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

研究成果: ジャーナルへの寄稿会議記事査読

5 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2411-2416
ページ数6
ジャーナルSolid State Ionics
176
31-34
DOI
出版ステータス出版済み - 2005 10月
イベント30th Symposium on Solid State Ionics in Japan -
継続期間: 2004 12月 12004 12月 3

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