Symmetric and asymmetric membranes based on La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite with high oxygen semipermeation flux performances and identification of the rate-determining step of oxygen transport

Eva Deronzier (1) , Thierry Chartier (1) , Pierre-Marie Geffroy (1) , P.-M Geffroy (1)

1 IRCER-AXE1 - IRCER - Axe 1 : procédés céramiques

This work focuses on identifying the rate-determining step of oxygen transport through La0.5Sr0.5Fe0.7Ga0.3O3-δ membranes with symmetric and asymmetric architectures. The best oxygen semipermeation fluxes are 3.4 10−3 mol. m-2.s-1 and 6.3 10−3 mol. m-2.s-1 at 900 °C for the symmetric membrane and asymmetric membrane with a modified surface. The asymmetric membrane with a modified surface leads to an increase of approximately 7 times the oxygen flux compared to that obtained with the La0.5Sr0.5Fe0.7Ga0.3O3-δ dense membrane without surface modification. This work also shows that the oxygen flux is mainly governed by gaseous oxygen diffusion through the porous support of asymmetric La0.5Sr0.5Fe0.7Ga0.3O3-δ membranes.

Mots clés: Oxygen semipermeation; LSFGa5573 perovskite membrane; BSF55 coating; Oxygen diffusion; Porous layer

Domaines: Matériaux

Eva Deronzier, Thierry Chartier, Pierre-Marie Geffroy, P.-M Geffroy. Symmetric and asymmetric membranes based on La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite with high oxygen semipermeation flux performances and identification of the rate-determining step of oxygen transport. Journal of the European Ceramic Society, 2021, 41 (13), pp.6596-6605. ⟨10.1016/j.jeurceramsoc.2021.05.060⟩. ⟨hal-03370894⟩