing; open type; channel type; contact resistance; power;
D O I
10.1016/j.jpowsour.2006.06.093
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 performance of free-breathing polymer electrolyte membrane fuel cells (PEMFCs) was studied experimentally and the effect of the cathode separator structure on the cell performance was investigated. Two types of cathode separators were used for a cell with an 18 cm(2) active area: an open type with parallel rectangular open-slits and a channel type with straight vertical channels with open ends. The polarization curves, cell impedance, and contact pressure distribution of the separators were measured with each type of cathode structure. The result showed that it is difficult to realize a uniform contact pressure across the cell layers for the open type separator, and this results in higher contact resistance and poorer cell performance than the channel type separator. The channel type separator can maintain a low contact resistance, and the cell performance is strongly affected by the natural convection inside the channel. Optimization of the channel design of the channel type separator achieves good performance and this type of separator is superior for a free-breathing PEMFC. A computational three-dimensional analysis for the free-breathing channel type PEMFC with the different channel depths was performed, and it identified the influence of natural convection. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:58 / 65
页数:8
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