CN111141803A - Nitrogen-oxygen sensor - Google Patents
Nitrogen-oxygen sensor Download PDFInfo
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- CN111141803A CN111141803A CN202010038774.9A CN202010038774A CN111141803A CN 111141803 A CN111141803 A CN 111141803A CN 202010038774 A CN202010038774 A CN 202010038774A CN 111141803 A CN111141803 A CN 111141803A
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- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 66
- 239000001301 oxygen Substances 0.000 claims abstract description 66
- 239000000758 substrate Substances 0.000 claims abstract description 36
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 239000011195 cermet Substances 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 3
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 claims 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 69
- 239000007789 gas Substances 0.000 description 11
- 239000003570 air Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
- G01N27/4076—Reference electrodes or reference mixtures
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a nitrogen-oxygen sensor, comprising: the device comprises a substrate, a first electrode, a second electrode, a third electrode and a fourth electrode, wherein the substrate is provided with an opening, a first cavity, a second cavity and the fourth electrode which are sequentially arranged; the first electrode and the fourth electrode are used for adjusting the oxygen concentration in the first chamber; the second electrode and the fourth electrode are used for adjusting the oxygen concentration in the second cavity; the third electrode and the fourth electrode are used for measuring the oxygen concentration in the second chamber; and a reference electrode, the current output to the reference electrode being a fixed current; the first electrode and the reference electrode are used to measure the oxygen concentration in the first chamber, and the second electrode and the reference electrode are used to measure the oxygen concentration in the second chamber. The reference electrode in the nitrogen-oxygen sensor utilizes fixed current reference to replace air reference in the traditional nitrogen-oxygen sensor, so that the nitrogen-oxygen sensor is also applicable to special environments such as severe plateau areas.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a nitrogen-oxygen sensor.
Background
With the improvement of environmental awareness of people, stricter regulations are provided for the exhaust gas discharged by automobiles, diesel engines and other motor vehicles, especially for the content of nitrogen oxides in the exhaust gas. At present, a nitrogen-oxygen sensor is often adopted to detect the content of nitrogen oxides in automobile exhaust.
As shown in fig. 1, the conventional nox sensor is formed on the basis of a substrate 110 formed by laminating a plurality of zirconia substrates. The substrate 110 defines an opening 112, a first chamber 114, a second chamber 116, and a reference gas channel 118. An outer electrode 122 is disposed outside the substrate 110, a first inner electrode 124 is disposed within the first chamber 114, and a second inner electrode 126 and a third inner electrode 128 are disposed within the second chamber 116. The external electrode 122, the first internal electrode 124 and a part of the substrate form a main oxygen pump, the external electrode 122, the second internal electrode 126 and a part of the substrate form an auxiliary oxygen pump, and the external electrode 122, the third electrode 128 and a part of the substrate form a measurement oxygen pump. After the nitrogen oxide enters the first chamber 114 from the opening 112, the main oxygen pumps away part of the oxygen, so that the nitrogen oxide in the first chamber 114 becomes nitric oxide; after the formed nitric oxide enters the second chamber 116, the auxiliary oxygen pump further pumps oxygen away, so that the nitric oxide is reduced to oxygen and nitrogen on the surface of the third electrode 128, and the concentration of nitrogen oxide in the gas entering from the opening 112 can be obtained by measuring the concentration of oxygen decomposed by the oxygen pump.
One of the substrates is also provided with a reference electrode 128, and the reference electrode 128 is connected with the reference channel 118 through the gap inside the substrate, so as to be connected with the external atmosphere to obtain the oxygen content in the external atmosphere as a reference. The reference electrode 128 is electrically connected to the first internal electrode 124 and the second internal electrode 126, and the partial pressure of oxygen within the first chamber 114 can be measured by measuring the voltage between the reference electrode 128 and the first internal electrode 124, and the partial pressure of oxygen within the second chamber 116 can be measured by measuring the voltage between the reference electrode 128 and the second internal electrode 126, thereby controlling the amount of oxygen pumped away by the main oxygen pump and the auxiliary oxygen pump.
However, the conventional reference electrode 128 needs to rely on the concentration of oxygen in the atmosphere as a reference, and the measurement accuracy of oxygen and nitrogen oxide measurement is directly affected by the quality of reference air, and this design is good in laboratory performance, but is not ideal in the actual diesel vehicle application because the quality of ambient air in which the nitrogen-oxygen sensor works is poor, and once the reference air is polluted, the oxygen content measured by the nitrogen-oxygen sensor and the measurement accuracy of the nitrogen-oxygen sensor are greatly reduced.
Disclosure of Invention
In view of the above, it is necessary to provide a nitrogen oxide sensor in order to solve the above problems.
A nitrogen oxygen sensor comprising:
the device comprises a substrate, wherein an opening, a first cavity and a second cavity are formed in the substrate in sequence, the opening is communicated with the first cavity, and the first cavity is communicated with the second cavity;
a first electrode located within the first chamber;
a second electrode positioned within the second chamber;
a third electrode positioned within the second chamber;
a fourth electrode electrically cooperable with the first electrode, the second electrode, and the third electrode; the first electrode and the fourth electrode are used for adjusting the oxygen concentration in the first chamber; the second electrode and the fourth electrode are used for adjusting the oxygen concentration in the second cavity; the third electrode and the fourth electrode are used for measuring the concentration of nitrogen oxide in the second chamber; and
the reference electrode is arranged in the substrate, and the current output to the reference electrode is a fixed current; the reference electrode is electrically matched with the first electrode and the second electrode, the first electrode and the reference electrode are used for measuring the oxygen partial pressure in the first cavity so as to control the adjustment amount of the first electrode and the fourth electrode on the oxygen in the first cavity, and the second electrode and the reference electrode are used for measuring the oxygen partial pressure in the second cavity so as to control the adjustment amount of the second electrode and the fourth electrode on the oxygen in the second cavity.
The reference electrode in the nitrogen-oxygen sensor utilizes fixed current reference to replace air reference in the traditional nitrogen-oxygen sensor, so that the nitrogen-oxygen sensor is also applicable to severe environments and is not influenced by the surrounding gas environment.
The invention is further configured such that the fixed current is in the range of 18 amps to 22 amps.
The invention is further arranged such that the fixed current is 20 amps.
The invention is further configured such that the fourth electrode is disposed inside the substrate.
The invention is further arranged in that the substrate is further provided with a buffer cavity, the buffer cavity is positioned between the opening and the first cavity and/or between the first cavity and the second cavity, and a buffer barrier is arranged in the buffer cavity.
The invention is further arranged that the second electrode and the third electrode are located on the same horizontal line.
The invention further provides that the material of the substrate comprises zirconium oxide.
The invention further provides that the material of the first and second electrodes comprises a cermet.
The invention is further configured such that the third electrode is an activated electrode.
The invention further provides that the nitrogen-oxygen sensor also comprises a heating electrode.
Drawings
FIG. 1 is a cross-sectional view of a conventional NOx sensor;
FIG. 2 is a cross-sectional view of a nitrogen oxygen sensor in an embodiment of the present invention;
FIG. 3 is a partial cross-sectional view of a reference electrode in an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The application provides a can not rely on the nitrogen oxygen sensor of oxygen concentration in the atmosphere as the reference for this nitrogen oxygen sensor also is applicable in very abominable environment equally, and is higher to nitrogen oxide content measurement's accuracy.
Referring to fig. 2 and 3, as shown in fig. 2, a nox sensor 200 according to the present disclosure includes a substrate 210, a first electrode 221, a second electrode 222, a third electrode 223, a fourth electrode 224, and a reference electrode 225.
The substrate 210 may be formed by laminating a plurality of substrates, and optionally, the material of each substrate includes zirconia. The substrate 210 has an opening 211, a first chamber 213 and a second chamber 214 disposed in sequence. The opening 211 is communicated with the first chamber 213, the first chamber 213 is communicated with the second chamber 214, so that the nitrogen oxide gas enters from the opening 211 and enters the first chamber 213, and the gas obtained by the reaction in the first chamber 213 finally enters the second chamber 214. Optionally, a buffer chamber 212 may be further disposed between the opening 211 and the first chamber 213, and a buffer barrier 215 may be disposed in the buffer chamber 212 to buffer and stabilize the gas passing through the buffer chamber 212.
The first electrode 221 is located within the first chamber 213. A second electrode 222 is positioned within the second chamber 214. Illustratively, the material of the first electrode 221 and the second electrode 222 includes a cermet. The first electrode 221 and the second electrode 222 are inactive electrodes, which do not have the capability of decomposing nitric oxide. For example, noble metals such as platinum, zirconia, and other low catalytic activity cermets may be used.
A third electrode 223 is located within the second chamber 214. In this embodiment, the third electrode 223 is an activated electrode, which can decompose nitric oxide. For example, cermets using noble metals such as platinum, zirconia, and other strongly active materials.
Optionally, the second electrode 222 and the third electrode 223, which are both located in the second chamber 214, are located on the same horizontal line, and compared with the conventional method in which the second electrode 222 is provided with the third electrode 223, impurities reacted by the second electrode 222 can be prevented from falling onto the third electrode 223, so that the performance of the nitrogen-oxygen sensor is affected.
The fourth electrode 224 cooperates with the first electrode 221, the second electrode 222 and the third electrode 223 through circuit control. The first electrode 221 and the fourth electrode 224 and the substrate combination between them form a main oxygen pump for regulating the oxygen concentration in the first chamber 213. Specifically, the main oxygen pump pumps out a portion of the oxygen in the first chamber 213, so that the nitrogen oxide (e.g., nitrogen dioxide) in the first chamber 213 becomes nitric oxide, and the formed nitric oxide enters the second chamber 214.
The second electrode 222 and the fourth electrode 224, and the substrate combination therebetween, form an auxiliary oxygen pump for regulating the oxygen concentration in the second chamber 214. Specifically, the auxiliary oxygen pump pumps out all the oxygen in the second chamber 214, so that the nitric oxide in the second chamber 214 is changed into nitrogen and oxygen under the catalytic action of the electrode 223. The concentration of oxygen measured by the measuring electrode 223 may represent the concentration of nitrogen oxides entering from the opening 211.
The third electrode 223 and the fourth electrode 224 and the substrate combination between them form a measurement pump for measuring the concentration of oxygen decomposed from the oxynitride in the second chamber 214, thereby obtaining the concentration of the oxynitride entering from the opening 211.
In this embodiment, the fourth electrode 224 is disposed inside the substrate 210, and with reference to fig. 2 and 3, the substrate 210 is further provided with an air gap channel 215, and the fourth electrode 224 is disposed inside the air gap channel 215, so that the fourth electrode 224 is disposed inside the substrate 210 and can well protect the fourth electrode 224 while having the function of an external electrode in a conventional nox sensor, thereby preventing oily substances from contaminating the fourth electrode 224 and reducing the lifetime of the nox sensor. In other embodiments, the fourth electrode 224 may be disposed outside the substrate 210 and configured with a corresponding protection device.
The reference electrode 225 cooperates with the first electrode 221 and the second electrode 222 through circuit control. The first electrode 221 and the reference electrode 225 are used to measure the oxygen concentration in the first chamber 213 to control the amount of oxygen regulation in the first chamber 213 by the first electrode 221 and the fourth electrode 224, and the second electrode 222 and the reference electrode 225 are used to measure the oxygen concentration in the second chamber 213 to control the amount of oxygen regulation in the second chamber 214 by the second electrode 222 and the fourth electrode 224. Since the amount of oxygen pumped out of the first chamber 213 by the main oxygen pump needs to ensure that the nitrogen oxide (e.g., nitrogen dioxide) in the first chamber 213 is completely changed into nitric oxide to make the finally measured concentration of nitrogen oxide more accurate, the reference electrode 225 and the first electrode 221 need to be arranged to measure the concentration of oxygen in the first chamber 213, so that the amount of oxygen pumped out by the main oxygen pump meets the requirement. Similarly, since the amount of oxygen pumped out by the auxiliary oxygen pump from the second chamber 214 needs to ensure that the nitrogen dioxide in the second chamber 214 is completely changed into oxygen and nitrogen to make the final measured concentration of nitrogen oxide more accurate, the reference electrode 225 and the second electrode 222 need to be arranged to measure the concentration of oxygen in the second chamber 214, so that the amount of oxygen pumped out by the auxiliary oxygen pump meets the requirement.
In the present embodiment, the reference electrode 225 is disposed inside the substrate 210, and the current output to the reference electrode 225 is a fixed current, so that the fixed current is referred to instead of the atmospheric oxygen concentration in the conventional nox sensor, so that the nox sensor is also suitable for use in a harsh environment and is not affected by the ambient gas environment. The concentration of the nitrogen oxide is measured accurately. Illustratively, the fixed current range is 18 amps to 22 amps, with a preferred fixed current of 20 amps.
Further, the nitrogen oxide sensor 200 may further include a heater electrode 226. The heater electrode 226 causes the temperature of the entire NOx sensor to rise rapidly to reach the optimum operating temperature, so that the time to light off of the NOx sensor is particularly fast.
The reference electrode 225 in the nitrogen oxygen sensor 200 utilizes fixed current reference to replace air reference in the traditional nitrogen oxygen sensor, so that the nitrogen oxygen sensor is also applicable to special environments such as severe plateau areas; because the reference electrode 225 does not depend on the oxygen concentration in the atmosphere as reference, a reference gas channel and an air gap communicated with the reference electrode in the traditional nitrogen-oxygen sensor are not needed to be arranged, the slotting process is reduced, the difficulty in preparing the nitrogen-oxygen sensor is reduced, and the pollution to the reference electrode caused by the intrusion of impurities from the reference gas channel is avoided.
Claims (10)
1. A nitrogen-oxygen sensor, comprising:
the device comprises a substrate, wherein an opening, a first cavity and a second cavity are formed in the substrate in sequence, the opening is communicated with the first cavity, and the first cavity is communicated with the second cavity;
a first electrode located within the first chamber;
a second electrode positioned within the second chamber;
a third electrode positioned within the second chamber;
a fourth electrode electrically connected to the first electrode, the second electrode, and the third electrode; the first electrode and the fourth electrode are used for adjusting the oxygen concentration in the first chamber; the second electrode and the fourth electrode are used for adjusting the oxygen concentration in the second cavity; the third electrode and the fourth electrode are used for measuring the oxygen concentration in the second chamber;
the reference electrode is arranged in the substrate, and the current output to the reference electrode is a fixed current; the reference electrode is electrically connected to the first electrode and the second electrode, the first electrode and the reference electrode are used for measuring the oxygen concentration in the first chamber to control the adjustment amount of the first electrode and the fourth electrode on the oxygen in the first chamber, and the second electrode and the reference electrode are used for measuring the oxygen concentration in the second chamber to control the adjustment amount of the second electrode and the fourth electrode on the oxygen in the second chamber.
2. The nitroxide sensor of claim 1, wherein the fixed current is in a range of 18-22 amps.
3. The nitroxide sensor of claim 2, wherein the fixed current is 20 amps.
4. The nitroxide sensor of claim 1, wherein the fourth electrode is disposed inside the substrate.
5. The nitroxide sensor of claim 1, wherein a buffer cavity is further formed on the substrate, the buffer cavity is located between the opening and the first chamber and/or between the first chamber and the second chamber, and a buffer barrier is disposed in the buffer cavity.
6. The nitroxide sensor of claim 1, wherein the second electrode and the third electrode are located on the same horizontal line.
7. The nitroxide sensor of claim 1, wherein the material of the substrate comprises zirconia.
8. The nitroxide sensor of claim 1, wherein the material of the first electrode and the second electrode comprises a cermet.
9. The nitroxide sensor of claim 1, wherein the material of the first electrode and the second electrode comprises a cermet.
10. The nitroxide sensor of claim 1, further comprising a heated electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038774.9A CN111141803A (en) | 2020-01-14 | 2020-01-14 | Nitrogen-oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038774.9A CN111141803A (en) | 2020-01-14 | 2020-01-14 | Nitrogen-oxygen sensor |
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| CN111141803A true CN111141803A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010038774.9A Pending CN111141803A (en) | 2020-01-14 | 2020-01-14 | Nitrogen-oxygen sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474230A (en) * | 2020-05-21 | 2020-07-31 | 江苏惟哲新材料有限公司 | Nitrogen oxygen sensor ceramic chip |
| CN112798667A (en) * | 2021-03-15 | 2021-05-14 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with shielding layer |
| CN112946043A (en) * | 2021-02-02 | 2021-06-11 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN113552201A (en) * | 2021-09-01 | 2021-10-26 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with protective cap coating |
| CN115598189A (en) * | 2022-10-08 | 2023-01-13 | 浙江百岸科技有限公司（Cn） | Nitrogen-oxygen sensor chip with hidden circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111474230A (en) * | 2020-05-21 | 2020-07-31 | 江苏惟哲新材料有限公司 | Nitrogen oxygen sensor ceramic chip |
| CN112946043A (en) * | 2021-02-02 | 2021-06-11 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN112946043B (en) * | 2021-02-02 | 2023-08-29 | 浙江百岸科技有限公司 | Calibration-free wide-area oxygen sensor and detection method thereof |
| CN112798667A (en) * | 2021-03-15 | 2021-05-14 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with shielding layer |
| CN113552201A (en) * | 2021-09-01 | 2021-10-26 | 浙江百岸科技有限公司 | Nitrogen-oxygen sensor chip with protective cap coating |
| CN115598189A (en) * | 2022-10-08 | 2023-01-13 | 浙江百岸科技有限公司（Cn） | Nitrogen-oxygen sensor chip with hidden circuit |
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