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Spatially resolved degradation effects in membrane-electrode-assemblies of vehicle aged polymer electrolyte membrane fuel cell stacks

Ettingshausen, F. and Kleemann, J. and Michel, M. and Quintus, M. and Fuess, H. and Roth, C. (2009):
Spatially resolved degradation effects in membrane-electrode-assemblies of vehicle aged polymer electrolyte membrane fuel cell stacks.
In: Journal of Power Sources, Elsevier Science Publishing Company, pp. 899-907, 194, (2), ISSN 03787753,
[Online-Edition: http://dx.doi.org/10.1016/j.jpowsour.2009.06.003],
[Article]

Abstract

State of the art MEAs were aged in a fuel cell vehicle and degradation effects analyzed using electron microscopy and electrochemical methods. All cells of the stack showed a performance decay along with a loss in the electrochemical surface area. This could be correlated to particle growth and carbon corrosion observed by electron microscopy. Spatially resolved investigations showed a significant deterioration of the cathode, which is particularly pronounced at the hydrogen inlet. Differences in the cell performance of the aged cells could not be attributed to a variation in the catalyst degradation, but are linked to an altered ohmic resistance in the cells. The ohmic resistance of the cells is likely to be affected by the formation of precipitates in the membrane and seems to be correlated with their size.

Item Type: Article
Erschienen: 2009
Creators: Ettingshausen, F. and Kleemann, J. and Michel, M. and Quintus, M. and Fuess, H. and Roth, C.
Title: Spatially resolved degradation effects in membrane-electrode-assemblies of vehicle aged polymer electrolyte membrane fuel cell stacks
Language: English
Abstract:

State of the art MEAs were aged in a fuel cell vehicle and degradation effects analyzed using electron microscopy and electrochemical methods. All cells of the stack showed a performance decay along with a loss in the electrochemical surface area. This could be correlated to particle growth and carbon corrosion observed by electron microscopy. Spatially resolved investigations showed a significant deterioration of the cathode, which is particularly pronounced at the hydrogen inlet. Differences in the cell performance of the aged cells could not be attributed to a variation in the catalyst degradation, but are linked to an altered ohmic resistance in the cells. The ohmic resistance of the cells is likely to be affected by the formation of precipitates in the membrane and seems to be correlated with their size.

Journal or Publication Title: Journal of Power Sources
Volume: 194
Number: 2
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: TEM, Fuel cells, Degradation, Spatially resolved, Precipitates, Cell resistance
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Feb 2013 09:12
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2009.06.003
Identification Number: doi:10.1016/j.jpowsour.2009.06.003
Funders: Financial support of the Federal Ministry of Education and Research (BMBF “KONNEKT”) has been gratefully acknowledged.
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