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Mitigation of PEMFC Degradation upon Freeze-Thaw Cycling using a Methanol-Water Solution as Antifreeze

Knorr, Florian and Garcia Sanchez, Daniel and Schirmer, Johannes and Gazdzicki, Pawel and Friedrich, K. Andreas (2019) Mitigation of PEMFC Degradation upon Freeze-Thaw Cycling using a Methanol-Water Solution as Antifreeze. 8th International Conference on ”Fundamentals & Development of Fuel Cells FDFC2019, February 12th to February 14th, 2019, Nantes, Frankreich.

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Abstract

One of the challenges for PEMFCs for fuel cell electric vehicle is to ensure cold start capability and high durability under freeze-thaw (F/T) cycling. Today, polymer electrolyte fuel cells in automotive applications undergo gas purging conditioning to remove residual water from the cells before a cold shut-down to avoid damage due to freezing water. In this study, an alternative conditioning procedure is examined with an alcohol-water solution used as antifreeze. Since MEA components are not affected by the required methanol concentrations which have to be 40vol% to prevent water freezing at -30°C, methanol solutions have generally a great potential to be used as antifreeze in PEMFC. In order to demonstrate the suitability of methanol as antifreeze, F/T cycling tests have been performed using methanol as antifreeze and with conventional dry gas purging of the cell. The results clearly show that performance degradation upon freeze-thaw cycling, which is observed when applying dry gas purging before the tests, is mitigated when flooding the cell with the methanol solution. Specifically, using the antifreeze, performance losses are observed at high current densities only and the peak performance of the cell does not decrease. Moreover, cold stat-up procedures are examined to allow a start-up of the cell after flooding with the antifreeze. Even though the antifreeze exhibits superior properties regarding mitigation of degradation, the start-up of the cell is challenging due to methanol residues in the MEA components.

Item URL in elib:https://elib.dlr.de/126645/
Document Type:Conference or Workshop Item (Speech)
Title:Mitigation of PEMFC Degradation upon Freeze-Thaw Cycling using a Methanol-Water Solution as Antifreeze
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knorr, FlorianDLRUNSPECIFIED
Garcia Sanchez, DanielDaniel.GarciaSanchez (at) dlr.deUNSPECIFIED
Schirmer, Johannesjohannes.schirmer (at) dlr.deUNSPECIFIED
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2019
Refereed publication:Yes
Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEMFC, Durability, Cold Start-Up, Freeze-Thaw Cycling
Event Title:8th International Conference on ”Fundamentals & Development of Fuel Cells FDFC2019
Event Location:Nantes, Frankreich
Event Type:international Conference
Event Dates:February 12th to February 14th, 2019
Organizer:University of Nantes
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Gazdzicki, Dr. Pawel
Deposited On:22 Mar 2019 16:30
Last Modified:22 Mar 2019 16:30

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