Catalytic chemical potential shift on the surface of nonstoichiometric oxides under non-equilibrium gas atmosphere

Keiji Yashiro; Shigenori Onuma; Maya Sase; Atsushi Kaimai; Takanori Otake; Hiroshige Matsumoto; Tatsuya Kawada; Junichiro Mizusaki

doi:10.1016/j.ssi.2005.06.027

Catalytic chemical potential shift on the surface of nonstoichiometric oxides under non-equilibrium gas atmosphere

Keiji Yashiro, Shigenori Onuma, Maya Sase, Atsushi Kaimai, Takanori Otake, Hiroshige Matsumoto, Tatsuya Kawada, Junichiro Mizusaki

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

Perovskite-type oxide, La_0.5Sr_0.5CoO _3-δ, has large oxygen nonstoichiometry and high electrical conductivity with a large carrier concentration. The oxygen nonstoichiometry, δ, of dense La_0.5Sr_0.5CoO_3-δ was measured in the stream of NO_x-O₂-N₂ system at 873 to 1073 K by means of a thermogravimetric method. Small amounts of NO ₂ caused large changes in oxygen nonstoichiometry. It seems probable that excessive amounts of oxygen can be incorporated into the bulk due to catalytic decomposition of NO₂, and as a result, oxygen potential on the surface of the sample seems to be much higher than that of gaseous phase. EMF measurements for dense La_0.6Sr_0.4CoO _3-δ electrode also revealed that the oxygen potential is affected by NO₂. Thus, the gas sensing mechanism of this oxide was found to relate to the change of the bulk property, especially oxygen nonstoichiometry.

Original language	English
Pages (from-to)	2411-2416
Number of pages	6
Journal	Solid State Ionics
Volume	176
Issue number	31-34
DOIs	https://doi.org/10.1016/j.ssi.2005.06.027
Publication status	Published - Oct 1 2005
Externally published	Yes
Event	30th Symposium on Solid State Ionics in Japan - Duration: Dec 1 2004 → Dec 3 2004

All Science Journal Classification (ASJC) codes

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

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Catalytic chemical potential shift on the surface of nonstoichiometric oxides under non-equilibrium gas atmosphere. / Yashiro, Keiji; Onuma, Shigenori; Sase, Maya; Kaimai, Atsushi; Otake, Takanori; Matsumoto, Hiroshige; Kawada, Tatsuya; Mizusaki, Junichiro.

In: Solid State Ionics, Vol. 176, No. 31-34, 01.10.2005, p. 2411-2416.

Research output: Contribution to journal › Conference article › peer-review

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title = "Catalytic chemical potential shift on the surface of nonstoichiometric oxides under non-equilibrium gas atmosphere",

abstract = "Perovskite-type oxide, La0.5Sr0.5CoO 3-δ, has large oxygen nonstoichiometry and high electrical conductivity with a large carrier concentration. The oxygen nonstoichiometry, δ, of dense La0.5Sr0.5CoO3-δ was measured in the stream of NOx-O2-N2 system at 873 to 1073 K by means of a thermogravimetric method. Small amounts of NO 2 caused large changes in oxygen nonstoichiometry. It seems probable that excessive amounts of oxygen can be incorporated into the bulk due to catalytic decomposition of NO2, and as a result, oxygen potential on the surface of the sample seems to be much higher than that of gaseous phase. EMF measurements for dense La0.6Sr0.4CoO 3-δ electrode also revealed that the oxygen potential is affected by NO2. Thus, the gas sensing mechanism of this oxide was found to relate to the change of the bulk property, especially oxygen nonstoichiometry.",

author = "Keiji Yashiro and Shigenori Onuma and Maya Sase and Atsushi Kaimai and Takanori Otake and Hiroshige Matsumoto and Tatsuya Kawada and Junichiro Mizusaki",

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AU - Yashiro, Keiji

AU - Onuma, Shigenori

AU - Sase, Maya

AU - Kaimai, Atsushi

AU - Otake, Takanori

AU - Matsumoto, Hiroshige

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

PY - 2005/10/1

Y1 - 2005/10/1

N2 - Perovskite-type oxide, La0.5Sr0.5CoO 3-δ, has large oxygen nonstoichiometry and high electrical conductivity with a large carrier concentration. The oxygen nonstoichiometry, δ, of dense La0.5Sr0.5CoO3-δ was measured in the stream of NOx-O2-N2 system at 873 to 1073 K by means of a thermogravimetric method. Small amounts of NO 2 caused large changes in oxygen nonstoichiometry. It seems probable that excessive amounts of oxygen can be incorporated into the bulk due to catalytic decomposition of NO2, and as a result, oxygen potential on the surface of the sample seems to be much higher than that of gaseous phase. EMF measurements for dense La0.6Sr0.4CoO 3-δ electrode also revealed that the oxygen potential is affected by NO2. Thus, the gas sensing mechanism of this oxide was found to relate to the change of the bulk property, especially oxygen nonstoichiometry.

AB - Perovskite-type oxide, La0.5Sr0.5CoO 3-δ, has large oxygen nonstoichiometry and high electrical conductivity with a large carrier concentration. The oxygen nonstoichiometry, δ, of dense La0.5Sr0.5CoO3-δ was measured in the stream of NOx-O2-N2 system at 873 to 1073 K by means of a thermogravimetric method. Small amounts of NO 2 caused large changes in oxygen nonstoichiometry. It seems probable that excessive amounts of oxygen can be incorporated into the bulk due to catalytic decomposition of NO2, and as a result, oxygen potential on the surface of the sample seems to be much higher than that of gaseous phase. EMF measurements for dense La0.6Sr0.4CoO 3-δ electrode also revealed that the oxygen potential is affected by NO2. Thus, the gas sensing mechanism of this oxide was found to relate to the change of the bulk property, especially oxygen nonstoichiometry.

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JO - Solid State Ionics

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