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Electron microscopy techniques for the analysis of the polymer electrolyte distribution in proton exchange membrane fuel cells

Scheiba, Frieder and Benker, Nathalie and Kunz, Ulrike and Roth, Christina and Fuess, Hartmut (2008):
Electron microscopy techniques for the analysis of the polymer electrolyte distribution in proton exchange membrane fuel cells.
In: Journal of Power Sources, Elsevier Science Publishing Company, pp. 273-280, 177, (2), ISSN 03787753, [Online-Edition: http://dx.doi.org/10.1016/j.jpowsour.2007.11.085],
[Article]

Abstract

The polymer electrolyte distribution in PEMFC electrodes plays an important role for the catalyst utilization and various transport processes in the electrode. Moreover, its influence on the transport processes is not only limited to proton transport but it may also affect gas transport, electron conductivity and water management of the cell. However, experimental techniques to study the polymer electrolyte distribution are scarce. In this paper we present various approaches based on scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to characterize the polymer electrolyte distribution. The methods presented include staining of the polymer electrolyte with heavy metal ions, energy dispersive X-ray (EDX) mapping and energy filtered imaging (EFI). Their use for the analysis of the polymer electrolyte distribution and electrode structure will be presented and current limitations of these techniques will be discussed.

Item Type: Article
Erschienen: 2008
Creators: Scheiba, Frieder and Benker, Nathalie and Kunz, Ulrike and Roth, Christina and Fuess, Hartmut
Title: Electron microscopy techniques for the analysis of the polymer electrolyte distribution in proton exchange membrane fuel cells
Language: English
Abstract:

The polymer electrolyte distribution in PEMFC electrodes plays an important role for the catalyst utilization and various transport processes in the electrode. Moreover, its influence on the transport processes is not only limited to proton transport but it may also affect gas transport, electron conductivity and water management of the cell. However, experimental techniques to study the polymer electrolyte distribution are scarce. In this paper we present various approaches based on scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to characterize the polymer electrolyte distribution. The methods presented include staining of the polymer electrolyte with heavy metal ions, energy dispersive X-ray (EDX) mapping and energy filtered imaging (EFI). Their use for the analysis of the polymer electrolyte distribution and electrode structure will be presented and current limitations of these techniques will be discussed.

Journal or Publication Title: Journal of Power Sources
Volume: 177
Number: 2
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: PEMFC, Polymer electrolyte, Ionomer, Distribution, EF-TEM, EDX mapping, Microtomy
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Environmental Mineralogy
11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Feb 2013 08:26
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2007.11.085
Identification Number: doi:10.1016/j.jpowsour.2007.11.085
Funders: Financial support from the DFG and the Sino-German Center in Beijing in a joint project between the ZAE Bayern (Garching, Germany), the School of Chemistry (Tsinghua University, Beijing, China),, and the Institute of Materials Science (Darmstadt University of Technology, Germany) are gratefully acknowledged.
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