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Technical Briefs

A New High Voltage Impedance Spectrometer for the Diagnostics of Fuel Cell Stacks

[+] Author and Article Information
Sébastien Wasterlain

FC LAB, Techn’Hom, Rue Thierry Mieg, 90010 Belfort Cedex, France; FEMTO-ST (UMR CNRS 6174), Department of ENISYS,University of Franche-Comtésebastien.wasterlain@utbm.fr

Fabien Harel

FC LAB, Techn’Hom, Rue Thierry Mieg, 90010 Belfort Cedex, France;INRETS, The French National Institute for Transport and Safety Researchfabien.harel@inrets.fr

Denis Candusso1

FC LAB, Techn’Hom, Rue Thierry Mieg, 90010 Belfort Cedex, France;INRETS, The French National Institute for Transport and Safety Researchdenis.candusso@inrets.fr

Daniel Hissel

FC LAB, Techn’Hom, Rue Thierry Mieg, 90010 Belfort Cedex, France; FEMTO-ST (UMR CNRS 6174), Department of ENISYS,University of Franche-Comtédaniel.hissel@univ-fcomte.fr

Xavier François

FC LAB, Techn’Hom, Rue Thierry Mieg, 90010 Belfort Cedex, France;UTBM–University of Technology Belfort Montbéliardxavier.francois@utbm.fr

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(2), 024502 (Dec 01, 2010) (6 pages) doi:10.1115/1.4002401 History: Received July 01, 2010; Revised July 20, 2010; Published December 01, 2010; Online December 01, 2010

This paper presents a novel architecture of an impedance spectrometer dedicated to the characterization and diagnostics of large fuel cell stacks operated in galvanostatic mode. The validation tests are first performed on a single proton exchange membrane fuel cell (PEMFC). Then, experiments are carried out on a 20-cell PEMFC stack delivering more significant power levels. The proposed impedancemeter allows spectrum measurements on cells located in the middle of the stack, where common mode potentials are usually too high for commercial devices. Moreover, the impedances of different individual cells in the stack are acquired with a synchronous measurement reference (global stack impedance). This capability allows distinguishing any singular cell behavior or drift effect of operational parameters (e.g., stack temperature and polarization current).

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Scheme of the experimental EIS measurement system

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Figure 2

Impedance spectroscopy measurement on a PEMFC stack

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Figure 3

Impedance spectra comparisons made with two different impedancemeters

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Figure 4

Acquisition system accuracy of our system for (a) single-cell impedance measurement and (b) 20-cell stack measurement. (c) Acquisition system accuracy of Solartron Modulab.

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Figure 5

Impedance results for (a) the individual cells and (b) the stack. Stationary conditions. Note that “stack9” (for instance) is the spectrum recorded at the stack boundaries during the spectrum acquisition on “cell9.”

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Figure 6

Impedance results for (a) the individual cells and (b) the stack. Nonstationary conditions. Note that “stack9” (for instance) is the spectrum recorded at the stack boundaries during the spectrum acquisition on “cell9.”

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