Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes

T. H. Lee, Y. L. Yang, A. J. Jacobson, B. Abeles, Scott Thomas Milner

Research output: Contribution to journalArticle

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Abstract

Measurements of oxygen flux, in the temperature range, 770-870°C on planar membranes of SrCo0.8Fe0.2O3-δ, consisting of a dense discs ∼0.1 cm thick modified by coating with porous layers on both sides, yielded an enhancement in the oxygen flux, η≈2, compared to the uncoated membrane. When only one side of the disc was coated with the porous layer on the high pressure side of the membrane then η≈1.2, while when the modified side was on the low pressure side then η≈1.4. The observed values of η were explained by a model of diffusion-reaction transport in mixed ionic electronic conductor membranes with porous electrodes, extended to the case of finite thickness of the dense layer. From a fit of the model to the experimental data, values of the surface exchange coefficient, ki0, and ambipolar oxygen ion-electron hole pair diffusion coefficient, Da, were deduced. At 870°C, ki0 = 2.5 × 10-4 cm/s and Da = 5 × 10-6 cm2/s.

Original languageEnglish (US)
Pages (from-to)87-94
Number of pages8
JournalSolid State Ionics
Volume100
Issue number1-2
StatePublished - Sep 1 1997

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Permeation
Oxygen
membranes
Membranes
Electrodes
electrodes
oxygen
Fluxes
Ion exchange
oxygen ions
Ions
Coatings
diffusion coefficient
low pressure
conductors
Electrons
coatings
augmentation
coefficients
electronics

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, T. H., Yang, Y. L., Jacobson, A. J., Abeles, B., & Milner, S. T. (1997). Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes. Solid State Ionics, 100(1-2), 87-94.
Lee, T. H. ; Yang, Y. L. ; Jacobson, A. J. ; Abeles, B. ; Milner, Scott Thomas. / Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes. In: Solid State Ionics. 1997 ; Vol. 100, No. 1-2. pp. 87-94.
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Lee, TH, Yang, YL, Jacobson, AJ, Abeles, B & Milner, ST 1997, 'Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes', Solid State Ionics, vol. 100, no. 1-2, pp. 87-94.

Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes. / Lee, T. H.; Yang, Y. L.; Jacobson, A. J.; Abeles, B.; Milner, Scott Thomas.

In: Solid State Ionics, Vol. 100, No. 1-2, 01.09.1997, p. 87-94.

Research output: Contribution to journalArticle

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AU - Lee, T. H.

AU - Yang, Y. L.

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AU - Milner, Scott Thomas

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N2 - Measurements of oxygen flux, in the temperature range, 770-870°C on planar membranes of SrCo0.8Fe0.2O3-δ, consisting of a dense discs ∼0.1 cm thick modified by coating with porous layers on both sides, yielded an enhancement in the oxygen flux, η≈2, compared to the uncoated membrane. When only one side of the disc was coated with the porous layer on the high pressure side of the membrane then η≈1.2, while when the modified side was on the low pressure side then η≈1.4. The observed values of η were explained by a model of diffusion-reaction transport in mixed ionic electronic conductor membranes with porous electrodes, extended to the case of finite thickness of the dense layer. From a fit of the model to the experimental data, values of the surface exchange coefficient, ki0, and ambipolar oxygen ion-electron hole pair diffusion coefficient, Da, were deduced. At 870°C, ki0 = 2.5 × 10-4 cm/s and Da = 5 × 10-6 cm2/s.

AB - Measurements of oxygen flux, in the temperature range, 770-870°C on planar membranes of SrCo0.8Fe0.2O3-δ, consisting of a dense discs ∼0.1 cm thick modified by coating with porous layers on both sides, yielded an enhancement in the oxygen flux, η≈2, compared to the uncoated membrane. When only one side of the disc was coated with the porous layer on the high pressure side of the membrane then η≈1.2, while when the modified side was on the low pressure side then η≈1.4. The observed values of η were explained by a model of diffusion-reaction transport in mixed ionic electronic conductor membranes with porous electrodes, extended to the case of finite thickness of the dense layer. From a fit of the model to the experimental data, values of the surface exchange coefficient, ki0, and ambipolar oxygen ion-electron hole pair diffusion coefficient, Da, were deduced. At 870°C, ki0 = 2.5 × 10-4 cm/s and Da = 5 × 10-6 cm2/s.

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Lee TH, Yang YL, Jacobson AJ, Abeles B, Milner ST. Oxygen permeation in SrCo0.8Fe0.2O3-δ membranes with porous electrodes. Solid State Ionics. 1997 Sep 1;100(1-2):87-94.