Chemical stability of La0.6Sr0.4CoO3−δ in oxygen permeation applications under exposure to N2 and CO2

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Abstract

Phase stability and chemical reactivity of (La0.6Sr0.4)0.99CoO3−δ (LSC64) was tested in oxidative (pO2= 0.21 atm) and slightly reducing conditions (pO2~10−5 atm), as well as in carbon dioxide (pO2~10−4 atm) to evaluate the material performance for oxygen separation technologies. Thin film LSC64 oxygen separation membranes (20–30 μm) were manufactured and electrochemical performance was evaluated at a range of temperatures with either nitrogen or CO2 purged on the permeate side of the membrane. Material stability was also investigated by high temperature X-ray diffraction, TGA and conductivity measurements in air, N2 and CO2. Under mild reduction LSC64 partly decomposes to a K2NiF4-type phase (i.e. (La,Sr)2CoO4), and Co-oxide, and under high pCO2 forms SrCO3. The latter is found to impair membrane performance. Electrical properties and oxygen permeation (jO2) in thin membranes depend on the thermal and chemical history of the samples. A flux of 4–6 Nml min−1 cm−2 in the temperature range of 800–900 °C was demonstrated for optimized membranes and conditions. © 2012 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalSolid State Ionics
Volume227
Pages (from-to)46–56
ISSN0167-2738
DOIs
Publication statusPublished - 2012

Keywords

  • Perovskites
  • La0.6Sr0.4CoO3−δ
  • Oxygen Transport Membranes
  • SrCO3

Cite this

@article{34a06e3e80834846828cb621e070118f,
title = "Chemical stability of La0.6Sr0.4CoO3−δ in oxygen permeation applications under exposure to N2 and CO2",
abstract = "Phase stability and chemical reactivity of (La0.6Sr0.4)0.99CoO3−δ (LSC64) was tested in oxidative (pO2= 0.21 atm) and slightly reducing conditions (pO2~10−5 atm), as well as in carbon dioxide (pO2~10−4 atm) to evaluate the material performance for oxygen separation technologies. Thin film LSC64 oxygen separation membranes (20–30 μm) were manufactured and electrochemical performance was evaluated at a range of temperatures with either nitrogen or CO2 purged on the permeate side of the membrane. Material stability was also investigated by high temperature X-ray diffraction, TGA and conductivity measurements in air, N2 and CO2. Under mild reduction LSC64 partly decomposes to a K2NiF4-type phase (i.e. (La,Sr)2CoO4), and Co-oxide, and under high pCO2 forms SrCO3. The latter is found to impair membrane performance. Electrical properties and oxygen permeation (jO2) in thin membranes depend on the thermal and chemical history of the samples. A flux of 4–6 Nml min−1 cm−2 in the temperature range of 800–900 °C was demonstrated for optimized membranes and conditions. {\circledC} 2012 Elsevier B.V. All rights reserved.",
keywords = "Perovskites, La0.6Sr0.4CoO3−δ, Oxygen Transport Membranes, SrCO3",
author = "Vincenzo Esposito and Martin S{\o}gaard and Hendriksen, {Peter Vang}",
year = "2012",
doi = "10.1016/j.ssi.2012.08.015",
language = "English",
volume = "227",
pages = "46–56",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

Chemical stability of La0.6Sr0.4CoO3−δ in oxygen permeation applications under exposure to N2 and CO2. / Esposito, Vincenzo; Søgaard, Martin; Hendriksen, Peter Vang.

In: Solid State Ionics, Vol. 227, 2012, p. 46–56.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Chemical stability of La0.6Sr0.4CoO3−δ in oxygen permeation applications under exposure to N2 and CO2

AU - Esposito, Vincenzo

AU - Søgaard, Martin

AU - Hendriksen, Peter Vang

PY - 2012

Y1 - 2012

N2 - Phase stability and chemical reactivity of (La0.6Sr0.4)0.99CoO3−δ (LSC64) was tested in oxidative (pO2= 0.21 atm) and slightly reducing conditions (pO2~10−5 atm), as well as in carbon dioxide (pO2~10−4 atm) to evaluate the material performance for oxygen separation technologies. Thin film LSC64 oxygen separation membranes (20–30 μm) were manufactured and electrochemical performance was evaluated at a range of temperatures with either nitrogen or CO2 purged on the permeate side of the membrane. Material stability was also investigated by high temperature X-ray diffraction, TGA and conductivity measurements in air, N2 and CO2. Under mild reduction LSC64 partly decomposes to a K2NiF4-type phase (i.e. (La,Sr)2CoO4), and Co-oxide, and under high pCO2 forms SrCO3. The latter is found to impair membrane performance. Electrical properties and oxygen permeation (jO2) in thin membranes depend on the thermal and chemical history of the samples. A flux of 4–6 Nml min−1 cm−2 in the temperature range of 800–900 °C was demonstrated for optimized membranes and conditions. © 2012 Elsevier B.V. All rights reserved.

AB - Phase stability and chemical reactivity of (La0.6Sr0.4)0.99CoO3−δ (LSC64) was tested in oxidative (pO2= 0.21 atm) and slightly reducing conditions (pO2~10−5 atm), as well as in carbon dioxide (pO2~10−4 atm) to evaluate the material performance for oxygen separation technologies. Thin film LSC64 oxygen separation membranes (20–30 μm) were manufactured and electrochemical performance was evaluated at a range of temperatures with either nitrogen or CO2 purged on the permeate side of the membrane. Material stability was also investigated by high temperature X-ray diffraction, TGA and conductivity measurements in air, N2 and CO2. Under mild reduction LSC64 partly decomposes to a K2NiF4-type phase (i.e. (La,Sr)2CoO4), and Co-oxide, and under high pCO2 forms SrCO3. The latter is found to impair membrane performance. Electrical properties and oxygen permeation (jO2) in thin membranes depend on the thermal and chemical history of the samples. A flux of 4–6 Nml min−1 cm−2 in the temperature range of 800–900 °C was demonstrated for optimized membranes and conditions. © 2012 Elsevier B.V. All rights reserved.

KW - Perovskites

KW - La0.6Sr0.4CoO3−δ

KW - Oxygen Transport Membranes

KW - SrCO3

U2 - 10.1016/j.ssi.2012.08.015

DO - 10.1016/j.ssi.2012.08.015

M3 - Journal article

VL - 227

SP - 46

EP - 56

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -