Influence of Oxygen Surface Exchanges on OxygenSemi-Permeation through La(1−x)SrxFe(1−y)GayO3−δDense Membrane
Year: 2011
Type: article
Abstract: Because of high oxygen semi-permeation and very good chemical stability, La 0.8 Sr 0.2 Fe 0.7 Ga 0.3 O 3Àd perovskite is one of the most promising materials as a catalytic membrane reactor for hydrogen production.In this paper, oxygen semi-permeation of La 0.8 Sr 0.2 Fe 0.7 Ga 0.3 O 3Àd membranes with different architectures is studied over a large range of temperatures in order to identify the rate determining step of the oxygen flux through the membrane.We show that the oxygen flux through the membrane is governed by the surface exchanges on the membrane reducing face.Besides, these results are confirmed by potentiometric measurements of oxygen activity on both membrane faces under oxygen partial pressure gradient.Finally, new architectures with La 0.8 Sr 0.2 Fe 0.7 Ni 0.3 O 3Àd porous catalytic layer on membrane reducing surface are tested to improve the performances of oxygen semi-permeation.
DOI: 10.1149/1.3597086
Authors: P. M. Geffroy, A. Vivet, J. Fouletier, N. Richet, P. Del Gallo, T. Chartier
Institutions: Centre National de la Recherche Scientifique, Centre Européen de la Céramique, Institut de Recherche sur les Céramiques, Université de Limoges, Air Liquide (France), Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces, Pôle de recherche et d'enseignement supérieur Université de Grenoble
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2019942867