Effect of cation substitution at the B site on the oxygen semi-permeation flux in La0.5Ba0.5Fe0.7B0.3O3−δ dense perovskite membranes with B = Al, Co, Cu, Mg, Mn, Ni, Sn, Ti and Zn (part II)

Mickaël Reichmann (1) , Pierre-Marie Geffroy (1) , J. Fouletier (2) , N. Richet (3) , P. del Gallo (3) , Thierry Chartier (1)

1 SPCTS-AXE1 - Axe 1 : procédés céramiques
2 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
3 CRCD - Centre de Recherche Claude Delorme [Jouy-en-Josas]

The aim of this paper is to provide insight into the effect of cation substitution at the B site on the oxygen semi-permeation performances. Particular attention is given here to identify the impact of cation substitution at the B site on oxygen diffusion and oxygen surface-exchange kinetics in the La0.5Ba0.5Fe0.7B0.3O3−δ perovskite membrane series with B = Al, Co, Cu, Mg, Mn, Ni, Sn, Ti and Zn. This study clearly shows that the prediction of the oxygen semi-permeation performances of membrane materials from the nature of cation at the A or B sites in perovskite structure is quite complex. The cation substitution at the B-site has a low impact on the nature of rate-determining step and a significant impact on oxygen semi-permeation performances, contrary to the cation substitution at A-site. Unfortunately, it is not possible to establish a relevant trend about the effect of the nature of cation in the A or B sites in perovskite structure on oxygen diffusion and the oxygen surface-exchange kinetics.

Mots clés: Oxygen surface exchange; Bulk diffusion; Oxygen semi-permeation; Rate-determining step

Domaines: Matériaux

Mickaël Reichmann, Pierre-Marie Geffroy, J. Fouletier, N. Richet, P. del Gallo, et al.. Effect of cation substitution at the B site on the oxygen semi-permeation flux in La0.5Ba0.5Fe0.7B0.3O3−δ dense perovskite membranes with B = Al, Co, Cu, Mg, Mn, Ni, Sn, Ti and Zn (part II). Journal of Power Sources, 2015, 277, pp.17-25. ⟨10.1016/j.jpowsour.2014.12.012⟩. ⟨hal-01115791⟩