La(Sr)Ga(Fe)O3 perovskite oxide as a new mixed ionic-electronic conductor for oxygen permeating membrane

Tatsumi Ishihara; Yuko Tsuruta; Yu Chunying; Toshitsune Todaka; Hiroyasu Nishiguchi; Yusaku Takita

doi:10.1149/1.1524174

La(Sr)Ga(Fe)O₃ perovskite oxide as a new mixed ionic-electronic conductor for oxygen permeating membrane

Tatsumi Ishihara, Yuko Tsuruta, Yu Chunying, Toshitsune Todaka, Hiroyasu Nishiguchi, Yusaku Takita

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Fe-doped La_1-xSr_xGaO₃ exhibits a high conductivity (∼1 S/cm) and a high oxygen permeation rate. In particular, the highest conductivity and the oxygen permeating rate were attained at La_0.7Sr_0.3Ga_0.6Fe_0.4O₃ (LSGF). Although a surface catalyst is required, oxygen permeation rate from air to Ar was as high as 2.5 cm³ std/min cm² at 1273 K and 0.3 mm membrane thickness. Oxygen permeation rate from air to Ar increased in the following order, La_0.6Sr_0.4CoO₃ > La_0.9Sr_0.1CoO₃ = Sm_0.5Sr_0.5CoO₃ ≫ Sm_0.6Sr_0.4CoO₃, as the surface catalyst. Since the p₀₂ gradient becomes larger, the oxygen permeation rate drastically increased by changing from air-Ar to CH₄-air condition. The products were only CO and H₂, having a molar ratio (H₂/CO ratio) of almost two. Electronic hole conduction was only observed in LSGF polarization measurement and the oxide ion conductivity estimated is as high as s = 0.6 S cm^-1 at 1073 K. At high p_o2, the main defect in LSGF is O_i″ and Fe_Fe^̇ and at intermediate p_o2, concentration of Fe_Fe^̇ is balanced with that of O_i″. The estimated transport number of oxide ion was ca. 0.6, which is in a good agreement with that estimated by the electromotive force in H₂-O₂ gas concentration cells.

Original language	English
Pages (from-to)	E17-E23
Journal	Journal of the Electrochemical Society
Volume	150
Issue number	1
DOIs	https://doi.org/10.1149/1.1524174
Publication status	Published - Jan 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.1524174

Cite this

@article{817d5593f829420c81becb8a1009c7fa,

title = "La(Sr)Ga(Fe)O3 perovskite oxide as a new mixed ionic-electronic conductor for oxygen permeating membrane",

abstract = "Fe-doped La1-xSrxGaO3 exhibits a high conductivity (∼1 S/cm) and a high oxygen permeation rate. In particular, the highest conductivity and the oxygen permeating rate were attained at La0.7Sr0.3Ga0.6Fe0.4O3 (LSGF). Although a surface catalyst is required, oxygen permeation rate from air to Ar was as high as 2.5 cm3 std/min cm2 at 1273 K and 0.3 mm membrane thickness. Oxygen permeation rate from air to Ar increased in the following order, La0.6Sr0.4CoO3 > La0.9Sr0.1CoO3 = Sm0.5Sr0.5CoO3 ≫ Sm0.6Sr0.4CoO3, as the surface catalyst. Since the p02 gradient becomes larger, the oxygen permeation rate drastically increased by changing from air-Ar to CH4-air condition. The products were only CO and H2, having a molar ratio (H2/CO ratio) of almost two. Electronic hole conduction was only observed in LSGF polarization measurement and the oxide ion conductivity estimated is as high as s = 0.6 S cm-1 at 1073 K. At high po2, the main defect in LSGF is Oi″ and FeF{\.e} and at intermediate po2, concentration of FeF{\.e} is balanced with that of Oi″. The estimated transport number of oxide ion was ca. 0.6, which is in a good agreement with that estimated by the electromotive force in H2-O2 gas concentration cells.",

author = "Tatsumi Ishihara and Yuko Tsuruta and Yu Chunying and Toshitsune Todaka and Hiroyasu Nishiguchi and Yusaku Takita",

year = "2003",

month = jan,

doi = "10.1149/1.1524174",

language = "English",

volume = "150",

pages = "E17--E23",

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T1 - La(Sr)Ga(Fe)O3 perovskite oxide as a new mixed ionic-electronic conductor for oxygen permeating membrane

AU - Ishihara, Tatsumi

AU - Tsuruta, Yuko

AU - Chunying, Yu

AU - Todaka, Toshitsune

AU - Nishiguchi, Hiroyasu

AU - Takita, Yusaku

PY - 2003/1

Y1 - 2003/1

N2 - Fe-doped La1-xSrxGaO3 exhibits a high conductivity (∼1 S/cm) and a high oxygen permeation rate. In particular, the highest conductivity and the oxygen permeating rate were attained at La0.7Sr0.3Ga0.6Fe0.4O3 (LSGF). Although a surface catalyst is required, oxygen permeation rate from air to Ar was as high as 2.5 cm3 std/min cm2 at 1273 K and 0.3 mm membrane thickness. Oxygen permeation rate from air to Ar increased in the following order, La0.6Sr0.4CoO3 > La0.9Sr0.1CoO3 = Sm0.5Sr0.5CoO3 ≫ Sm0.6Sr0.4CoO3, as the surface catalyst. Since the p02 gradient becomes larger, the oxygen permeation rate drastically increased by changing from air-Ar to CH4-air condition. The products were only CO and H2, having a molar ratio (H2/CO ratio) of almost two. Electronic hole conduction was only observed in LSGF polarization measurement and the oxide ion conductivity estimated is as high as s = 0.6 S cm-1 at 1073 K. At high po2, the main defect in LSGF is Oi″ and FeFė and at intermediate po2, concentration of FeFė is balanced with that of Oi″. The estimated transport number of oxide ion was ca. 0.6, which is in a good agreement with that estimated by the electromotive force in H2-O2 gas concentration cells.

AB - Fe-doped La1-xSrxGaO3 exhibits a high conductivity (∼1 S/cm) and a high oxygen permeation rate. In particular, the highest conductivity and the oxygen permeating rate were attained at La0.7Sr0.3Ga0.6Fe0.4O3 (LSGF). Although a surface catalyst is required, oxygen permeation rate from air to Ar was as high as 2.5 cm3 std/min cm2 at 1273 K and 0.3 mm membrane thickness. Oxygen permeation rate from air to Ar increased in the following order, La0.6Sr0.4CoO3 > La0.9Sr0.1CoO3 = Sm0.5Sr0.5CoO3 ≫ Sm0.6Sr0.4CoO3, as the surface catalyst. Since the p02 gradient becomes larger, the oxygen permeation rate drastically increased by changing from air-Ar to CH4-air condition. The products were only CO and H2, having a molar ratio (H2/CO ratio) of almost two. Electronic hole conduction was only observed in LSGF polarization measurement and the oxide ion conductivity estimated is as high as s = 0.6 S cm-1 at 1073 K. At high po2, the main defect in LSGF is Oi″ and FeFė and at intermediate po2, concentration of FeFė is balanced with that of Oi″. The estimated transport number of oxide ion was ca. 0.6, which is in a good agreement with that estimated by the electromotive force in H2-O2 gas concentration cells.

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