Skip to Main content Skip to Navigation
Theses

Réactivité interfaciale des composés à base de CeO2 dans des dispositifs électrochimiques hybrides fonctionnant à haute température

Abstract : This study deals with high-temperature fuel cells that differ in the nature of the electrolyte: solid oxide (SOFC) and molten carbonates (MCFC). Despite the current maturity of these technologies, the high temperature degradation of materials slows down large-scale development. We mainly focused on the evolution of SOFC systems. This work investigates first the deposition of atomic layers (ALD) of cerium oxide doped with yttrium (known for its electrocatalytic properties at the anode) and their electrochemical characterization, in order to show the influence of their microstructure on the reactivity under a reducing atmosphere of hydrogen. The orientation of these layers showed a significant increase in their reactivity. In a second time we studied composite electrolytes oxide-carbonates and, more particularly, the evolution of their electrical behavior under different experimental conditions approaching the operation of the SOFC. We have been able to deduce the mechanisms governing the ionic conductivity under various atmospheres and highlighted the interest of a thin layer between anode and electrolyte in a single cell. In both cases, very significant results have been obtained allowing SOFC / MCFC hybrid systems, including highly oriented thin films, to be considered as competitors with existing devices.
Document type :
Theses
Complete list of metadata

https://pastel.archives-ouvertes.fr/tel-03203106
Contributor : ABES STAR :  Contact
Submitted on : Tuesday, April 20, 2021 - 3:22:09 PM
Last modification on : Sunday, June 26, 2022 - 3:07:34 AM

File

2019PSLEC002_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-03203106, version 1

Collections

Citation

André Grishin. Réactivité interfaciale des composés à base de CeO2 dans des dispositifs électrochimiques hybrides fonctionnant à haute température. Autre. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEC002⟩. ⟨tel-03203106⟩

Share

Metrics

Record views

115

Files downloads

33