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Observation of water transport in the micro-porous layer of a polymer electrolyte fuel cell with a freezing method and cryo-scanning electron microscope

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Title: Observation of water transport in the micro-porous layer of a polymer electrolyte fuel cell with a freezing method and cryo-scanning electron microscope
Authors: Aoyama, Yusuke Browse this author
Suzuki, Kengo Browse this author
Tabe, Yutaka Browse this author →KAKEN DB
Chikahisa, Takemi Browse this author →KAKEN DB
Keywords: PEFC
MPL
Direct observation
Water transport
Phase state
Issue Date: Apr-2014
Publisher: Elsevier
Journal Title: Electrochemistry Communications
Volume: 41
Start Page: 72
End Page: 75
Publisher DOI: 10.1016/j.elecom.2013.12.029
Abstract: Micro-porous layers (MPLs) play an important role in the water management of polymer electrolyte fuel cells (PEFCs), however, the detailed mechanism of how the produced water is drained from these layers is not well understood. This paper observed the cross-sectional distribution of liquid water inside the cathode MPL to elucidate details of the phase state of the water transported through the MPL The freezing method and ctyo-scanning electron microscope (cryo-SEM) are used for the observations; the freezing method enables immobilization of the liquid water in the cell as ice forms by the freezing, and the cryo-SEM can visualize the water distribution in the vicinity of the MPL at high resolution without the ice melting. It was shown that no liquid water accumulates inside the MPL in operation at 35 degrees C, while the pores of the MPL are filled with liquid water under very low cell temperature operation, at 5 degrees C. These results indicate that the produced water passes through the MPL not as a liquid but in the vapor state in usual PEFC operation. Additionally, liquid water at the interface between the MPL and a catalyst layer (CL) was identified, and the effect of the interfacial contact on the water distribution was examined.
Type: article (author version)
URI: http://hdl.handle.net/2115/56675
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: 田部 豊

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