Improvement of oxygen flux through perovskite membranes using a coating of ultra-divided particles

Laure Guironnet 1, 2 Pierre-Marie Geffroy 3 N. Richet 4 Thierry Chartier 3
1 SPCTS - Science des Procédés Céramiques et de Traitements de Surface
2 ADEME - Agence de l'Environnement et de la Maîtrise de l'Energie
3 SPCTS-AXE1 - Axe 1 : procédés céramiques
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
4 CRCD - Centre de Recherche Claude Delorme [Jouy-en-Josas]
Abstract : In the last decades, numerous mixed ionic and electronic conducting materials with a perovskite structure have been investigated for their potential applications as membrane materials for oxygen separation applications. This work shows that significant improvement of electrochemical properties of two perovskite materials, La0.6Sr0.4Fe0.8Co0.2O3-δ (LSFCo6482) and La0.5Sr0.5Fe0.7Ga0.3O3-δ (LSFG5573) is obtained using ultra-divided particles perovskite coating. This coating is obtained by dip-coating thanks to a derived sol-gel synthesis route. The ultra-divided particles have a grain size distribution from 300 to 500 nm. The oxygen flux measured using a specific setup shows that the oxygen surface exchange kinetics and bulk diffusion coefficient depend on the microstructure and the chemical composition of the coating material. The relation established between chemical formulation, microstructure, and oxygen flux were used to design optimized membranes.
Keywords : Perovskite ceramic membrane Mixed conductor Oxygen semi-permeation Surface exchange mechanism Bulk diffusion Coating
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https://hal-unilim.archives-ouvertes.fr/hal-01727656
Contributeur : Thierry Chartier <>
Soumis le : vendredi 9 mars 2018 - 14:04:11
Dernière modification le : mercredi 24 octobre 2018 - 07:46:02

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UNILIM | SPCTS | SPCTS-AXE1 | CNRS | ADEME | INC-CNRS | IPAM | IRCER | IRCER-AXE1

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Laure Guironnet, Pierre-Marie Geffroy, N. Richet, Thierry Chartier. Improvement of oxygen flux through perovskite membranes using a coating of ultra-divided particles. Chemical Engineering Science, Elsevier, 2016, 156, pp.128 - 135. ⟨10.1016/j.ces.2016.09.019⟩. ⟨hal-01727656⟩

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