Limiting-current type gas sensor, fabrication method of the limiting-current type gas sensor and sensor network system
US-2015377823-A1 · Dec 31, 2015 · US
Gas Sensor Electrode and Method for Producing Same
US2019094173A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019094173-A1 |
| Application number | US-201716079195-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 22, 2017 |
| Priority date | Feb 24, 2016 |
| Publication date | Mar 28, 2019 |
| Grant date | — |
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Abstract
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The present invention aims at providing an electrode having more sufficient electrode activity and electrical conductivity as a sensor electrode for various gas sensors than conventional sensor electrodes. The present invention relates to a gas sensor electrode including a platinum-containing layer having mixed and dispersed therein a conductive particle phase composed of Pt or a Pt alloy and a ceramic particle phase, and a ceramic layer containing a ceramic material, wherein the platinum-containing layer and the ceramic layer are porous, and the porosity of the ceramic layer as measured by image analysis of a cross-sectional SEM appearance is from 1 to 40% and the average pore size of the ceramic layer is from 0.1 to 5 μm.
First claim
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1 . A gas sensor electrode comprising: a platinum-containing layer having mixed and dispersed therein a conductive particle phase composed of Pt or a Pt alloy and a ceramic particle phase, and a ceramic layer containing a ceramic material, wherein the platinum-containing layer and the ceramic layer are porous, and a porosity of the ceramic layer as measured by image analysis of a cross-sectional SEM appearance is from 1 to 40% and an average pore size of the ceramic layer is from 0.1 to 5 μm. 2 . The gas sensor electrode according to claim 1 , wherein a porosity of the platinum-containing layer as measured by image analysis of a cross-sectional SEM appearance is from 1 to 40% and an average pore size of the platinum-containing layer is from 0.1 to 5 μm. 3 . The gas sensor electrode according to claim 1 , wherein a ratio of a film thickness of the ceramic layer to a film thickness of the platinum-containing layer is from 0.1 to 3. 4 . A method for producing the gas sensor electrode according to claim 1 , the production method of the gas sensor electrode comprising the following steps (1) to (3): (1) a step of coating a green sheet serving as a substrate with a ceramic paste obtained by dispersing a ceramic powder in a solvent, (2) a step of further coating the ceramic paste-coated green sheet surface with a metal paste obtained by dispersing a conductive particle composed of Pt or a Pt alloy and a ceramic powder in a solvent, and (3) a step of firing the green sheet coated with the ceramic paste and the metal paste at 1,300 to 1,600° C.
Assignees
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Classifications
- G01N27/4075Primary
Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts · CPC title
Oxygen pumping cells · CPC title
- G01N27/409Primary
Oxygen concentration cells · CPC title
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- What does patent US2019094173A1 cover?
- The present invention aims at providing an electrode having more sufficient electrode activity and electrical conductivity as a sensor electrode for various gas sensors than conventional sensor electrodes. The present invention relates to a gas sensor electrode including a platinum-containing layer having mixed and dispersed therein a conductive particle phase composed of Pt or a Pt alloy and a…
- Who is the assignee on this patent?
- Tanaka Precious Metal Ind
- What technology area does this patent fall under?
- Primary CPC classification G01N27/4075. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Mar 28 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).