Title: Analysis of membrane electrode assembly (MEA) by environmental scanning electron microscope (ESEM)
Authors : Yu, Hong Mei
Schumacher, Jürgen
Zobel, Marco
Hebling, Christopher
Published in : Journal of power sources
Volume(Issue) : 145
Issue : 2
Pages : 216
Pages to: 222
Publisher / Ed. Institution : Elsevier
Issue Date: 18-Aug-2005
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Pefc; Fuel cells; Environmental scanning microscope
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: To date, the available equipment for characterising the microstructure of membrane electrode assembly (MEA) is still not well developed. For example, applying the normal scanning electron microscope (SEM) only provides information on the dry structure of MEAs. This paper presents a microstructure analysis method of MEAs in proton exchange membrane fuel cells (PEMFC). The microstructure analysis in this paper utilises the environmental scanning electron microscope (ESEM), which shows its advantage on the sample microstructure analysis in wet mode. When water is present, the characteristics of the MEA, especially the hydrophobic and/or hydrophilic properties, are distinguishable on the ESEM images. With proper temperature and pressure control, the water distribution within both the membrane and the catalyst layer can be viewed by ESEM. Based on ESEM measurement and mercury porosity measurement, the distributions of hydrophobic and hydrophilic pores in MEA have been analyzed. By means of ESEM and energy dispersive X-ray (EDX), a degraded MEA is characterized. The microstructure change of the degraded MEA has been discussed. The results provide helpful information for the understanding of MEAs in PEMFC.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1016/j.jpowsour.2004.12.069
ISSN: 0378-7753
1873-2755
URI: https://digitalcollection.zhaw.ch/handle/11475/11604
Appears in Collections:Publikationen School of Engineering

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