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Mathieu BAUDY’s Thesis Defense

par Laurence Laffont - publié le

Mathieu BAUDY’s thesis defense, intitled "Étude et modélisation du vieillissement d’une pile à combustible à membrane échangeuse de protons haute température (HT-PEMFC)" (Study and Modeling of the Ageing of a High Temperature Proton Exchange Membrane Fuel Cell (HT-PEMFC)), will be held on Wednesday, June 8th at 1:30 pm, in salle des thèses C002 at ENSEEIHT.

Jury :
Mr Samir JEMEI : Professor, Université de Franche-Comté/FEMTO-ST, Belfort, Rapporteur
Mr Bruno AUVITY, Professor, Polytech Nantes/LTEN, Rapporteur
Mrs Deborah JONES, Research director, CNRS, Université de Montpellier/ICGM, Reviewer
Mr Loïc BOULON, Professor, Université du Québec/LABO Trois-Rivières, Reviewer
Mr Stéphane CHEVALIER, Senior Lecturer, Arts et Métiers ParisTech/ENSAM, Bordeaux, Reviewer
Mr Christophe TURPIN, Research Director, CNRS, Toulouse INP/LAPLACE, Thesis Supervizor
Mr Amine JAAFAR, Senior Lecturer, Toulouse INP/LAPLACE, Thesis Co-supervizor
Mr Sofyane ABBOU, PhD Safran Power Units, Toulouse, Industry Supervizor

Abstract :
The contribution of air transportation to global warming has been adjusted upwards by taking into account complementary emissions to those direct from CO2. The main aircraft manufacturers are forecasting significant growth in air traffic, which will require the doubling of the current fleet of aircraft by 2035.
Simultaneously, the entire sector has committed to reducing its emissions. This is the context for the PIPAA (PIle à combustible Pour Applications Aéronautiques) project, which is being led by SAFRAN Power Units and includes four thesises studying the potential of the high-temperature proton exchange membrane fuel cell (HT-PEMFC) for the aviation sector. The final goal of this set of studies is to provide a better understanding of the phenomena that characterize the HT-PEMFC in order to integrate it into an autonomous on-board electrical generation system for business aircraft.
The work conducted during this thesis concerns HT-PEMFC single cells and is a direct continuation of Sylvain Rigal’s thesis on the modeling and ageing of the HT-PEMFC.
The main objective of this work is to quantify the degradation that the characterization phases of the fuel cell, in particular the polarization curve, could bring during ageing campaigns. The work consists in identifying the degrading phenomena caused during this type of characterization and to propose a non-degrading methodology of realization of the polarization curves in HT-PEMFC. In this sense, an experimental campaign of current profile cycling in order to produce polarization curves was realized. It enabled to understand the potential degradations likely to occur during these characterizations.
In order to allow a reliable comparison of the results, a study on the sensitivity of the voltage to the atmospheric pressure was conducted and its impact on the analyses was demonstrated. Two proposals of readjustment methodologies of the tension to the operating conditions were then analyzed and applied. Other complementary modelling work was also pursued. In addition to the previous approach and following a reliability of the test equipment and the implementation of new operating modes during this thesis, perspectives on the calendar ageing and on the interpretation of electrochemical impedance spectroscopies were proposed.