Oxygen diffusion, surface exchange and oxygen semi-permeation performances of Ln2NiO4 δ membranes Ln = La, Pr and NdReport as inadecuate




Oxygen diffusion, surface exchange and oxygen semi-permeation performances of Ln2NiO4 δ membranes Ln = La, Pr and Nd - Download this document for free, or read online. Document in PDF available to download.

1 Axe 1 : procédés céramiques SPCTS - Science des Procédés Céramiques et de Traitements de Surface 2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Abstract : In order to clearly identify the rate determining step rds in oxygen semi-permeation of dense Ln2NiO4+δ membranes with Ln = La, Pr and Nd, a specific setup has been designed, which allowed measuring the oxygen semi-permeation flux as well as the oxygen activity gradient at both membrane surfaces. From the results of the measurements, the coefficients of oxygen diffusion and surface exchange at both membrane surfaces have been determined. Their values have been compared with the values reported in the literature for similar membrane materials. The main conclusion is that the oxygen flux through these membranes is limited by the oxygen surface exchange at the oxygen-lean face, and not, as previously claimed, by oxygen volume diffusion.

Keywords : Oxygen diffusion Oxygen surface exchange Oxygensemi-permeation Lanthanum nickelate





Author: Pierre-Marie Geffroy - Mickaël Reichmann - Thierry Chartier - Jean-Marc Bassat - Jean-Claude Grenier -

Source: https://hal.archives-ouvertes.fr/



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