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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

  • 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 forThe 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.show moreshow less

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Metadaten
Author:Cheng Bao, Wolfgang G. BesslerORCiDGND
Publisher:Elsevier
Year of Publication:2015
Language:English
GND Keyword:Brennstoffzelle; Durchfluss; Polymere
Parent Title (English):Journal of Power Sources
Volume:278
ISSN:1873-2755 (Online)
ISSN:0378-7753 (Print)
First Page:675
Last Page:682
Document Type:Article (reviewed)
Institutes:Bibliografie
Release Date:2017/06/12
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1016/j.jpowsour.2014.12.045