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Detecting electrode and nitrogen oxide sensor using the same 実績あり

外国特許コード F110005711
整理番号 Y0303WO
掲載日 2011年9月12日
出願国 アメリカ合衆国
出願番号 51230703
公報番号 20050205423
公報番号 7537678
出願日 平成15年4月18日(2003.4.18)
公報発行日 平成17年9月22日(2005.9.22)
公報発行日 平成21年5月26日(2009.5.26)
国際出願番号 JP2003005021
国際公開番号 WO2003091719
国際出願日 平成15年4月18日(2003.4.18)
国際公開日 平成15年11月6日(2003.11.6)
優先権データ
  • 特願2002-124946 (2002.4.25) JP
  • 2003WO-JP05021 (2003.4.18) WO
発明の名称 (英語) Detecting electrode and nitrogen oxide sensor using the same 実績あり
発明の概要(英語) (US7537678)
The present invention uses a sensor electrode (3) in a nitrogen oxide sensor (10) which includes a nitrate or nitrite of an alkali metal and an oxide of a rare-earth element.
The nitrate/nitrite of the alkali metal replaces part of the lattice of the oxide of the rare-earth element, forming a solid solution.
The sensor electrode (3) therefore exhibits highly practical features, especially high water-insolubility and capability of nitrogen oxide measurement in a hot and humid atmosphere containing water vapor.
Thus, a highly practical nitrogen oxide sensor electrode and nitrogen oxide sensor are provided which are usable in measurement in a hot and humid atmosphere containing water vapor.
特許請求の範囲(英語) [claim1]
1. A nitrogen oxide sensor electrode, comprising: a solid solution of a nitrate or nitrite of an alkali metal;
and an oxide of a rare-earth element.
[claim2]
2. The nitrogen oxide sensor electrode as set forth in claim 1, wherein said oxide is Eu2O3, Y2O3, or Gd2O3.
[claim3]
3. The nitrogen oxide sensor electrode as set forth in claim 1, wherein said nitrate or nitrite is a nitrite of an alkali metal.
[claim4]
4. The nitrogen oxide sensor electrode as set forth in claim 3, wherein said nitrite is KNO2.
[claim5]
5. A nitrogen oxide sensor, comprising: the nitrogen oxide sensor electrode as set forth in claim 1;
a solid electrolyte;
and an oxide ion conductor, wherein: the nitrogen oxide sensor electrode and the oxide ion conductor are provided in contact with a surface of the solid electrolyte;
and
the solid electrolyte conducts magnesium ions, aluminum ions, rare earth ions, zirconium ions, or hafnium ions.
[claim6]
6. The nitrogen oxide sensor as set forth in claim 5, wherein the solid electrolyte is sandwiched between the nitrogen oxide sensor electrode and the oxide ion conductor.
[claim7]
7. The nitrogen oxide sensor as set forth in claim 5, wherein the solid electrolyte has a Nasicon or beta -iron sulfate crystal structure.
[claim8]
8. The nitrogen oxide sensor as set forth in claim 7, wherein the solid electrolyte is a complex of Mg1+XZr4P6O24+X (0<X <= 0.4) and Zr2O(PO4)2 or a solid solution, Mgl-2Y(Zr1-YNbY)4P6O24 (0 <= Y<1/2), conducting magnesium ions.
[claim9]
9. The nitrogen oxide sensor as set forth in claim 7, wherein the solid electrolyte has a composition, (Al0.2Zr0.8)20/19Nb(PO4)3, conducting aluminum ions.
[claim10]
10. The nitrogen oxide sensor as set forth in claim 7, wherein the solid electrolyte has a composition, R1/3Zr2(PO4)3, conducting rare earth ions, where R is a rare earth atom.
[claim11]
11. The nitrogen oxide sensor as set forth in claim 7, wherein the solid electrolyte has a composition, ZrNb(PO4)3, conducting zirconium ions.
[claim12]
12. The nitrogen oxide sensor as set forth in claim 7, wherein the solid electrolyte has a composition, HfNb(PO4)3, conducting hafnium ions.
[claim13]
13. The nitrogen oxide sensor as set forth in claim 5, wherein the oxide ion conductor is made of at least one of the group consisting of fully stabilized zirconia, cerium oxide, bismuth oxide, hafnium oxide, thorium oxide, and lanthanum gallate.
[claim14]
14. The nitrogen oxide sensor as set forth in claim 5, wherein the solid electrolyte is 0.1 mm to 1.5 mm thick.
[claim15]
15. The nitrogen oxide sensor as set forth in claim 5, wherein the oxide ion conductor is 0.1 mm to 1.5 mm thick.
[claim16]
16. The nitrogen oxide sensor electrode as set forth in claim 2, wherein said nitrate or nitrite is a nitrite of an alkali metal.
[claim17]
17. A nitrogen oxide sensor, comprising: the nitrogen oxide sensor electrode as set forth in claim 2;
a solid electrolyte;
and an oxide ion conductor, wherein: the nitrogen oxide sensor electrode and the oxide ion conductor are provided in contact with a surface of the solid electrolyte;
and
the solid electrolyte conducts magnesium ions, aluminum ions, rare earth ions, zirconium ions, or hafnium ions.
[claim18]
18. A nitrogen oxide sensor, comprising: the nitrogen oxide sensor electrode as set forth in claim 3;
a solid electrolyte;
and an oxide ion conductor, wherein: the nitrogen oxide sensor electrode and the oxide ion conductor are provided in contact with a surface of the solid electrolyte;
and
the solid electrolyte conducts magnesium ions, aluminum ions, rare earth ions, zirconium ions, or hafnium ions.
[claim19]
19. A nitrogen oxide sensor, comprising: the nitrogen oxide sensor electrode as set forth in claim 4;
a solid electrolyte;
and an oxide ion conductor, wherein: the nitrogen oxide sensor electrode and the oxide ion conductor are provided in contact with a surface of the solid electrolyte;
and
the solid electrolyte conducts magnesium ions, aluminum ions, rare earth ions, zirconium ions, or hafnium ions.
[claim20]
20. The nitrogen oxide sensor as set forth in claim 6, wherein the solid electrolyte has a Nasicon or beta -iron sulfate crystal structure.
[claim21]
21. The nitrogen oxide sensor as set forth in claim 5, wherein the nitrogen oxide sensor electrode is of a board shape and 0.1 mm to 1.5 mm thick.
  • 発明者/出願人(英語)
  • IMANAKA NOBUHITO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 204/431
  • 204/280
  • 204/290.01
  • 204/290.1
  • 204/421
  • 204/424
  • 204/426
  • 205/775
  • 205/780.5
  • 205/781
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