Gas sensor for determining the concentration of gas components in gas mixtures and use thereof
First Claim
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1. A gas sensor system for determining a concentration of nitrogen oxide in a gas mixture, comprising:
- a gas sensor; and
a device configured to detect nitrogen oxide in conjunction with the gas sensor amperometrically;
said gas sensor comprising at least one electrochemical measuring cell, a measurement signal of the at least one electrochemical measuring cell determining the concentration of the gas component, the at least one electrochemical measuring cell including a first electrode and at least one additional electrode, wherein at least one of the first electrode and the at least one additional electrode is applied to a solid electrolyte made of ZrO2, which is partially or fully stabilized by Y2O3, at least one of the first electrode and the at least one additional electrode including a material that at least catalytically decomposes a nitrogen oxide;
wherein the material includes a lanthanum-containing perovskite having the composition La1−
x Srx Co1−
y Cuy O3−
δ
; and
wherein the first electrode and the at least one additional electrode are interconnected as a pump cell; and
a measured pump current measured by the device connected to the pump cell includes a measure of a concentration of the nitrogen oxide present in the gas mixture.
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Abstract
A gas sensor for determining the concentration of gas components in gas mixtures is used in particular to measure the concentration of nitrogen oxides in exhaust gases of internal combustion engines or in the interiors of motor vehicles. It contains an electrochemical measuring cell which includes a first electrode situated on a solid electrolyte and an additional electrode. The electrode is made of an oxide material containing lanthanum which at least catalytically decomposes nitrogen oxides. The pump current flowing between the electrodes is used as a measure of the nitrogen oxide concentration in the gas mixture.
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Citations
8 Claims
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1. A gas sensor system for determining a concentration of nitrogen oxide in a gas mixture, comprising:
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a gas sensor; and a device configured to detect nitrogen oxide in conjunction with the gas sensor amperometrically; said gas sensor comprising at least one electrochemical measuring cell, a measurement signal of the at least one electrochemical measuring cell determining the concentration of the gas component, the at least one electrochemical measuring cell including a first electrode and at least one additional electrode, wherein at least one of the first electrode and the at least one additional electrode is applied to a solid electrolyte made of ZrO2, which is partially or fully stabilized by Y2O3, at least one of the first electrode and the at least one additional electrode including a material that at least catalytically decomposes a nitrogen oxide; wherein the material includes a lanthanum-containing perovskite having the composition La1−
x Srx Co1−
y Cuy O3−
δ
; and
wherein the first electrode and the at least one additional electrode are interconnected as a pump cell; and a measured pump current measured by the device connected to the pump cell includes a measure of a concentration of the nitrogen oxide present in the gas mixture. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of using a gas sensor including at least one electrochemical measuring cell to determine the concentration of NOx in a gas mixture, a measurement signal of the at least one electrochemical measuring cell determining a concentration, the at least one electrochemical measuring cell including a first electrode and at least one additional electrode applied to a solid electrolyte made of ZrO2, which is partially or fully stabilized by Y2O3, at least one of the first electrode and the at least one additional electrode including a material that at least catalytically decomposes a nitrogen oxide, the material including a lanthanum-containing perovskite
having the composition La1− - x Srx Co1−
y Cuy O3−
δ
,wherein the first electrode and the at least one additional electrode are interconnected as a pump cell, and a measured pump current includes a measure of a concentration of the nitrogen oxide present in the gas mixture, the method comprising; operating the gas sensor as an air quality sensor for determining the concentration of the nitrogen oxide by measuring the pump current.
- x Srx Co1−
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8. A method of using a gas sensor including at least one electrochemical measuring cell to determine the concentration of NOx, in a gas mixture, a measurement signal of the at least one electrochemical measuring cell determining a concentration, the at least one electrochemical measuring cell including a first electrode and at least one additional electrode applied to a solid electrolyte made of ZrO2, which is partially or fully stabilized by Y2O3, at least one of the first electrode and the at least one additional electrode including a material that at least catalytically decomposes a nitrogen oxide, the material including a lanthanum-containing perovskite
having the composition La1− - x Srx Co1−
y Cuy O3−
δ
,wherein the first electrode and the at least one additional electrode are interconnected as a pump cell, and a measured pump current includes a measure of a concentration of the nitrogen oxide present in the gas mixture, the method comprising; operating the gas sensor to determine a gas component in an exhaust gas of an internal combustion engine by measuring the pump current.
- x Srx Co1−
Specification
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Current AssigneeRobert Bosch GmbH
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Original AssigneeRobert Bosch GmbH
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InventorsMueller, Bernd, Wahl, Thomas, Schulte, Thomas
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Primary Examiner(s)Olsen, Kaj K.
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Application NumberUS10/149,940Publication NumberTime in Patent Office1,998 DaysField of Search204/424, 204/425, 204/427, 205/781, 205/784.5, 73/233.1US Class Current205/781CPC Class CodesG01N 27/4074 for detection of gases othe...
