CN207163964U - The hydrogen gas sensor of high selectivity - Google Patents
The hydrogen gas sensor of high selectivity Download PDFInfo
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- CN207163964U CN207163964U CN201621310402.2U CN201621310402U CN207163964U CN 207163964 U CN207163964 U CN 207163964U CN 201621310402 U CN201621310402 U CN 201621310402U CN 207163964 U CN207163964 U CN 207163964U
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- selective
- hydrogen
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- gas sensor
- hydrogen gas
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Abstract
The utility model discloses a kind of hydrogen gas sensor of high selectivity, there is the selective filter layer for the catalyst for targetting catalytic action and selective ventilated membrane including housing, gas detection cell, using the interference gas outside to hydrogen, the gas detection cell, selective filter layer and selective ventilated membrane are arranged in the housing, and the selective filter layer is between the gas detection cell and selective ventilated membrane.The hydrogen gas sensor of high selectivity of the present utility model, monitored suitable for the hydrogen content of the environment such as new-energy automobile in-car, selective ventilated membrane is coordinated by selective filter layer, is available for hydrogen to improve the selective enumeration method to hydrogen by disturbing gases to filter off others.
Description
Technical field
It the utility model is related to a kind of hydrogen gas sensor, more particularly to a kind of hydrogen gas sensor of high selectivity.
Background technology
With the progress and the improvement of people's living standards of society, automobile plays in the daily production and life of people
More and more important role.Orthodox car is all using oil as power source, with CO, CO after oil combustion2、NO、NO2、SO2、
Dust particle etc. is discharged into air as end-product.With the increase year by year of car ownership, the energy of countries in the world is endangered
Machine and atmosphere pollution are increasingly severe, and atmosphere pollution 50% according to statistics is all as caused by the tail gas of motor vehicle emission.Although various countries
All using restricting driving, a series of measure such as congestion expense is collected to improve the atmosphere pollution as caused by vehicle exhaust, but at all
Solution still in automobile in itself, only solve the problems, such as that motor vehicle emission could effect a radical cure atmosphere pollution.So countries in the world are all
New-energy automobile is being widelyd popularize, new-energy automobile refers to using unconventional vehicle fuel as power resources, comprehensive vehicle
Dynamic Control and driving in terms of advanced technology, the technical principle of formation is advanced, has new technology, the automobile of new construction.
Current new-energy automobile mainly includes fuel-cell vehicle and electric automobile.Fuel-cell vehicle be using pure hydrogen as
The energy, with reference to the new-energy automobile that sets out of power performance exploitation of fuel cell；Electric automobile refers to using battery as power row
The motor-driven automobile of use sailed.Although the operation principle of the two is different, all it is zero-emission, is suitable for wideling popularize.Newly
Energy automobile is different from orthodox car, power source, technology, emission etc. is not only embodied in, in automobile manufacturing process
There are some details to be noted that such as fuel-cell vehicle uses pure hydrogen to have hydrogen container in the car, this is just to hydrogen storage as fuel
The sealing of tank and pipeline proposes requirement, once it is hardly imaginable that leakage consequence occurs.Current electric automobile generally uses
Lithium ion battery as power source, lithium electricity overshoot or it is short-circuit when inside battery material decompose and can produce hydrogen, make simultaneously
For battery temperature manage Main Means coolant when charging voltage reaches certain grade also can decompose produce hydrogen.
Hydrogen is a kind of colourless, tasteless, nontoxic, inflammable and explosive gas, when the hydrogen content in air reaches 4% just
It can explode.Hydrogen is due to colorless and odorless, and flame is transparent during burning, therefore it exists and is not easy to be found have by sense organ
Titanic peril.So needing to install hydrogen monitoring unit on new-energy automobile, let out with reaching real-time online detection hydrogen
Leakage or generation situation, escort for safety of person vehicle.
This special application scenarios with reference to automobile, it is desirable to which used hydrogen gas sensor monitors except satisfaction to Generally Recognized as safe
Field is used outside the General Requirement of gas sensor, should also have preferably selectivity, avoids being arranged by other power vehicles
The tail gas put influences to produce malfunction.
Currently used hydrogen gas sensor has electric chemical formula hydrogen gas sensor, fuel cell formula hydrogen gas sensor, catalysis combustion
Burning formula hydrogen gas sensor and semiconductor-type hydrogen gas sensor.There was only fuel cell formula in the hydrogen gas sensor of above-mentioned various principles
Hydrogen gas sensor can be with selective enumeration method hydrogen, and the hydrogen gas sensor of remaining principle is all broad spectrum type, that is to say, that to above-mentioned
The vehicle exhaust mentioned has been substantially all response (CO2Except dust particle).Catalytic combustion type sensor and semiconductor-type
Sensor Cleaning Principle is essentially identical, although such sensor cost, than relatively low, this sensor is to hydrocarbon class
The activity of compound is significantly higher than hydrogen, and alarm will be triggered when a small amount of hydrocarbon in environment be present, is not suitable for application
In automobile industry；Electric chemical formula hydrogen gas sensor is used as sensor barrier due to the noble metal catalyst using broad spectrum type
Gas barrier film be loose structure, and aperture is significantly greater than the size of gas molecule mentioned above, so to above-mentioned big
Portion gas molecule can be detected with electric chemical formula hydrogen gas sensor, if electric chemical formula hydrogen gas sensor is to CO activity
It is 30 times of hydrogen.Although fuel cell formula hydrogen gas sensor can with selective enumeration method hydrogen, due to its use it is micro-
Type fuel cell principle, the response time is very long, as long as its time required for reaching 80% transition has 10 minutes, completely can not
Applied to safety monitoring field.
It is many at present generally using the method for increase filter layer in order to obtain preferably selectivity in electrochemical sensor
Certain selectivity all is obtained added with filter layer in the sensor of commercialization, but this filter layer is generally with activated carbon etc.
Carried out by the method for pure physical absorption or the chemical reaction of consumption-type, the former the shortcomings that be first, activated carbon class material
Without selectivity, all there is filterability to majority of gas, two to carry out the activated carbon that electrochemical sensor small volume can fill few,
And activated carbon has certain saturated extent of adsorption, adsorptive hindrance gas also can not be just further continued for after absorption reaches saturation；Three
Activated carbon can also adsorb the moisture in air, and the activated carbon after adsorption moisture can have a strong impact on the response time of sensor.To disappear
Consumption reaction eager to learn provide the sensor of selectivity there is also it is same the problem of just can not when the material consumption that react is complete yet
Filtering interference gas.
In summary, due to current hydrogen gas sensor there is it is various the problem of, it is therefore desirable to exploitation is a kind of suitable
Together in the sensor of new-energy automobile in-car hydrogen detection, meet to should also have preferable selectivity outside requirement.
Utility model content
The technical problems to be solved in the utility model is, there is provided a kind of hydrogen gas sensor of high selectivity.
Technical scheme is used by the utility model solves its technical problem：A kind of hydrogen sensing of high stability is provided
Device, including housing, gas detection cell, had using the interference gas outside to hydrogen targeting catalytic action catalyst selection
Property filter layer and selective ventilated membrane, the gas detection cell, selective filter layer and selective ventilated membrane are respectively provided with
In the housing, and the selective filter layer is between the gas detection cell and selective ventilated membrane.
Preferably, the gas detection cell includes electrolysis plastid, the working electrode, right being arranged in the electrolyte body
Electrode and reference electrode；
The housing is provided with several contact pins, the working electrode, passes through lead and number respectively to electrode and reference electrode
Individual contact pin connects one by one.
Preferably, the working electrode is towards the selective ventilated membrane, it is described to electrode and reference electrode positioned at described
Working electrode is backwards to the side of the selective ventilated membrane.
Preferably, the working electrode, be porous gas diffusive electrode to electrode and reference electrode.
Preferably, the electrolysis plastid is liquid electrolyte, semi-solid electrolyte or solid electrolyte.
Preferably, the contact pin corresponds to the gas detection cell and is arranged on the side of the housing.
Preferably, the contact pin is arranged on the bottom of the housing.
Preferably, the selective ventilated membrane is poly tetrafluoroethylene, gathered fluoride film, polytetrafluoroethylene (PTFE)/hexafluoro third
Alkene copolymer film, the third vinyl ether copolymers of polytetrafluoroethylene (PTFE)/perfluor film, polyethylene/TFE copolymer film, polyimides
One or more combinations in film, silicone rubber membrane and fluorination silicone rubber membrane.
The hydrogen gas sensor of high selectivity of the present utility model, suitable for the hydrogen content of the environment such as new-energy automobile in-car
Monitoring, selective ventilated membrane is coordinated by selective filter layer, be available for hydrogen by disturbing gases, raising pair to filter off others
The selective enumeration method of hydrogen.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is the cross-sectional view of the hydrogen gas sensor of the embodiment of the utility model one；
Fig. 2 be the embodiment of the utility model one hydrogen gas sensor in gas detection cell electrode catalyst microstructure
Schematic diagram.
Embodiment
In order to which the technical characteristics of the utility model, purpose and effect are more clearly understood, it is detailed now to compare accompanying drawing
Illustrate specific embodiment of the present utility model.
As shown in figure 1, the hydrogen gas sensor of the embodiment of the utility model one, including housing 10, it is arranged in housing 10
Gas detection cell 20, selective filter layer 30 and selective ventilated membrane 40；It is single that selective filter layer 30 is located at gas detection
Between member 20 and selective ventilated membrane 40, to being filtered by gas, other interference gases in addition to the hydrogen are removed, hydrogen then may be used
By to gas detection cell 20.
Wherein, housing 10 plays the ballistic support effect of whole sensor, and inside has chamber supplied gas detection unit
20th, selective filter layer 30 and selective ventilated membrane 40 etc. are accommodating wherein.(bottom as shown in Figure 1) is provided with housing 10
Several contact pins, contact pin are connected with gas detection cell 20, are additionally operable to be connected with extraneous pcb board, in real time by gas detection cell 20
Caused electric signal sends extraneous pcb board to.
The material of housing 10 can be that PP, PC, ABS, nylon etc. have some strength and the high molecular polymer of toughness, anti-impact
Hit and vibration resistance is strong, and be preferably applied to the material of acidic electrolyte bath.
Gas detection cell 20 detects to the gas by selective filter layer 30.
Again as shown in figure 1, gas detection cell 20 includes electrolysis plastid 21, the working electrode being arranged in electrolysis plastid 21
22nd, to electrode 23 and reference electrode 24.Wherein working electrode 22, to electrode 23, reference electrode 24 respectively with electrolysis plastid 21 it is good
Good contact, to ensure the patency of mass transfer.Working electrode 22, can be same porous gas to electrode 23 and reference electrode 24
Diffusion electrode or different porous gas diffusive electrodes, active component therein, i.e. catalyst, can be golden (Au),
Rhodium (Rh), platinum (Pt), ruthenium (Ru), palladium (Pd), iridium (Ir), one or more of metals in silver-colored (Ag) mixture or
It can be carbon to support in above-mentioned metal or metal mixture on conductive carbon particle (porous carrier), conductive carbon particle therein
One or more of combinations in black, CNT or activated carbon；Preferred pair hydrogen has the catalyst of selective active, such as
Pt/ porous carriers, its microstructure can be as shown in Figure 2.
Electrolysis plastid 21 plays a part of transmitting proton, can be liquid electrolyte, semi-solid electrolyte or solid electrolytic
Matter, wherein the active component for transmitting proton can be sulfuric acid, nitric acid, phosphoric acid, benzene sulfonic acid, benzoic acid etc..Gas detection cell 20
Also include a shell with accommodating electrolysis plastid 21.In the hydrogen gas sensor, using constant potentiometric electrolysis in real time by the hydrogen in environment
Gas content is converted into the electric signal that can be detected, and realizes the detection of hydrogen.
Preferably, response speed is accelerated to shorten mass transfer distance with the contact mode that tiles between each electrode and electrolysis plastid 21
Degree.Further, working electrode 22 is towards selective filter layer 30 so that the object gas to come from selective filter layer 30 is straight
Be connected to up to working electrode 22 occur selective chemical reaction with this come have the function that further consumption interference gas；To electrode
23 and reference electrode 24 be located at working electrode 22 backwards to selective filter layer 30 side.Oxygen in environment is on to electrode 23
Chemically react, the closed loop of reaction is formed together with the chemical reaction on working electrode 22, ensure continuing for chemical reaction
Property；Reference electrode 24 is used to provide stable Zero Potential, prevents output signal by the chemical reaction on electrode and drift
Influence, ensure output stability.
Working electrode 22, electrode 23 and reference electrode 24 are connected one by one by lead with several contact pins respectively.Wherein, such as
Shown in Fig. 1, working electrode 22 is connected by lead 221 with contact pin 101, and electrode 23 is connected by lead 231 with contact pin 102,
Reference electrode 24 is connected by lead 241 with contact pin 103, realizes the propagation of electric signal.
By taking Fig. 1 sensor placement directions as an example, the top of housing 10 is provided with air admission hole and entered under test gas, housing 10
Inner bottom part can be provided with oxygen channel and supply oxygen in environment to enter in housing 10.After hydrogen enters from the top of housing 10, pass through waterproof
Filter membrane 40 and selective filter layer 30, enter wherein above gas detection cell 20；Oxygen as supply can be from gas
The bottom of detection unit 20 enters wherein.
Selective filter layer 30 is arranged between gas detection cell 20 and selective ventilated membrane 50, to entering housing 10
Gas is filtered.Selective filter layer 30 is the chemical filtering layer with catalytic action, by disturbing gas in the selectivity
The mode that is chemically reacted on filter layer 30 improves selectivity.Active component in selective filter layer 30 has been catalysis
Effect, do not consume, it is ensured that all there is preferable filtration in the whole life cycle of sensor.Selective filter
Layer 30 preferably uses the catalyst for having targeting catalytic action to interference gas, its active component can be golden (Au), rhodium (Rh),
Platinum (Pt), ruthenium (Ru), palladium (Pd), iridium (Ir), one or more of metals in silver-colored (Ag) mixture or support in leading
Above-mentioned metal or metal mixture on carbon particles, conductive carbon particle therein can be carbon black, CNT or activated carbon
In one or more of combinations.
Selective ventilated membrane 40 is closely knit non-porous, has water proofing property.Generally, gas molecule will must be adsorbed first in film by film
Surface, and then dissolve into film, then be desorbed and come out in film, because gas molecule structure and of different sizes its dissolve in film
Also made a big difference with the speed and ability of desorption.Due to gas molecule is of different sizes being capable of throughout curve ventilated membrane 40
Ratio it is also just different, greatly improve the selectivity of sensor；Hydrogen molecule is minimum, and structure is most simple, so in film
Dissolving desorption ability it is most strong, the hydrogen molecule entered in sensor also just at most.By being precisely controlled selective ventilated membrane
40 thickness controls the quantity into the hydrogen molecule of sensor internal, not only ensures preferable accuracy of detection but also avoided enter into
The linearity of more gases affect sensors.
Alternatively, selective ventilated membrane 40 can be polytetrafluoroethylene (PTFE) (PTFE) film, gather PVF (PVDF) film, be poly-
Tetrafluoroethylene/hexafluoropropylene copolymer (PFEP) film, the vinyl ether copolymers of polytetrafluoroethylene (PTFE)/perfluor third (PFA) film, polyethylene/
One in TFE copolymer (PETFE) film, polyimides (PI) film, silicon rubber (SR) film and fluorination silicon rubber (FSR) film
Kind or a variety of combinations.
When hydrogen gas sensor of the present utility model is detected：When target gas molecules reach sensor, exist first
Selective ventilated membrane 40 carries out the transmission of selectivity here, and most of hydrogen molecule is entered in sensor, most of to disturb gas
Body molecule stays in the environment；The gas molecule entered in sensor is further filtered in selective filter layer 30, is led to
Cross that chemical reaction can occur for interference gas and filter layer that hydrogen does not chemically react substantially further consumes interference gas；
The most laggard gas for crossing first two steps purification reaches occurs selective catalytic reaction on the working electrode 22 of gas detection cell 20,
Pass through the selective enumeration method for being implemented in combination with hydrogen of above-mentioned three step.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (8)
1. a kind of hydrogen gas sensor of high selectivity, it is characterised in that including housing (10), gas detection cell (20), use
Interference gas outside to hydrogen has the selective filter layer (30) of the catalyst of targeting catalytic action and selective ventilated membrane
(40), the gas detection cell (20), selective filter layer (30) and selective ventilated membrane (40) are arranged at the shell
In body (10), and the selective filter layer (30) be located at the gas detection cell (20) and selective ventilated membrane (40) it
Between；
The gas detection cell (20) includes electrolysis plastid (21), the working electrode being arranged in the electrolysis plastid (21)
(22), to electrode (23) and reference electrode (24) and the shell of the accommodating electrolysis plastid (21)；
The selective filter layer (30) is one kind gold supported in the gold on conductive carbon particle, rhodium, platinum, ruthenium, palladium, iridium, silver
Category or various metals mixture.
2. hydrogen gas sensor according to claim 1, it is characterised in that the housing (10) is provided with several contact pins, institute
State working electrode (22), electrode (23) and reference electrode (24) are connected one by one by lead with several contact pins respectively.
3. hydrogen gas sensor according to claim 2, it is characterised in that the working electrode (22) is towards the selectivity
Ventilated membrane (40), the working electrode (22) that is located to electrode (23) and reference electrode (24) are breathed freely backwards to the selectivity
The side of film (40).
4. hydrogen gas sensor according to claim 2, it is characterised in that the working electrode (22), to electrode (23) and
Reference electrode (24) is porous gas diffusive electrode.
5. hydrogen gas sensor according to claim 2, it is characterised in that it is described electrolysis plastid (21) be liquid electrolyte,
Semi-solid electrolyte or solid electrolyte.
6. hydrogen gas sensor according to claim 2, it is characterised in that the contact pin corresponds to the gas detection cell
(20) it is arranged on the side of the housing (10).
7. hydrogen gas sensor according to claim 6, it is characterised in that the contact pin is arranged on the bottom of the housing (10)
Portion.
8. according to the hydrogen gas sensor described in claim any one of 1-7, it is characterised in that the selective ventilated membrane (40) is
Poly tetrafluoroethylene, gathered fluoride film, polytetrafluoroethylene (PTFE)/hexafluoropropylene copolymer film, the vinethene of polytetrafluoroethylene (PTFE)/perfluor third
Co-polymer membrane, polyethylene/TFE copolymer film, polyimide film, silicone rubber membrane and fluorination silicone rubber membrane in one kind or
A variety of combinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621310402.2U CN207163964U (en) | 2016-12-01 | 2016-12-01 | The hydrogen gas sensor of high selectivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621310402.2U CN207163964U (en) | 2016-12-01 | 2016-12-01 | The hydrogen gas sensor of high selectivity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207163964U true CN207163964U (en) | 2018-03-30 |
Family
ID=61708420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621310402.2U Expired - Fee Related CN207163964U (en) | 2016-12-01 | 2016-12-01 | The hydrogen gas sensor of high selectivity |
Country Status (1)
| Country | Link |
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| CN (1) | CN207163964U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001268A (en) * | 2018-05-08 | 2018-12-14 | 佛山科学技术学院 | A kind of filter-type high precision electro chemical sensor |
| CN110865114A (en) * | 2019-11-01 | 2020-03-06 | 深圳国氢新能源科技有限公司 | Indoor hydrogen monitoring method and monitoring system |
| CN112229905A (en) * | 2020-09-08 | 2021-01-15 | 华中科技大学 | High-selectivity bulk acoustic wave resonance hydrogen sensor and preparation method thereof |
| CN115950922A (en) * | 2023-01-17 | 2023-04-11 | 湖南元芯传感科技有限责任公司 | Active filter, semiconductor gas sensor and preparation method of active filter |
-
2016
- 2016-12-01 CN CN201621310402.2U patent/CN207163964U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001268A (en) * | 2018-05-08 | 2018-12-14 | 佛山科学技术学院 | A kind of filter-type high precision electro chemical sensor |
| CN110865114A (en) * | 2019-11-01 | 2020-03-06 | 深圳国氢新能源科技有限公司 | Indoor hydrogen monitoring method and monitoring system |
| CN112229905A (en) * | 2020-09-08 | 2021-01-15 | 华中科技大学 | High-selectivity bulk acoustic wave resonance hydrogen sensor and preparation method thereof |
| CN115950922A (en) * | 2023-01-17 | 2023-04-11 | 湖南元芯传感科技有限责任公司 | Active filter, semiconductor gas sensor and preparation method of active filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180330 Termination date: 20181201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |