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Experimental investigation of current density distribution in polymer electrolyte fuel cells

Schönbauer, Stefan und Sander, Heinz (2005) Experimental investigation of current density distribution in polymer electrolyte fuel cells. In: Conference proceedings. 3rd European PEFC Forum, 2005-07-04 - 2005-07-08, Lucerne, Switzerland.

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Kurzfassung

During fuel cell operation the electrochemical activity over the electrode area is not homogeneous in most cases. This may be due to a non-uniform water content in the membrane, an inhomogeneous temperature distribution, and reactant gradients in the cell. Consequently a variation of the current density over the cell area occurs which tends to result in inferior performance. For in situ measurements of the current density distribution in fuel cell stacks a segmented bipolar plate was developed. The segmented bipolar plate was first tested in single cells with stack endplates to verify the function of all components. The tests showed that the measurement tool works very reliable and accurate. The insight in an operating fuel cell stack via current density distribution measurement is very helpful to investigate interactions between cells. Results can be used to validate models and to optimise stack components, e.g. flow field and manifold design, as well as to detect the best stack operating conditions. By applying segmented bipolar plates as sensor plates for stack system controls an improved performance, safe operation and longer life cycles can be achieved. The developed segmented bipolar plates with integrated current sensors were used to assemble a short stack consisting of 3 cells; each of them having an active area of 25cm2 divided into 49 segments. The design of the bipolar plate proofed very suitable for easy assembling of single cells and stacks. First measurement results show that different current distributions can appear in the cells and these can vary from cell to cell, depending on the operating conditions of the stack. Electrical coupling between the cells was investigated and found to be only marginal for the assembly used.

elib-URL des Eintrags:https://elib.dlr.de/47570/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Experimental investigation of current density distribution in polymer electrolyte fuel cells
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schönbauer, StefanNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sander, HeinzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Juli 2005
Erschienen in:Conference proceedings
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Polymer electrolyte fuel cells, PEFC, bipolar plate, current distribution
Veranstaltungstitel:3rd European PEFC Forum
Veranstaltungsort:Lucerne, Switzerland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:4 Juli 2005
Veranstaltungsende:8 Juli 2005
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung (alt)
HGF - Programmthema:E BZ - Brennstoffzellen (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E BZ - Brennstoffzellen
DLR - Teilgebiet (Projekt, Vorhaben):E - Membran-Brennstoffzellen (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Schönbauer, Stefan
Hinterlegt am:08 Mai 2007
Letzte Änderung:24 Apr 2024 19:09

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