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Research Papers

A Transient Fuel Cell Model to Simulate HTPEM Fuel Cell Impedance Spectra

[+] Author and Article Information
Jakob Rabjerg Vang1

Department of Energy Technology,  Aalborg University, Aalborg East, 9220, Denmarkjrv@et.aau.dk

Søren Juhl Andreasen

Department of Energy Technology,  Aalborg University, Aalborg East, 9220, Denmarksja@et.aau.dk

Søren Knudsen Kær

Department of Energy Technology,  Aalborg University, Aalborg East, 9220, Denmarkskk@et.aau.dk

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(2), 021005 (Mar 19, 2012) (9 pages) doi:10.1115/1.4005609 History: Received September 02, 2011; Revised October 13, 2011; Published March 07, 2012; Online March 19, 2012

This paper presents a spatially resolved transient fuel cell model applied to the simulation of high temperature PEM fuel cell impedance spectra. The model is developed using a 2D finite volume method approach. The model is resolved along the channel and across the membrane. The model considers diffusion of cathode gas species in gas diffusion layers and catalyst layer, transport of protons in the membrane and the catalyst layers, and double layer capacitive effects in the catalyst layers. The model has been fitted simultaneously to a polarization curve and to an impedance spectrum recorded in the laboratory. A simultaneous fit to both curves is not achieved. In order to investigate the effects of the fitting parameters on the simulation results, a parameter variation study is carried out. It is concluded that some of the fitting parameters assume values which are not realistic. In order to remedy this, phenomena neglected in this version of the model must be incorporated in future versions.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Computational domain of the model

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Figure 2

Simplification of the flow field

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Figure 3

Single cell test setup

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Figure 4

The polarization curve generated by the fitted steady state model compared to experimental data

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Figure 5

The impedance spectrum generated by the fitted dynamic model compared to experimental data

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Figure 6

Impact of exchange current density variations on the polarization curve

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Figure 7

Impact of exchange current density variations on the impedance spectrum

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Figure 8

Impact of anode double layer capacitance variations on the impedance spectrum

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Figure 9

Impact of cathode double layer capacitance variations on the impedance spectrum

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Figure 15

Impact of ionic conductivity variations on the impedance spectrum

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Figure 10

Impact of CL PBI fraction variations on the polarization curve

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Figure 11

Impact of CL PBI fraction variations on the impedance spectrum

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Figure 12

Impact of porosity variations on the polarization curve

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Figure 13

Impact of porosity variations on the impedance spectrum

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Figure 14

Impact of ionic conductivity variations on the polarization curve

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