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Impact of micro-porous layer on liquid water distribution at the catalyst layer interface and cell performance in a polymer electrolyte membrane fuel cell

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タイトル: Impact of micro-porous layer on liquid water distribution at the catalyst layer interface and cell performance in a polymer electrolyte membrane fuel cell
著者: Tabe, Yutaka 著作を一覧する
Aoyama, Yusuke 著作を一覧する
Kadowaki, Kazumasa 著作を一覧する
Suzuki, Kengo 著作を一覧する
Chikahisa, Takemi 著作を一覧する
キーワード: PEM fuel cell
Micro-porous layer
Liquid water distribution
Flooding
Image analysis
Water management
発行日: 2015年 8月 1日
出版者: Elsevier
誌名: Journal of Power Sources
巻: 287
開始ページ: 422
終了ページ: 430
出版社 DOI: 10.1016/j.jpowsour.2015.04.095
抄録: In polymer electrolyte membrane fuel cells, a gas diffusion layer (GDL) with a micro-porous layer (MPL) gives better anti-flooding performance than GDLs without an MPL. To investigate the function and mechanism of the MPL to suppress water flooding, the liquid water distribution at the cathode catalyst layer (CL) surface are observed by a freezing method; in the method liquid water is immobilized in ice form by rapid freezing, followed by disassembling the cell for observations. The ice covered area is quantified by image processing and cells with and without an MPL are compared. The results show that the MPL suppresses water accumulation at the interface due to smaller pore size and finer contact with the CL, and this results in less water flooding. Investigation of ice formed after −10 °C cold start shutdowns and the temporary performance deterioration at ordinary temperatures also indicates a significant influence of the liquid water accumulating at the interface. The importance of the fine contact between CL and MPL, the relative absence of gaps, is demonstrated by a gas diffusion electrode (GDE) which is directly coated with catalyst ink on the surface of the MPL achieving finer contact of the layers.
Rights: © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/66894
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 田部 豊

 

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