KR20160054708A - A nitrogen oxide sensor - Google Patents

A nitrogen oxide sensor Download PDF

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Publication number
KR20160054708A
KR20160054708A KR1020140153806A KR20140153806A KR20160054708A KR 20160054708 A KR20160054708 A KR 20160054708A KR 1020140153806 A KR1020140153806 A KR 1020140153806A KR 20140153806 A KR20140153806 A KR 20140153806A KR 20160054708 A KR20160054708 A KR 20160054708A
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South Korea
Prior art keywords
cavity
electrode
nitrogen oxide
exhaust gas
oxygen
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KR1020140153806A
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Korean (ko)
Inventor
홍성진
정연수
박길진
오수민
김은지
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주식회사 아모텍
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Priority to KR1020140153806A priority Critical patent/KR20160054708A/en
Publication of KR20160054708A publication Critical patent/KR20160054708A/en

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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
    • 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
    • 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
    • G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
    • 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
    • G01N27/4073—Composition or fabrication of the solid electrolyte
    • G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
    • 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
    • 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
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—Specially adapted to detect a particular component
    • G01N33/0037—Specially adapted to detect a particular component for NOx

Abstract

A nitrogen oxide sensor is provided. The nitrogen oxide sensor includes a solid electrolyte layer, a first diffusion path that is located at one end of the solid electrolyte layer and allows an external exhaust gas to flow therein, a second diffusion path that is in communication with the first diffusion path and controls the oxygen partial pressure in the exhaust gas that has passed through the first diffusion path An inner pumping electrode formed in the first cavity and an outer pumping electrode formed in a position different from the first cavity to control the voltage between the inner pumping electrode and the outer pumping electrode to remove oxygen in the exhaust gas, 1 pumping electrode, a second cavity communicating with the first cavity to decompose the nitrogen oxide that has passed through the first cavity into nitrogen and oxygen ions, a detection electrode formed in the second cavity, and a reference electrode formed in a different position from the second cavity The concentration of nitrogen oxide is calculated from the current generated by controlling the voltage between the detection electrode and the reference electrode and moving the oxygen ion to the detection electrode .

Description

[0001] The present invention relates to a nitrogen oxide sensor,

The present invention relates to a nitrogen oxide sensor.

The nitrogen oxide gas includes nitrogen monoxide (NO), nitrogen dioxide (NO2), and nitrous oxide (N2O), and is expressed as NOx. Among them, nitrogen monoxide occupies about 80% of nitrogen oxides, and nitrogen monoxide and nitrogen dioxide occupy the majority of nitrogen oxide gas.

In order to prevent global warming caused by fossil fuels, there is an increasing demand for suppressing the emission of carbon dioxide, and it is necessary to improve fuel efficiency in response to this. With this demand, researches on nitrogen oxide sensors are increasing.

As a method for measuring the concentration of the conventional nitrogen oxide gas, there are a method using equilibrium potential, a method of measuring an oxygen current by decomposition of NOx gas, and a mixed potential method.

In the method using the equilibrium potential, an electrochemical cell is formed by forming a solid state electrolyte nitrate as a sensing electrode in a solid electrolyte and forming a noble metal that makes the ion activity in the solid electrolyte constant as an electrode, Measure the concentration of nitrogen oxides.

The method of measuring the oxygen current by the decomposition of NOx gas is a method of measuring the nitrogen oxide concentration by measuring the current by the oxygen ions obtained by decomposing the NOx gas using the pumping cell.

In the mixed potential method, a sensing electrode is formed of a metal oxide on one surface of a solid electrolyte, and a reference electrode is formed on the other surface of the solid electrolyte to measure a potential difference between the sensing electrode and the reference electrode. At this time, the sensing electrode has reactivity to nitrogen oxide and oxygen, but the reference electrode has reactivity only to oxygen, and a potential difference is generated between the sensing electrode and the reference electrode according to the concentration of nitrogen oxide contained in the gas. By measuring the potential difference, The concentration is measured.

However, the conventional nitrogen oxide sensor has a problem in that its structure and mechanical strength are poor, including an air duct into which air is introduced.

JP 4198855 B1

It is an object of the present invention to provide a nitrogen oxide sensor capable of increasing structural and mechanical strength.

According to an aspect of the present invention, there is provided a solid electrolytic capacitor comprising: a solid electrolyte layer; a first diffusion passage positioned at one end of the solid electrolyte layer to allow an exhaust gas to flow therein; An inner pumping electrode formed in the first cavity and an outer pumping electrode formed in a position different from the first cavity, the first cavity controlling the oxygen partial pressure in the exhaust gas passing through the first cavity, A first pumping electrode for controlling the voltage to remove oxygen in the exhaust gas, a second cavity communicating with the first cavity for decomposing nitrogen oxide, which has passed through the first cavity, into nitrogen and oxygen ions, And a reference electrode formed at a position different from that of the second cavity to control a voltage between the detection electrode and the reference electrode, And from a current generated by the move to the detection electrode of the oxygen ions provide a NOx sensor for measuring the concentration of nitrogen oxides.

In addition, a reducing agent may be contained in the first diffusion passage to reduce nitrogen dioxide to nitrogen monoxide.

In addition, the heater may include a heater portion disposed inside the solid electrolyte layer.

In addition, the first diffusion passage may be made of a porous solid electrolyte.

Also, a second pumping electrode formed in the second cavity may be included to control the voltage between the outer pumping electrode and the second pumping electrode to remove oxygen in the exhaust gas.

The inner pumping electrode may include a first electrode disposed on one side of the first cavity to remove oxygen and a second electrode disposed on the other side of the first cavity and connected to the first electrode, So that the oxygen in the exhaust gas can be removed.

And a second diffusion passage connected to the first cavity at one end and connected to the second cavity to lead the exhaust gas passed through the first cavity to the second cavity under a predetermined diffusion resistance have.

The solid electrolyte layer may be formed of a plurality of substrate layers.

The nitrogen oxide sensor according to an embodiment of the present invention may include a pumped reference (PR) structure to increase the structural and mechanical strength.

In addition, the nitrogen oxide sensor according to an embodiment of the present invention may include a PR structure to prevent cracking in the solid electrolyte layer.

1 is a plan view of a nitrogen oxide sensor according to an embodiment of the present invention.
2 is a cross-sectional view taken along line AA in Fig.
3 is a cross-sectional view showing a modified example of a cross section taken along line AA in Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

1 and 2, a nitrogen oxide sensor 1 according to an embodiment of the present invention includes a first diffusion passage 5, a first cavity 7, a first pumping electrode 13, a second diffusion And may include a passage 9, a second cavity 11, a second pumping electrode 23, a detection electrode 19, a reference electrode 21, a solid electrolyte layer 3 and a heater unit 25.

The nitrogen oxide sensor 1 according to an embodiment of the present invention includes a pumped reference (PR) structure to increase the structural and mechanical strength and to prevent cracking in the solid electrolyte layer.

Referring to FIGS. 1 to 3, the solid electrolyte layer 3 may be formed by stacking one layer or a plurality of substrate layers 3a to 3f in a rectangular shape having a flat plate shape in that order.

The solid electrolyte layer 3 includes a first substrate layer 3a, a second substrate layer 3b, a third substrate layer 3c, a fourth substrate layer 3d, 5 substrate layer 3e, and a sixth substrate layer 3f may be stacked, but the present invention is not limited thereto.

The solid electrolyte layer 3 can be produced by using an oxygen ion conductive solid electrolyte such as zirconium oxide and integrally sintering a stack of solid electrolyte layers.

At this time, oxygen is pumped through the solid electrolyte layer 3 because the electrolyte can be conducted to the oxide ions. Further, the solid electrolyte layer 3 is not shown between the respective layers, but an insulating layer is laminated so that the solid electrolyte layer 3 is not denatured by electricity or heat.

On the other hand, the first diffusion passage 5 is provided at the left end of the solid electrolyte layer where the exhaust gas first passes, for example, as shown in Fig. 3, at the left end of the fifth substrate layer 3e But is not limited thereto.

1 and 2, the first diffusion passage 5 is exposed to the outside where the exhaust gas is introduced at one end and communicated with the first cavity 7 at the other end, and the exhaust gas containing nitrogen oxide The gas can be drawn into the first cavity 7.

At this time, the sensitivity of the nitrogen oxide concentration detection can be adjusted by changing the cross-sectional area, the shape of the cross-section, the length, and the like.

On the other hand, the first diffusion passage 5 is a porous solid electrolyte, which prevents the poisoning substances and the like from flowing into the nitrogen oxide sensor by the diffusion resistance of the porous body, and can reduce the nonuniformity of the signal due to the pulsation of the exhaust gas have.

As shown in FIGS. 1 and 2, the first diffusion passage 5 may have a circular cross section, a rectangular cross section, and a truncated cross section, but the present invention is not limited thereto. The first diffusion passage 5 may be formed by stacking sheets, can do.

Therefore, if the diameter of the pores 5a is large, the diffusion rate of the exhaust gas increases. If the diameter of the pores is small, the first diffusion passage 5 reduces the diffusion rate of the exhaust gas, Can be adjusted.

Meanwhile, the area of the first diffusion passage 5 to which the exhaust gas flows may be different from that of the exhaust gas, but is not limited thereto.

A reducing agent may be contained in the first diffusion passage 5 to improve the accuracy of the nitrogen oxide concentration measurement. At this time, since the nitrogen dioxide has a molecular weight larger than that of the nitrogen monoxide, the diffusion rate is slow and causes the inaccuracy of the measurement of the nitrogen oxide concentration, so that the reducing agent reduces nitrogen dioxide to nitrogen monoxide. Therefore, the reducing agent contained in the first diffusion passage 5 can improve the measurement sensitivity of the nitrogen oxide concentration.

Referring to FIG. 2, the first cavity 7 is formed to extend rightward from one end of the first diffusion passage 5, which is the direction of diffusion of the exhaust gas, .

The oxygen partial pressure of the first cavity 7 is controlled by controlling the voltage between the inner pumping electrode and the outer pumping electrode 17 so that the voltage between the inner pumping electrode 15 and the reference electrode 21 is a constant value The oxygen partial pressure in the exhaust gas flowing into the second cavity 11 is made constant.

Referring to FIG. 2, in the first cavity 7, the concentration of oxygen remaining in the exhaust gas through the first pumping electrode 13 can be reduced to a certain level or less. Wherein the first pumping electrode 13 may include an inner pumping electrode 15 and an outer pumping electrode 17 and controls the voltage for pumping the oxygen component in the exhaust gas.

At this time, the inner pumping electrode 15 and the outer pumping electrode 17 may be connected to each other to form the first pumping electrode 13. The first pumping electrode 13 reduces oxygen partial pressure by removing oxygen from the exhaust gas.

At this time, if the oxygen present in the exhaust gas is not sufficiently removed from the first pumping electrode 13, the oxygen reaches the detection electrode 19 and is ionized to act as noise. Therefore, the concentration of nitrogen oxides can be measured to be larger than actual.

On the other hand, when oxygen existing in the exhaust gas is excessively removed from the first pumping electrode 15, nitrogen oxide is reduced in the inner pumping electrode 17 or the second pumping electrode 23 and decomposed into nitrogen and oxygen to act as noise .

Referring to FIG. 2, in an embodiment of the present invention, the inner pumping electrodes 15 are arranged in pairs on the upper and lower sides of the first cavity 7 through which the exhaust gas flows through the first diffusion passage 5 But not limited thereto, and may be disposed only on one side of the first cavity, for example, on the upper side or the lower side.

2, the inner pumping electrode 15 may include a first electrode 15a provided on the upper side of the first cavity 7 and a second electrode 15b provided on the lower side. Of the porous cermet electrode.

The inner pumping electrode 15 may include a connection electrode 15c connecting the first electrode 15a and the second electrode 15b in an embodiment of the present invention. In this case, oxygen may be pumped by the first electrode 15a and current may flow between the second electrode 15b and the outer pumping electrode 17 as an embodiment.

The outer pumping electrode 17 may correspond to the inner pumping electrode 15, that is, the first electrode 15a or the second electrode 15b, and may be disposed in contact with the upper surface of the solid electrolyte layer 3, Shape. At this time, the inner pumping electrode 15 and the outer pumping electrode 17 can be used as a material having a weak or no reducing ability against nitrogen oxides.

At this time, a predetermined voltage is applied between the inner pumping electrode 15 and the outer pumping electrode 17 to apply a predetermined voltage from the outer variable power supply to flow the current from the outer pumping electrode 17 toward the inner pumping electrode 15, The oxygen in the cavity 7 can be poured into the outer space.

The first pumping electrode 13 also energizes between the inner pumping electrode 15 and the outer pumping electrode 17 to pump the oxygen present in the exhaust gas of the first cavity 7, So as to lower the oxygen partial pressure of the gas inside the first cavity 7.

2, in an embodiment of the present invention, the second diffusion passage 9 is connected to the first cavity at one end to introduce the gas that has passed through the first cavity 7, and the other end is connected to the second cavity 11, And directs the exhaust gas to the second cavity 11 under a predetermined diffusion resistance.

Referring to FIGS. 1 and 2, the second diffusion passage 5 is a porous solid electrolyte, and it is possible to prevent the poisoning substances and the like from flowing into the nitrogen oxide sensor by the diffusion resistance of the porous body.

Meanwhile, the second diffusion passage 9 may have a circular or rectangular cross section, but the present invention is not limited thereto. The second diffusion passage 9 may be formed by stacking sheets and may include pores 9a therein.

Accordingly, if the diameter of the pores 9a is large, the second diffusion passage 9 increases the diffusion speed of the exhaust gas and decreases the diffusion speed of the exhaust gas when the diameter of the pores is small, Can be adjusted.

At this time, the second diffusion passage 9 can control the detection sensitivity of the nitrogen oxide concentration by changing the cross-sectional area, the shape of the cross-section, the length, and the like.

2 and 3, in an embodiment of the present invention, the second cavity 11 may extend in the right direction from the second diffusion passage 9 and may have a rectangular or circular cross section, but not limited thereto Do not. At this time, the second cavity (11) is a space for finely adjusting the oxygen partial pressure with respect to the gas that has passed through the second diffusion passage (9).

The nitrogen oxide sensor 1 according to an exemplary embodiment of the present invention is configured such that the voltage between the second pumping electrode 23 and the reference electrode 21 is a constant value between the outer pumping electrode 17 and the inner pumping electrode 15 So that the oxygen partial pressure in the second cavity 11 is constant.

At this time, the oxygen partial pressure can be kept constant by removing oxygen to the extent that the nitrogen oxide is not reduced.

Meanwhile, in one embodiment of the present invention, the detection electrode 19 includes a nitrogen oxide reduction catalyst so that the nitrogen oxide is decomposed into nitrogen and oxygen. At this time, oxygen is ionized and reaches the reference electrode by the voltage caught between the detection electrode 19 and the reference electrode 21. [

The concentration of nitrogen oxide can be measured from the current (Ip) generated by the movement of such oxygen ions. At this time, the value of the current Ip changes depending on the concentration of nitrogen oxide.

1 to 3, in one embodiment of the present invention, the detection electrode 19 is formed on the lower surface of the second cavity 11, for example, on the fourth substrate layer 3d, But it is not limited thereto.

The detection electrode 19 may contain a catalyst capable of reducing nitrogen oxides and may be formed of a porous cermet electrode. At this time, cermet is a sintered material composed of a combination of ceramics and metal.

On the other hand, the detection electrode 19 can also function as a reduction catalyst capable of reducing the nitrogen oxide present in the gas of the second cavity 11. [ Through this, nitrogen oxides are decomposed into nitrogen and oxygen, and then oxygen is generated.

Referring to FIG. 2, in one embodiment of the present invention, the reference electrode 21 is a reference for measuring the oxygen concentration partial pressure. For example, as shown in FIG. 3, the reference electrode 21 is formed on the lower surface of the fourth substrate layer 3d But may be surrounded by the third substrate layer 3c. However, the present invention is not limited thereto.

Accordingly, the nitrogen oxide sensor 1 according to an embodiment of the present invention can increase the structural and mechanical strength and can prevent cracking of the solid electrolyte layer 3.

Referring to FIG. 2, in an embodiment of the present invention, the second pumping electrode 23 can remove oxygen that has not been removed from the first pumping electrode 13, secondarily. The second pumping electrode 23 is arranged on the upper side of the second cavity 11 so as to be spaced a predetermined distance to the right from the inner pumping electrode 15 as shown in Fig. But it is not limited thereto.

At this time, the second pumping electrode 23 may be used as a material having weak or no reducing ability to nitrogen oxides like the inner pumping electrode 15.

The voltage between the second pumping electrode 23 and the outer pumping electrode 17 is controlled so that the voltage between the second pumping electrode 23 and the reference electrode 21 is a constant value, The oxygen concentration can be appropriately maintained.

Further, the second pumping electrode 23 removes oxygen in the exhaust gas constantly so that the nitrogen oxide of the second cavity 11 is not decomposed, that is, a low oxygen concentration that does not substantially affect the nitrogen oxide measurement.

The heater section 25 of the nitrogen oxide sensor 1 according to the embodiment of the present invention may be formed by forming the first substrate layer 3a and the second substrate layer 3b on the lower side of the solid electrolyte layer 3, 2 substrate layer 3b and the upper and lower surfaces of the heater portion may be located between the insulating layers 25a in order to obtain electrical insulation with the solid electrolyte layer.

At this time, the heater unit 25 can raise the temperature for the nitrogen oxide sensor 1 according to the embodiment of the present invention to a smooth operation. This is because when the solid electrolyte layer 3 is stabilized zirconia, the ion conductivity of oxygen is expressed at a temperature of 350 ° C or more. At this time, the heater unit 25 can transmit heat such that the nitrogen oxide sensor is above 350 ° C.

The nitrogen oxide sensor 1 according to an embodiment of the present invention includes the PR (pumped reference) structure of the present invention to increase the structural and mechanical strength and to prevent cracking of the solid electrolyte layer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: nitrogen oxide sensor 3: solid electrolyte layer
5: first diffusion passage 5a: pore of the first diffusion passage
7: first cavity 9: second diffusion passage
9a: pores of the second diffusion passage 11: second cavity
13: first pumping electrode 15: inner pumping electrode
15a: first electrode 15b: second electrode
15c: connecting electrode 17: outer pumping electrode
19: detecting electrode 21: reference electrode
23: second pumping electrode 25: heater part
25a: insulating layer

Claims (8)

A solid electrolyte layer;
A first diffusion passage positioned at one end of the solid electrolyte layer and allowing an external exhaust gas to flow therein;
A first cavity communicating with the first diffusion passage and controlling an oxygen partial pressure in exhaust gas passing through the first diffusion passage;
An inner pumping electrode formed in the first cavity and an outer pumping electrode formed in a different position from the first cavity to control a voltage between the inner pumping electrode and the outer pumping electrode to remove oxygen in the exhaust gas, electrode;
A second cavity communicating with the first cavity to decompose the nitrogen oxide that has passed through the first cavity into nitrogen and oxygen ions;
A sensing electrode formed in the second cavity; And
And a reference electrode formed at a position different from the second cavity,
Wherein the concentration of nitrogen oxide is measured from a current generated by controlling a voltage between the detection electrode and the reference electrode and moving the oxygen ion to the detection electrode. The method according to claim 1,
A nitrogen oxide sensor for reducing nitrogen dioxide to nitrogen monoxide is included in the first diffusion passage, The method according to claim 1,
And a heater portion positioned inside the solid electrolyte layer. The method according to claim 1,
Wherein the first diffusion passage is made of a porous solid electrolyte. 5. The method according to any one of claims 1 to 4,
And a second pumping electrode formed in the second cavity to control the voltage between the outer pumping electrode and the second pumping electrode to remove oxygen in the exhaust gas. 6. The method of claim 5,
Wherein the inner pumping electrode includes a first electrode provided on one side of the first cavity to remove oxygen and a second electrode provided on the other side of the first cavity and connected to the first electrode, A nitrogen oxide sensor that controls the voltage between the pumping electrodes to remove oxygen in the exhaust gas. The method according to claim 6,
And a second diffusion passage connected to the first cavity at one end and connected to the second cavity for leading the exhaust gas passed through the first cavity to the second cavity under a predetermined diffusion resistance. . The method according to claim 6,
Wherein the solid electrolyte layer comprises a plurality of substrate layers.
KR1020140153806A 2014-11-06 2014-11-06 A nitrogen oxide sensor KR20160054708A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108490058A (en) * 2018-04-09 2018-09-04 江苏奥力威传感高科股份有限公司 A kind of NOx sensor towards vehicle energy saving environmental protection
KR20180119304A (en) * 2017-04-25 2018-11-02 (주)나노아이오닉스코리아 NOx sensor without reference electrode exposed to air
CN113267552A (en) * 2021-05-14 2021-08-17 高鑫环保科技(苏州)有限公司 Novel nitrogen oxygen sensor ceramic chip
CN113340963A (en) * 2021-06-17 2021-09-03 浙江新瓷智能科技有限公司 Nitrogen-oxygen electrochemical gas sensor chip

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180119304A (en) * 2017-04-25 2018-11-02 (주)나노아이오닉스코리아 NOx sensor without reference electrode exposed to air
CN108490058A (en) * 2018-04-09 2018-09-04 江苏奥力威传感高科股份有限公司 A kind of NOx sensor towards vehicle energy saving environmental protection
CN113267552A (en) * 2021-05-14 2021-08-17 高鑫环保科技(苏州)有限公司 Novel nitrogen oxygen sensor ceramic chip
CN113267552B (en) * 2021-05-14 2023-12-22 高鑫环保科技(苏州)有限公司 Nitrogen oxygen sensor ceramic chip
CN113340963A (en) * 2021-06-17 2021-09-03 浙江新瓷智能科技有限公司 Nitrogen-oxygen electrochemical gas sensor chip

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