Title:
GAS SENSOR ELEMENT AND GAS SENSOR
Document Type and Number:
WIPO Patent Application WO/2020/136962
Kind Code:
A1
Abstract:
The present invention achieves desired sensor characteristics by combining a plurality of types of precious metals, and stabilizes and maintains sensor characteristics by suppressing changes in catalyst characteristics which are due to alloying. A gas sensor element comprises a solid electrolyte body, a first electrode, a second electrode, and a protective layer. The protective layer at least comprises: a first catalyst layer carrying a first catalyst metal other than a metal that promotes a reduction reaction of nitrogen oxides; and a second catalyst layer carrying only a second catalyst metal that promotes a reduction reaction of nitrogen oxides. The first catalyst layer and the second catalyst layer do not come into direct contact with each other and are arranged side by side on a path through which a gas to be measured is supplied from the outside toward the first electrode.
Inventors:
ITO KAZUMA (JP)
ISHIKAWA TAKANORI (JP)
ISOMURA HIROSHI (JP)
ISHIKAWA TAKANORI (JP)
ISOMURA HIROSHI (JP)
Application Number:
PCT/JP2019/027679
Publication Date:
July 02, 2020
Filing Date:
July 12, 2019
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
G01N27/409
Foreign References:
| JPH01119755A | 1989-05-11 | |||
| JPS621163U | 1987-01-07 | |||
| JPH01232253A | 1989-09-18 | |||
| JP2017187482A | 2017-10-12 | |||
| JP2015072259A | 2015-04-16 | |||
| JP2016188855A | 2016-11-04 | |||
| JP2017223495A | 2017-12-21 | |||
| JPH0425755A | 1992-01-29 |
Attorney, Agent or Firm:
AKAO Kenichiro et al. (JP)
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