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Detecting electrode and nitrogen oxide sensor using the same achieved

Foreign code F110005711
File No. Y0303WO
Posted date Sep 12, 2011
Country United States of America
Application number 51230703
Gazette No. 20050205423
Gazette No. 7537678
Date of filing Apr 18, 2003
Gazette Date Sep 22, 2005
Gazette Date May 26, 2009
International application number JP2003005021
International publication number WO2003091719
Date of international filing Apr 18, 2003
Date of international publication Nov 6, 2003
Priority data
  • P2002-124946 (Apr 25, 2002) JP
  • 2003WO-JP05021 (Apr 18, 2003) WO
Title Detecting electrode and nitrogen oxide sensor using the same achieved
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • IMANAKA NOBUHITO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • G01N027/407C2
  • G01N033/00D2D4A
  • G01V009/00C
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