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Two-dimensional modeling of a polymer electrolyte membrane fuel cell with long flow channel. Part II. Physics-based electrochemical impedance analysis

Bao, Chen and Bessler, Wolfgang G. (2015) Two-dimensional modeling of a polymer electrolyte membrane fuel cell with long flow channel. Part II. Physics-based electrochemical impedance analysis. Journal of Power Sources, 278, pp. 675-682. Elsevier. DOI: [10.1016/j.jpowsour.2014.12.045] ISSN 0378-7753

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Official URL: http://www.journals.elsevier.com/journal-of-power-sources/

Abstract

The state-of-the-art electrochemical impedance spectroscopy (EIS) calculations have not yet started from fully multi-dimensional modeling. For a polymer electrolyte membrane fuel cell (PEMFC) with long flow channel, the impedance plot shows a multi-arc characteristic and some impedance arcs could merge. By using a step excitation/Fourier transform algorithm, an EIS simulation is implemented for the first time based on the full 2D PEMFC model presented in the first part of this work. All the dominant transient behaviors are able to be captured. A novel methodology called ‘configuration of system dynamics’, which is suitable for any electrochemical system, is then developed to resolve the physical meaning of the impedance spectra. In addition to the high-frequency arc due to charge transfer, the Nyquist plots contain additional medium/low-frequency arcs due to mass transfer in the diffusion layers and along the channel, as well as a low-frequency arc resulting from water transport in the membrane. In some case, the impedance spectra appear partly inductive due to water transport, which demonstrates the complexity of the water management of PEMFCs and the necessity of physics-based calculations.

Item URL in elib:https://elib.dlr.de/99160/
Document Type:Article
Title:Two-dimensional modeling of a polymer electrolyte membrane fuel cell with long flow channel. Part II. Physics-based electrochemical impedance analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bao, Chenbao.chen (at) dlr.deUNSPECIFIED
Bessler, Wolfgang G.wolfgang.bessler (at) dlr.deUNSPECIFIED
Date:2015
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:278
DOI :[10.1016/j.jpowsour.2014.12.045]
Page Range:pp. 675-682
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:Polymer electrolyte membrane fuel cell (PEMFC) Electrochemical impedance spectroscopy (EIS) Configuration of system dynamics
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: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:09 Dec 2015 09:40
Last Modified:31 Jul 2019 19:56

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