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Evaluation of reversible and irreversible degradation rates of polymer electrolyte membrane fuel cells tested in automotive conditions

Gazdzicki, Pawel and Mitzel, Jens and Garcia Sanchez, Daniel and Schulze, Mathias and Friedrich, K. Andreas (2016) Evaluation of reversible and irreversible degradation rates of polymer electrolyte membrane fuel cells tested in automotive conditions. Journal of Power Sources, 327, pp. 86-95. Elsevier. DOI: 10.1016/j.jpowsour.2016.07.049 ISSN 0378-7753

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2016.07.049

Abstract

This work provides single cell durability tests of membrane electrode assemblies in dynamic operation regularly interrupted by recovery procedures for the removal of reversible voltage losses. Degradation rates at different loads in one single test can be determined from these tests. Hence, it is possible to report degradation rates versus current density instead of a single degradation rate value. A clear discrimination between reversible and irreversible voltage loss rates is provided. The irreversible degradation rate can be described by a linear regression of voltage values after the recovery steps. Using voltage values before refresh is less adequate due to possible impacts of reversible effects. The reversible contribution to the voltage decay is dominated by an exponential decay after restart, eventually turning into a linear one. A linear-exponential function is proposed to fit the reversible voltage degradation. Due to this function, the Degradation behavior of an automotive fuel cell can be described correctly during the first hours after restart. The fit parameters decay constant, exponential amplitude and linear slope are evaluated. Eventually, the reasons for the voltage recovery during shutdown are analyzed showing that ionomer effects in the catalyst layer and/or membrane seem to be the key factor in this process.

Item URL in elib:https://elib.dlr.de/105216/
Document Type:Article
Title:Evaluation of reversible and irreversible degradation rates of polymer electrolyte membrane fuel cells tested in automotive conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861
Mitzel, JensJens.Mitzel (at) dlr.deUNSPECIFIED
Garcia Sanchez, Danieldaniel.garciasanchez (at) dlr.deUNSPECIFIED
Schulze, Mathiasmathias.schulze (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:21 July 2016
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:327
DOI :10.1016/j.jpowsour.2016.07.049
Page Range:pp. 86-95
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:Polymer electrolyte membrane fuel cell Automotive Durability Irreversible degradation Reversible degradation Performance recovery
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: Gazdzicki, Dr. Pawel
Deposited On:27 Jul 2016 11:20
Last Modified:31 Jul 2019 20:02

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