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Influence of nature and concentration of iron ions on the degradation of PEMFCs: a modeling study

Coulon, Romain and Franco, A. A. and Bessler, Wolfgang G. (2011) Influence of nature and concentration of iron ions on the degradation of PEMFCs: a modeling study. In: Conference Proceedings, pp. 56-66. European Fuel Cell Forum AG. European Fuel Cell Forum 2011, 28 June -1 July 2011, Lucerne Switzerland.

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Abstract

Polymer Electrolyte Membrane (PEM) Fuel Cells represent a promising technology for high-efficiency energy conversion as an alternative to fossil energies. However, under practical operating conditions, the durability of the current technology is not high enough yet to be economically viable. Modeling is becoming a more and more important tool for understanding degradation mechanisms and predicting the lifetime of fuel cells. For this goal, we apply multiphysics elementary kinetic models that describe electrochemical reactions and transport processes in a highly detailed way. This allows a reliable prediction of the long-time behavior of the cell, which always involves temporal extrapolation away from short-term measurements. This presentation deals with a 1D model of the PEM chemical aging, which represents one of the major mechanisms inducing irreversible PEMFC performance decay. The model describes water, gas and ion transport across the PEM, production of hydrogen peroxide in the anode CL, transport of peroxide into the PEM, its decomposition, and chemical degradation of the PEM through radicals attack. Parameter identification and model validation is performed using published experimental work from several groups. It has been observed experimentally by Kodama et al. that the degradation rate depends nonlinearly on the concentration of iron ions in the membrane. Particularly, under very aggressive conditions the membrane degradation is not as high as expected. This study shows a model-based analysis of the influence of ion concentration on the degradation rate. The different effects of Fe2+ and Fe3+ are quantified.

Item URL in elib:https://elib.dlr.de/72794/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Influence of nature and concentration of iron ions on the degradation of PEMFCs: a modeling study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Coulon, RomainRomain.Coulon (at) dlr.deUNSPECIFIED
Franco, A. A.UNSPECIFIEDUNSPECIFIED
Bessler, Wolfgang G.Wolfgang.Bessler (at) dlr.deUNSPECIFIED
Date:30 June 2011
Journal or Publication Title:Conference Proceedings
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 56-66
Editors:
EditorsEmail
Friedrich, A.UNSPECIFIED
Bessler, W. G.UNSPECIFIED
Schiller, G.UNSPECIFIED
Wagner, N.UNSPECIFIED
Publisher:European Fuel Cell Forum AG
Status:Published
Keywords:Polymer Electrolyte Membrane, Modeling Study, Fuel Cell
Event Title:European Fuel Cell Forum 2011
Event Location:Lucerne Switzerland
Event Type:international Conference
Event Dates:28 June -1 July 2011
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Yurkiv, Vitaliy
Deposited On:13 Dec 2011 11:11
Last Modified:31 Jul 2019 19:34

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