SENSOR ELEMENT AND GAS SENSOR
First Claim
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1. A sensor element used in a gas sensor configured to detect an NH3 (ammonia) concentration of a gas to be measured, the sensor element comprising:
- a structural body comprising a solid electrolyte having oxygen ion conductivity;
an outer side electrode disposed on an outer surface of the structural body;
a porous protective layer covering the outer side electrode;
an internal chamber provided inside the structural body; and
an inner side electrode disposed in the internal chamber,wherein the outer side electrode includes a substance having an ability to decompose NH3, andthe porous protective layer prevents release of the substance having the ability to decompose NH3 from the outer side electrode, while allowing oxygen to pass from the gas to be measured to the outer side electrode.
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Abstract
In a sensor element that is used in a gas sensor capable of detecting an NH3 concentration of a gas to be measured, an outer side electrode formed on a surface of the sensor element is covered with a porous protective layer having a density and thickness that prevent Pt from being released from the outer side electrode while allowing oxygen to pass from the gas to be measured to the outer side electrode, whereby adhesion of a substance having the ability to decompose NH3 onto a protective cover is prevented.
4 Citations
22 Claims
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1. A sensor element used in a gas sensor configured to detect an NH3 (ammonia) concentration of a gas to be measured, the sensor element comprising:
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a structural body comprising a solid electrolyte having oxygen ion conductivity; an outer side electrode disposed on an outer surface of the structural body; a porous protective layer covering the outer side electrode; an internal chamber provided inside the structural body; and an inner side electrode disposed in the internal chamber, wherein the outer side electrode includes a substance having an ability to decompose NH3, and the porous protective layer prevents release of the substance having the ability to decompose NH3 from the outer side electrode, while allowing oxygen to pass from the gas to be measured to the outer side electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A gas sensor comprising:
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a sensor element configured to detect an NH3 (ammonia) concentration of a gas to be measured; and a protective cover configured to regulate inflow of the gas to be measured into the sensor element together with protecting the sensor element, wherein the sensor element comprises; a structural body comprising a solid electrolyte having oxygen ion conductivity; an outer side electrode disposed on an outer surface of the structural body; a porous protective layer covering the outer side electrode; an internal chamber provided inside the structural body; and an inner side electrode disposed in the internal chamber, and wherein the outer side electrode includes a substance having an ability to decompose NH3, and the porous protective layer prevents release of the substance having the ability to decompose NH3 from the outer side electrode, while allowing oxygen to pass from the gas to be measured to the outer side electrode. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification