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Evaluation of a 2.5 kWel automotive low temperature PEM fuel cell stack with extended operating temperature range up to 120 °C

Ruiu, Tiziana and Dreizler, Andreas and Mitzel, Jens and Gülzow, Erich (2016) Evaluation of a 2.5 kWel automotive low temperature PEM fuel cell stack with extended operating temperature range up to 120 °C. Journal of Power Sources, 303, pp. 257-266. Elsevier. DOI: 10.1016/j.jpowsour.2015.10.056 ISSN 0378-7753

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Official URL: http://www.sciencedirect.com/science/article/pii/S0378775315304432

Abstract

Nowadays, the operating temperature of polymer electrolyte membrane fuel cell stacks is typically limited to 80 °C due to water management issues of membrane materials. In the present work, short-term operation at elevated temperatures up to 120 °C and long-term steady-state operation under automotive relevant conditions at 80 °C are examined using a 30-cell stack developed at DLR. The high temperature behavior is investigated by using temperature cycles between 90 and 120 °C without adjustment of the gases dew points, to simulate a short-period temperature increase, possibly caused by an extended power demand and/or limited heat removal. This galvanostatic test demonstrates a fully reversible performance decrease of 21 ± 1% during each thermal cycle. The irreversible degradation rate is about a factor of 6 higher compared to the one determined by the long-term test. The 1200-h test at 80 °C demonstrates linear stack voltage decay with acceptable degradation rate, apart from a malfunction of the air compressor, which results in increased catalyst degradation effects on individual cells. This interpretation is based on an end-of-life characterization, aimed to investigate catalyst, electrode and membrane degradation, by determining hydrogen crossover rates, high frequency resistances, electrochemically active surface areas and catalyst particle sizes.

Item URL in elib:https://elib.dlr.de/103126/
Document Type:Article
Title:Evaluation of a 2.5 kWel automotive low temperature PEM fuel cell stack with extended operating temperature range up to 120 °C
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ruiu, TizianaTiziana.Ruiu (at) dlr.deUNSPECIFIED
Dreizler, AndreasAndreas.Dreizler (at) dlr.deUNSPECIFIED
Mitzel, JensJens.Mitzel (at) dlr.deUNSPECIFIED
Gülzow, ErichErich.Guelzow (at) dlr.deUNSPECIFIED
Date:30 January 2016
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:303
DOI :10.1016/j.jpowsour.2015.10.056
Page Range:pp. 257-266
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:PEMFC stack, thermal cycling, long-term test, end-of-life characterization, degradation phenomena
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Ruiu, Dr. Tiziana
Deposited On:23 Feb 2016 09:48
Last Modified:23 Feb 2016 09:48

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