2016 12 09 O. Celikbileka Thesis defense - Grenoble INP

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2016 12 09 O. Celikbileka Thesis defense
INSTITUTIONS
Publié le December 5, 2016
Date de l'évènement : December 9, 2016
Ozden Celikbileka a le plaisir de vous inviter a sa soutenance de thèse
qui se déroulera le vendredi 9 décembre a 14h dans l'amphithéâtre Jean
Besson (Phelma campus). La soutenance sera suivie d'un pot en salle
C012.
Grenoble
Institute of
Technology
CNRS
Université
Grenoble Alpes
University of
Savoie
CONTACT
Optimisation de la cathode pour pile à combustible à oxyde électrolyte
solide : approches expérimentale et numérique
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GRENOBLE
Jury:
Mme, Marie-Cécile PERA
Professeur, Université de Franche-Comté, Président
M. Stephen SKINNER
Professeur, Imperial College London, Rapporteur
M. Olivier JOUBERT
Professeur, Ecole Polytechnique de l'Université de Nantes, Rapporteur
M. Norbert H. MENZLER
Docteur, Forschungszentrum Jülich, Membre
M. David JAUFFRÈS
Maître de conférence, Université Grenoble Alpes, Co-encadrant
Mme Mónica BURRIEL
Chargée de Recherche, CNRS, Université Grenoble Alpes, Co-encadrant
M. Christophe L. MARTIN
Directeur de Recherche CNRS, Université Grenoble Alpes, Co-directeur
Mme Elisabeth DJURADO
Professeur, Université Grenoble Alpes, Directeur
Abstract
Understanding, controlling and optimizing the mechanism of oxygen reduction reaction at the
cathode need to be addressed for high performance energy conversion devices such as solid
oxide fuel cells (SOFCs). Structured porous films of mixed ionic electronic conductors
(MIECs) and their composites with addition of a pure ionic conductor offer unique properties.
However, correlating the intrinsic properties of electrode components and microstructural
features to performance remains a challenging task. In this PhD thesis, cathode functional
layers (CFL) of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and LSCF/Ce0.9Gd0.1O2- (CGO)
composite cathodes with hierarchical porosity from nano- to micro-range are fabricated by
electrostatic spray deposition technique. The films were topped with LSCF as a current
collecting layer (CCL) by screen printing technique. A parametric optimization study was
conducted experimentally in terms of sintering temperature, composition, and thickness of
CFL and CCL layers. The experimental results were supported by a numerical 3D Finite
Element Model (FEM). Microstructural parameters determined by FIB-SEM tomography were
used in a simple geometry similar to experimentally observed columnar features. In this work,
experimental results and modelling were combined to provide design guidelines relating
optimized electrochemical performances to the microstructure and bulk material properties. A
complete fuel cell with optimized cathode film was tested in long term degradation in real
SOFC operational conditions.
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