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Elaboration, mise en forme et caractérisations de cellules électrochimiques convertissant l'énergie et fonctionnant à haute température (SOFC)

Abstract : The works presented concern in the realization of a third generation of SOFC cell. The main problem is the shaping process of the cell which must allows obtaining a dense (high temperature) electrolyte associated with a porous metal (low temperature). In order to solve this issue, we propose an innovative approach consisting in developing and shaping, at high temperature, a stack of oxide precursors which will be reduced in a second step at moderate temperature to generate the metal parts. The sol-gel route derived from the Pechini process, known to allow obtaining at low cost homogeneous samples of complex composition and controlled microstructure, was used to obtain the oxide precursors of the constituents of the cell. Their shaping was carried out by flash sintering, a technique selected for the speed of treatment allowing to control the densification, to preserve the microstructure and to limit the interfacial reactions during the assembly of different materials. The densification parameters and then the reduction conditions were optimized for each precursor before being transferred for the production of a half-cell. The departure of the oxygen results in an increase in the porosity without coalescence of the metal parts or detachment at the interfaces between constituents. Thus, the results presented validate the proposed approach showing the expected benefit of the use of oxide precursors allowing the dissociation of the shaping and densification step of the electrolyte from that of the obtaining of the porous metal. After carrying out the electrochemical tests on the half-cell, the full cell will be produced the upscaling, facilitated by the use of adequate chemical processes will be considered.
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Dalya Al-Kattan. Elaboration, mise en forme et caractérisations de cellules électrochimiques convertissant l'énergie et fonctionnant à haute température (SOFC). Matériaux. Université Paul Sabatier - Toulouse III, 2016. Français. ⟨NNT : 2016TOU30269⟩. ⟨tel-01692379⟩

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