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 journalArticle

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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 1 2003
Externally publishedYes

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permeating
Permeation
Perovskite
Oxygen
membranes
Membranes
oxygen
Fluxes
Surface treatment
Oxygen permeable membranes
Chemical analysis
Substitution reactions
Activation energy
structural stability
Coatings
Temperature
perovskite
Substrates
substitutes
activation energy

All Science Journal Classification (ASJC) codes

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

Cite this

Oxygen-permeating property of LaSrBFeO3 (B=Co, Ga) perovskite membrane surface-modified by LaSrCoO3. / Lee, Shiwoo; Lee, Kee Sung; Woo, Sang Kook; Kim, Jong Won; Ishihara, Tatsumi; Kim, Do Kyung.

In: Solid State Ionics, Vol. 158, No. 3-4, 01.03.2003, p. 287-296.

Research output: Contribution to journalArticle

Lee, Shiwoo ; Lee, Kee Sung ; Woo, Sang Kook ; Kim, Jong Won ; Ishihara, Tatsumi ; Kim, Do Kyung. / Oxygen-permeating property of LaSrBFeO3 (B=Co, Ga) perovskite membrane surface-modified by LaSrCoO3. In: Solid State Ionics. 2003 ; Vol. 158, No. 3-4. pp. 287-296.
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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.",
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T1 - Oxygen-permeating property of LaSrBFeO3 (B=Co, Ga) perovskite membrane surface-modified by LaSrCoO3

AU - Lee, Shiwoo

AU - Lee, Kee Sung

AU - Woo, Sang Kook

AU - Kim, Jong Won

AU - Ishihara, Tatsumi

AU - Kim, Do Kyung

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N2 - 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.

AB - 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.

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