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Performance and liquid water distribution in PEFCs with different anisotropic fiber directions of the GDL

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Title: Performance and liquid water distribution in PEFCs with different anisotropic fiber directions of the GDL
Authors: Naing, Kyaw Swar Soe Browse this author
Tabe, Yutaka Browse this author →KAKEN DB
Chikahisa, Takemi Browse this author →KAKEN DB
Keywords: PEM fuel cell
Gas diffusion layer
Anisotropic fiber direction
Freezing method
Issue Date: 1-Mar-2011
Publisher: Elsevier B.V.
Journal Title: Journal of Power Sources
Volume: 196
Issue: 5
Start Page: 2584
End Page: 2594
Publisher DOI: 10.1016/j.jpowsour.2010.10.080
Abstract: To maintain the efficiency of proton exchange membrane fuel cells (PEFC) without flooding, it is necessary to control the liquid water transport in the gas diffusion layer (GDL). This experimental study investigates the effects of the GDL fiber direction on the cell performance using an anisotropic GDL. The results of the experiments show that the efficiency of the cell is better when the fiber direction is perpendicular to the channel direction, and that the cells with perpendicular fibers are more tolerant to flooding than cells with fibers parallel to the channel direction. To determine the mechanism of the fiber direction effects, the liquid water behavior in the channels was observed through a glass window on the cathode side. The observations substantiate that the liquid water produced under the ribs is removed more smoothly with the perpendicular fiber direction. Additionally, the water inside the GDL was frozen to observe its distribution using a specially made cell broken into two pieces. The photographic results show that the amount of water under the ribs is larger than that under the channels using the parallel fiber direction GDL while the water distributions in these two places are almost equal level with the perpendicular fiber direction GDL. This freezing method confirmed the better liquid water removal ability and better reactant gas transportation in the GDL with the fiber direction perpendicular to the channel direction.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 近久 武美

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