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Degradation behavior of PEMFC MEA under load cycling and constant operation conditions

Gama da Roch, Pedro Gomes Ferreira and Garcia Sanchez, Daniel and Gazdzicki, Pawel and Morawietz, Tobias and Hiesgen, Renate and Friedrich, Kaspar Andreas (2018) Degradation behavior of PEMFC MEA under load cycling and constant operation conditions. 69th ISE Annual Meeting, 02-07. Sep. 2018, Bologna, Italien.

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Abstract

Durability of automotive MEAs is usually studied using the FC-DLC protocol which corresponds to a test covering operation from OCV to high current densities. Hence, in such a test the impact of the different current density ranges on degradation is not distinguished. Therefore, in this study, individual degradation tests have been performed at low and high current density with and without additional cycling. The tests have been supported by current density distribution measurements to monitor local operation conditions and evaluate local degradation issues. Reversible as well as irreversible performance losses were studied by performing electrochemical analysis and subsequent ex-situ physico-chemical investigations. As degradation processes loss of proton conductivity and increase in charge transfer resistance was observed. ECSA losses were observed after all tests. Cycling at low current density leads to Pt dissolution and migration to the membrane. Interestingly, MEA areas exhibiting high local performance exhibit particularly high Pt concentration in the membrane. Under constant operation strong performance losses due to water management issues were observed associated to inhomogeneity of current density distribution along the flow field. Generally, cycling tests have shown lower degradation compared to constant current operation which is also linked to partial recovery of reversible degradation losses upon cycling conditions.

Item URL in elib:https://elib.dlr.de/122396/
Document Type:Conference or Workshop Item (Speech)
Title:Degradation behavior of PEMFC MEA under load cycling and constant operation conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gama da Roch, Pedro Gomes FerreiraDLRUNSPECIFIED
Garcia Sanchez, DanielDaniel.GarciaSanchez (at) dlr.deUNSPECIFIED
Gazdzicki, PawelPawel.Gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEMFC, Local current density, Degradation, load cycling
Event Title:69th ISE Annual Meeting
Event Location:Bologna, Italien
Event Type:international Conference
Event Dates:02-07. Sep. 2018
Organizer:ISE
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:29 Oct 2018 14:55
Last Modified:29 Oct 2018 14:55

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