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Bipolar concept for alkaline fuel cells

Gülzow, Erich and Schulze, Mathias and Gerke, Udo (2006) Bipolar concept for alkaline fuel cells. Journal of Power Sources, 156, pp. 1-7. Elsevier Science Direct. DOI: 10.1016/j.jpowsour.2005.08.032

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Official URL: http://www.elsevier.com/locate/jpowsour


Alkaline fuel cell stacks are mostly build in monopolar configuration of the cells. At the German Aerospace Center a bipolar plate for alkaline fuel cells has been developed and characterized in a short stack. As a consequence of the sealing concept of the stack two different bipolar plate types are needed. Therefore, the number of cells can only vary by 2 if the end plates are not changed. The single cell as well as the short stack is characterized by various methods, e.g. V–i characteristics, electrochemical impedance spectroscopy (EIS). As a result of the specific electrodes used the differential pressure between electrolyte and gas phase is limited to a few 10 mbar. At higher differential pressures gas crossover through the electrodes and electrolyte takes place with the result that the electrolyte may flood the flow fields. In contrast to PEFC, electrode supported by a metal net as conductor and mechanical support can be used in the AFC. Therefore, the structure of the flow field can be quite simple, this means flow fields with channels with large width and depth are possible. Consequently, the pressure loss over the flow field is very low. The single cell as well as the short stack was operated at overpressures of a few 10 mbar. The AFC can be operated without a compression but with a simple fan. The developed cell design is also used for the characterization of the fuel cell components like electrodes and diaphragms. The test facility for the single cell and for the stack is fully computer controlled and allows the variation of the operation conditions, e.g. flow of the electrolyte, hydrogen flow, oxygen or air flow and cell temperature.

Item URL in elib:https://elib.dlr.de/43864/
Document Type:Article
Title:Bipolar concept for alkaline fuel cells
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:February 2006
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2005.08.032
Page Range:pp. 1-7
Publisher:Elsevier Science Direct
Keywords:AFC, Fuel Cells, Stack
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Brennstoffe (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schulze, Dr.rer.nat. Mathias
Deposited On:27 Nov 2006
Last Modified:27 Apr 2009 12:56

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