Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

Pierre-Marie Geffroy; Mickaël Reichmann; Laureline Kilmann; Jenny Jouin; N. Richet; Thierry Chartier

Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

Pierre-Marie Geffroy ^{1, *} Mickaël Reichmann ¹ Laureline Kilmann ¹ Jenny Jouin ² N. Richet ³ Thierry Chartier ¹

* Auteur correspondant

1 Axe 1 : procédés céramiques

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

2 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

3 CRCD - Centre de Recherche Claude Delorme [Jouy-en-Josas]

Abstract : La(1−x)SrxFe(1−y)GayO3−δ perovskites are some of the most promising materials for oxygen transport membranes due to their high oxygen semi-permeation and good chemical stability at high temperature under a wide range of oxygen partial pressures (from 0.21 to 10−19 atm.). This paper is focused on a better understanding of the influence of the Ga and Sr substitution ratios in the La(1−x)SrxFe(1−y)GayO3−δ perovskite series on oxygen semi-permeation performances, oxygen diffusion and surface exchange coefficients. This study identifies the optimal compositions of the La(1−x)SrxFe(1−y)GayO3−δ perovskite series. In addition, this study shows that the rate-determining step of oxygen transport through the membrane depends strongly on the Ga and Sr substitution ratios.

Keywords : Perovskite Oxygen semi-permeation Oxygen diffusion coefficient Oxygen surface exchange coefficient Rate-determining step

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-01097213
Contributeur : Pamela Bathias <>
Soumis le : vendredi 19 décembre 2014 - 10:35:06
Dernière modification le : mercredi 14 février 2018 - 16:21:48

Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

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Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

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