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APPROCHES EXPERIMENTALES ET ANALYSE PROBABILISTE POUR LE DIAGNOSTIC DE PILES A COMBUSTIBLE DE TYPE PEM.

Abstract : The lifetime expectancy and the reliability of Fuel Cell generators (FC) equipped with polymer membranes are major topics for the marketing of this technology in the transport sector. However, the constraint of the lifetime could be overcome by preventive maintenance procedure which would allow detecting at which moment the fuel cell elements must be changed. The actual need of high-voltage acquisition systems for the characterization of FC power generators has led to the development of a high-voltage multiways impedance spectrometer. This new acquisition system includes 31 ways dedicated to the cell(s) voltage recording. Voltage measurement can be realized up to 1000 (ou 700 Vrms). Various tests have been performed on different FC stacks operated in normal and degrading conditions according to an appropriate experimental design. Some Bayesian networks have been used to analyze the experimental data collected through Electrochemical Impedance Spectroscopy (EIS) and to diagnose the FC stack behavior. This approach consists in discerning seven operating modes (including six failures modes) which are the most frequently encountered during FC lifetime. The Bayesian methodology has shown excellent performances and capabilities to ensure efficient FC diagnosis. A 98,5 % rate of good fault classification was reached in the experimental design applied. In addition to the work done on the EIS basis, two electroanalytical methods (linear sweep voltammetry and cyclic voltammetry) until now reserved to the study of single cells were adapted to the FC stack analysis. The linear sweep voltammetry has been used to detect any hydrogen permeability through the FC membranes. The fuel crossover is actually an excellent indicator of the FC state-of-health. Cyclic voltammetry was used to characterize the true electrochemical active area at the FC electrodes. Finally, the gas crossover trough the membrane(s) has also been highlighted using a home-made experimental method. This test procedure includes some pressure and electrical measurements to detect any failing cell(s) inside the FC assembly. This Ph.D work is a contribution to the PAN-H ANR DIAPASON project (FC diagnosis methods for vehicle and stationary applications without intrusive sensors).
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Contributor : Sébastien Wasterlain <>
Submitted on : Monday, April 19, 2010 - 5:36:51 PM
Last modification on : Thursday, November 12, 2020 - 9:42:08 AM
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  • HAL Id : tel-00474356, version 1

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Sébastien Wasterlain. APPROCHES EXPERIMENTALES ET ANALYSE PROBABILISTE POUR LE DIAGNOSTIC DE PILES A COMBUSTIBLE DE TYPE PEM.. Sciences de l'ingénieur [physics]. Université de Franche-Comté, 2010. Français. ⟨tel-00474356⟩

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