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Development and Characterization of a LT-PEM Fuel Cell Stack with Wide Operating Temperature Range up to 120 °C

Ruiu, Tiziana and Dreizler, Andreas and Mitzel, Jens and Gülzow, Erich (2015) Development and Characterization of a LT-PEM Fuel Cell Stack with Wide Operating Temperature Range up to 120 °C. 6th International Conference on ”Fundamentals & Development of Fuel Cells” - FDFC2015, 03.-05. Feb. 2015, Toulouse, Frankreich.

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Abstract

The typical operating temperature range of a polymer electrolyte membrane fuel cell (PEMFC) stack for automotive application lies between –20 °C and 80 °C [1,2]. Nevertheless, the feasibility to operate in a broader temperature range can be of particular relevance to meet specific environmental or operative conditions. Two possible scenarios include vehicles running in hot areas like deserts, and long uphill drive (e.g. during mountain driving), which require higher power with simultaneous slow average speed, and thus with minimized air cooling. 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 for the stack to temporarily operate at higher temperature, would also 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 wide operating temperatures, we performed a series of 20 temperature cycles from 90 to 120 °C, operating in galvanostatic conditions at a controlled current of 70 A (0.5 A/cm2), that correspond to an electrical stack power output of approx. 1.5 kW. The results are promising, since only a slight stack voltage decrease was observed during the thermal cyclization. Furthermore, the results of a 1200 h long-term stability test are shown, together with an end-of-life electrochemical characterization (cyclic voltammetry and hydrogen crossover measurements) performed on all the cells. The electrochemical analysis can help to identify the main stressors responsible for the observed stack performance loss. Therefore, the catalyst, electrode and membrane degradation are examined by the determination of hydrogen crossover rates, electrochemically active surface areas (EASAs) and electrical short-circuit resistances of each cell. REFERENCES [1] Wu J.F., Yuan X.Z., Martin J.J., Wang H.J., Zhang J.J., Shen J., Wu S.H., Merida W., 2008, A review of PEM fuel cell durability: Degradation mechanisms and mitigation strategies, J. Power Sources, vol. 184, n° 1: pp. 104-119.[2] Schießwohl E., von Unwerth T., Seyfried F., Brüggemann D., 2009, Experimental investigation of parameters influencing the freeze start ability of a fuel cell system, J. Power Sources, vol. 193, n° 1: pp. 107-115.

Item URL in elib:https://elib.dlr.de/95594/
Document Type:Conference or Workshop Item (Poster)
Title:Development and Characterization of a LT-PEM Fuel Cell Stack with Wide 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:February 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEMFC Stack, Extended Temperature Range, Thermal Cycling, Long-term Test, End-of-Life Characterization
Event Title:6th International Conference on ”Fundamentals & Development of Fuel Cells” - FDFC2015
Event Location:Toulouse, Frankreich
Event Type:international Conference
Event Dates:03.-05. Feb. 2015
Organizer:Institut National Polytechnique de Toulouse (University of Toulouse)
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Ruiu, Dr. Tiziana
Deposited On:19 Mar 2015 10:28
Last Modified:19 Mar 2015 10:28

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