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A PEMFC Stack with Extended Operating Temperature Range up to 120 °C

Dreizler, Andreas und Ruiu, Tiziana und Mitzel, Jens und Gülzow, Erich (2014) A PEMFC Stack with Extended Operating Temperature Range up to 120 °C. Electrochemistry 2014, 2014-09-22 - 2014-09-24, Mainz, Deutschland.

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Kurzfassung

The normal operating temperature range of a polymer electrolyte membrane fuel cell (PEMFC) stack for automotive application lies between –20 °C and 80 °C. Safe freeze start should be possible down to –30 °C [1], while the start-up time of the fuel cell vehicle should be clearly shorter than a minute, or better just a few seconds. However, in most climatic regions the temperature stability of the stack at higher temperatures is even more interesting to be explored, in order to meet specific environmental or operative conditions. The work presented here concerns the characterization of a 30-cell PEMFC stack developed at the German Aerospace Center designed for operation in an extended temperature range up to 120 °C. The feasibility to operate in a broader temperature range can be of particular relevance in two possible scenarios, represented by vehicles running in hot areas like deserts, or by long uphill drive (e.g. during mountain driving) that requires higher power with simultaneous slow average speed, and thus with minimized air cooling. This would contribute to the improvement of cooling system components with scaled down dimensions, which in turn would lead to a reduced vehicle weight and thus to an overall lower fuel consumption. In this contribution we present the current-voltage characteristic curves measured on the 30-cell stack and the homogeneity obtained along the cells. Moreover, in order to investigate the stack behaviour at extended operating temperatures, we performed a series of 20 temperature cycles from 90 to 120 °C, operating at a galvanostatic controlled current of 70 A, that corresponded to an electrical stack power output of approx. 1.5 kW. The results are promising, since only a slight stack voltage decrease was observed. Furthermore, the results of a 1000 h long-term stability test are shown, whose focus lies on the evaluation of the possible lifetime and the related overall cells degradation. Literature: [1] E. Schießwohl et al., J. Power Sources 2009, 193, 107-115.

elib-URL des Eintrags:https://elib.dlr.de/92435/
Dokumentart:Konferenzbeitrag (Poster)
Titel:A PEMFC Stack with Extended Operating Temperature Range up to 120 °C
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Dreizler, AndreasAndreas.Dreizler (at) dlr.dehttps://orcid.org/0000-0003-2681-6350NICHT SPEZIFIZIERT
Ruiu, TizianaTiziana.Ruiu (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mitzel, JensJens.Mitzel (at) dlr.dehttps://orcid.org/0000-0001-8137-9689NICHT SPEZIFIZIERT
Gülzow, ErichErich.Guelzow (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:22 September 2014
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:fuel cell, fuel cell stack, pemfc stack, stack development, water management
Veranstaltungstitel:Electrochemistry 2014
Veranstaltungsort:Mainz, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:22 September 2014
Veranstaltungsende:24 September 2014
Veranstalter :Gesellschaft Deutscher Chemiker (GDCh)
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung und Nutzung (alt)
HGF - Programmthema:Brennstoffzelle (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Dreizler, Dr. Andreas
Hinterlegt am:26 Nov 2014 10:14
Letzte Änderung:24 Apr 2024 19:58

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