Oxygen-permeating property of LaSrBFeO3 (B=Co, Ga) perovskite membrane surface-modified by LaSrCoO3

Shiwoo Lee, Kee Sung Lee, Sang Kook Woo, Jong Won Kim, Tatsumi Ishihara, Do Kyung Kim

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

Oxygen permeation fluxes have been investigated as a function of temperature for a mixed ionic-electronic conducting La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and La0.7Sr0.3Ga0.6Fe0.4O3-δ (LSGF) membranes. Ga-doped composition, which is known for its chemical and structural stability, shows limited oxygen permeation flux as compared with a Co-containing system. However, modification of both surfaces with catalytically surface-reactive La0.6Sr0.4CoO3-δ (LSC) makes Ga-doped perovskite an excellent oxygen-permeable membrane. It has been demonstrated that the effective area of reactive free surface is an important factor in determining the effectiveness of surface modification by La0.6Sr0.4CoO3-δ. On the contrary, the oxygen permeation flux of La0.6Sr0.4Co0.2Fe0.8O3-δ is not affected by surface modification. The rate-determining process is discussed in conjunction with the apparent activation energy for oxygen permeation. As cationic substitution occurs in the vicinity of the interface between the coating layer and substrate membrane at elevated temperatures, the intermediate composition, that is, (La1-xSrx)(Coy′Gay″Fe 1-y′-y″)O3-δ, has been formed in La0.7Sr0.3Ga0.6Fe0.4O3-δ membrane surface-modified by La0.6Sr0.4CoO3-δ.

Original languageEnglish
Pages (from-to)287-296
Number of pages10
JournalSolid State Ionics
Volume158
Issue number3-4
DOIs
Publication statusPublished - Mar 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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