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

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 wit...

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Bibliographic Details
Published in:Journal of power sources 2006-11, Vol.162 (1), p.58-65
Main Authors: Tabe, Yutaka, Park, Sang-Kyun, Kikuta, Kazushige, Chikahisa, Takemi, Hishinuma, Yukio
Format: Article
Language:English
Subjects:
Applied sciences
Channel type
Contact resistance
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Free-breathing
Fuel cells
Open type
PEMFC
Power
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Summary: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.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2006.06.093