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US 6,712,945 B2Granted
Electrochemical sensor
AssigneeRobert Bosch GmbH
InventorLothar Diehl
Life of this patent
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Abstract
An electrochemical sensor for determining gas components and/or gas concentrations in gas mixtures using a sensor element is described; it has at least one electrode arranged on an ion-conducting solid electrolyte body bordering on a gas space in at least some areas. The electrode has at least two layers, the second layer which faces the gas space having a higher electron conductivity in comparison with the first layer which faces the solid electrolyte body.
Claims20
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas,
- the second layer has a higher electron conductivity;
- and wherein the at least one electrode includes a ceramic component and a metallic component, and a first amount of the ceramic component and the metallic component in the first layer is different than a second amount of the ceramic component and the metallic component in the second layer, the metallic component of the at least one of the first layer and the second layer includes platinum, and the ceramic component of at least one of the first layer and the second layer includes ZrO2 stabilized with Y2O3 and
- wherein the electrode is connected via an electrode supply lead to a circuit located outside the sensor, the electrode and the electrode supply lead arranged in a gas space formed by the electrolyte body.
4 more elements
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas, and
- the second layer has a higher electron conductivity than the first layer;
- wherein the first layer includes 20 to 60 vol % ZrO2 stabilized with Y2O3 and 40 to 80 vol % platinum wherein the first layer includes at least one of Yb2O3, In2O3 and TiO2;
- and wherein the first layer includes 4 to 12 mol % Yb2O3.
4 more elements
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas, and
- the second layer has a higher electron conductivity than the first layer;
- wherein the first layer includes 20 to 60 vol % ZrO2 stabilized with Y2O3 and 40 to 80 vol % platinum wherein the first layer includes at least one of Yb2O3, In2O3 and TiO2;
- wherein the first layer includes 8 mol % Yb2O3.
4 more elements
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas, and
- the second layer has a higher electron conductivity;
- and wherein the at least one electrode includes a ceramic component and a metallic component, and a first amount of the ceramic component and the metallic component in the first layer is different than a second amount of the ceramic component and the metallic component in the second layer, the metallic component of the at least one of the first layer and the second layer includes platinum, and the ceramic component of at least one of the first layer and the second layer includes ZrO2 stabilized with Y2O3;
- and
- an electrode lead leading to the at least one electrode;
- wherein:
- the electrode lead includes at least a first layer and a second layer,
- a composition of the first layer of the electrode lead corresponds to that of the first layer of the at least one electrode, and
- a composition of the second layer of the electrode lead corresponds to that of the second layer of the at least one electrode.
9 more elements
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas, and
- the second layer has a higher electron conductivity;
- and wherein the at least one electrode includes a ceramic component and a metallic component, and a first amount of the ceramic component and the metallic component in the first layer is different than a second amount of the ceramic component and the metallic component in the second layer, the metallic component of the at least one of the first layer and the second layer includes platinum, and the ceramic component of at least one of the first layer and the second layer includes ZrO2 stabilized with Y2O3, wherein:
- a gas space is introduced into another solid electrolyte body, and
- the second layer is wider than the gas space at least across a longitudinal extent of the sensor element so that the second layer extends beyond the gas space laterally into an area between the solid electrolyte body and the other solid electrolyte body.
5 more elements
An electrochemical sensor for determining at least one of a gas component and a gas concentration in a gas mixture, comprising:
- an ion-conducting solid electrolyte body;
- and
- a sensor element including at least one electrode arranged on the solid electrolyte body and exposed to a gas in at least some areas, wherein:
- the at least one electrode includes a first layer facing the solid electrolyte body and a second layer facing the gas, and
- the second layer has a higher electron conductivity;
- and wherein the at least one electrode includes a ceramic component and a metallic component, and a first amount of the ceramic component and the metallic component in the first layer is different than a second amount of the ceramic component and the metallic component in the second layer, the metallic component of the at least one of the first layer and the second layer includes platinum, and the ceramic component of at least one of the first layer and the second layer includes ZrO2 stabilized with Y2O3;
- and
- a gas space arranged in another solid electrolyte body;
- wherein the second layer covers only some areas of the first layer with respect to the gas space.
6 more elements
Dependencies are inferred from the claim text.