CN201788166U - CO sensor adopting composite solid electrolyte membrane - Google Patents
CO sensor adopting composite solid electrolyte membrane Download PDFInfo
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- CN201788166U CN201788166U CN201020510985XU CN201020510985U CN201788166U CN 201788166 U CN201788166 U CN 201788166U CN 201020510985X U CN201020510985X U CN 201020510985XU CN 201020510985 U CN201020510985 U CN 201020510985U CN 201788166 U CN201788166 U CN 201788166U
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Abstract
The utility model relates to a CO sensor, which comprises a gas filter, a CO air inlet separation plate, an upper gas diffusion layer, an insulation sealing ring, a rubber sealing ring, an electrolyte membrane assembly, a lower gas diffusion layer, an air inlet separation plate and a sensor casing, wherein the electrolyte membrane assembly is a composite solid electrolyte membrane electrode assembly for a proton exchange membrane fuel battery, the membrane electrode assembly consists of a composite solid electrolyte membrane and catalyst layers, the catalyst layers are positioned at both sides of the composite solid electrolyte membrane, catalysts are carrier type metal Pt or Au, and the composite solid electrolyte membrane consists of a polyfluortetraethylene microporous base membrane and perfluorosulfonic acid resin. The utility model has the advantages that by adopting the composite solid electrolyte membrane, the water loss rate of the CO sensor can be effectively reduced, the service life of the CO sensor can be prolonged, the method is simple and feasible, and at the same time, the cost of the CO sensor can be reduced.
Description
Technical field
The utility model relates to the CO sensor, relates in particular to electrochemical CO sensor, specifically is the CO sensor with solid electrolyte film.
Background technology
CO is a kind of colourless, tasteless, inflammable, poisonous, harmful gas, and aerial threshold limit value (TLV) is 50ppm, and blast is limited to 12.5-74%.The rough burning of all carbonaceous materials all can produce CO, therefore CO very easily produces and extensively exists, and common touch opportunity has occupational contact (as commercial production coal gas, steel-making, coking, mine operation, chemical industry etc.) to contact (as traffic jam, gas range fault, natural gas in home or gas leak etc.) with daily life.Because CO is bigger 200 times than oxygen with the binding ability of haemoglobin, after CO enters the blood of human body circulation system, will replace oxygen in a large number and combine with haemoglobin, cause hypoxemia, anoxic, thereby cause patient's headache, tinnitus, feel sick, suffocate etc.Therefore, it is very necessary and necessary carrying out accurately and effectively detecting with reporting to the police to the CO in the live and work environment.
Adopt instruments such as gas chromatography, infrared spectrum analyser can CO be detected, have advantages such as measuring accuracy height, sensitivity height, but ubiquity instrument and equipment heaviness, shortcoming such as not portable, with high costs, is difficult to realize in site measurement, is not suitable for dailyly generally using.The CO sensor that reaches actual application level at present mainly contains two kinds of semiconductor-type and electric chemical formulas, and semiconductor-type CO sensor adopts oxide semiconductor material to mainly contain SnO usually
2, ZnO and Fe
2O
3Deng as sensitive element, the semiconductor-type CO sensor of being announced as ZL 99109048.9, it has characteristics such as highly sensitive, that response is fast, measurement range is wide, but the resistance drift is big in air, power consumption is higher, there are deficiencies such as safety problem in heating element for semiconductor-type element ubiquity, be unsuitable for quantitative test and make portable equipment, limited the application of semiconductor-type CO sensor.By contrast, electrochemical CO sensor owing to have highly sensitive, favorable reproducibility, distinct advantages such as low in energy consumption, safe and reliable by extensive concern.
Electrochemical CO sensor is generally assembled according to certain structure by electrode, electrolyte, and electrolyte is the conductor between electrochemical sensor electrodes, can be acid solution, also can be alkaline solution.Early stage electrochemical CO sensor adopts liquid electrolyte more, the certain density sulfuric acid solution of general employing is as electrolyte, because sulfuric acid volume change in too dry or moist environment is bigger, make the sensor cisco unity malfunction, and there are problems such as burn into sulfuric acid leakage inevitably in this system, is therefore eliminated gradually.Develop with du pont company
Series is used as in solid electrolyte widespread use and the CO sensor owing to having high proton conductive, high water diffusivity and good chemistry and electrochemical stability for the perfluoro sulfonic acid membrane of representative.A kind of CO sensor of full solid state polymer electrolyte is disclosed in ZL 01252229.5, adopt perfluorinated sulfonic acid cation-exchange membrane (Nafion film) to replace traditional flowing electrolyte, with noble metal powder with the waterproof catalyst film of teflon bonding as electrode, compare with traditional CO sensor, adopt the sensor construction compactness of perfluoro sulfonic acid membrane, do not contain mobile electrolytic liquid, do not have problems such as leakage, corrosion.
Adopt perfluoro sulfonic acid membrane to replace traditional electrolyte sulfuric acid, can effectively prevent problems such as burn into leakage, pollution, but since perfluoro sulfonic acid membrane must be under the condition that has water to exist just can proton conducting, the water cut of its conductivity and film is linear, therefore in the process of sensor design, must introduce a water storage cavity, it is stable that thereby the liquid water content in the maintenance perfluoro sulfonic acid membrane keeps, and makes it have proton conductive performance preferably.The life-span of sensor and its percentage of water loss are closely related, introduce the gelinite of particulates such as inorganic silicon oxide, aluminium oxide preparation in ZL 03818281.5 in catch basin, thereby effectively lower the percentage of water loss of sensor, prolong CO sensor serviceable life.
Summary of the invention
The purpose of this utility model is to provide a kind of electrochemical CO sensor, and sensor adopts the composite solid electrolyte film, thereby reduces the percentage of water loss of CO sensor, prolongs CO sensor serviceable life, and reduces material cost.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of CO sensor comprises: gas filter, CO air inlet dividing plate, last gas diffusion layers, insulated enclosure circle, O-ring seal, dielectric film assembly, following gas diffusion layers, air inlet dividing plate and sensor housing; The filtrator side and below have bleeder vent, filtrator lower surface and CO air inlet dividing plate upper surface connect, CO air inlet dividing plate lower surface and dielectric film assembly upper surface connect, CO air inlet dividing plate has bleeder vent, the lower surface of dielectric film assembly connects with following gas diffusion layers upper surface, the lower surface of following gas diffusion layers contacts with the air inlet dividing plate, the air inlet dividing plate has bleeder vent, the cavity of air inlet dividing plate below housing is the cavity of water and air, it is characterized in that: the composite solid electrolyte membrane electrode assembly that described dielectric film assembly is a used in proton exchange membrane fuel cell, described composite solid electrolyte membrane electrode assembly is made of composite solid electrolyte film and catalyst layer, catalyst layer is positioned at the both sides of composite solid electrolyte film, catalyzer is metal Pt or Au, it is supported catalyst, described composite solid electrolyte film is made up of teflon micropore basal membrane and perfluorinated sulfonic resin, and perfluorinated sulfonic resin is coated in teflon micropore basal membrane both sides.
A kind of CO sensor described in the utility model is characterized in that: the thickness of described teflon micropore basal membrane is 5～30 μ m, porosity 〉=50%,
A kind of CO sensor described in the utility model, gas diffusion layers was the gas diffusion layers by 30～80% teflon and Preparation of Activated Carbon under last gas diffusion layers reached.
The utlity model has following advantage:
Adopt the composite solid electrolyte film, thereby effectively reduce the percentage of water loss of CO sensor, prolong CO sensor serviceable life, the method simple possible can reduce CO sensor cost simultaneously.
Description of drawings
The utility model is accompanying drawing 4 width of cloth altogether, wherein:
Fig. 1 adopts the CO sensor construction synoptic diagram of composite solid electrolyte membrane electrode assembly.
Fig. 2 adopts the output current value curve of CO sensor under different CO concentration of composite solid electrolyte membrane electrode assembly.
The CO sensor that Fig. 3 adopts the composite solid electrolyte membrane electrode assembly is 300,400 and response time curve during 500ppm in CO concentration.
Fig. 4 adopts the CO sensor percentage of water loss test curve of composite solid electrolyte membrane electrode assembly, and experimental temperature is 55 ℃.
In the accompanying drawing, 1-gas filter, 2-CO air inlet dividing plate, the last gas diffusion layers of 3-, 4-insulated enclosure circle, 5-O-ring seal, 6-composite solid electrolyte membrane electrode assembly, gas diffusion layers under the 7-, 8-air inlet dividing plate, 9-sensor outer housing.
Embodiment
Choosing the aperture is 0.05 μ m, and porosity is 80%, thickness be the porous Teflon microporous barrier of 15 μ m as basement membrane, it is immersed in the perfluorinated sulfonic acid ethanolic solution of 1wt%, take out after 15 minutes.Control butt film surface solution, place on 90 ℃ of hot platforms after the drying, adopt the perfluorinated sulfonic acid ethanolic solution spraying and above-mentioned basement membrane both sides of spraying equipment with 5wt%, spraying is back following dry 30 minutes in 100 ℃, spraying is dry so repeatedly, reach 120 μ m until composite membrane thickness, then composite membrane was put into 140 ℃ of following dryings of baking oven 4 hours, obtain CO sensor composite solid electrolyte film.The both sides that the slurry that method by spraying is formed precious metals pt catalyzer, perfluorinated sulfonic resin, isopropyl alcohol or methyl alcohol is sprayed at the composite solid electrolyte film obtain catalyst layer, and the catalyst loading amount is 0.5mg/cm
2
Weigh the activated charcoal of 3 grams, add 90ml isopropyl alcohol and fully stirring, make activated charcoal and ethanol or isopropyl alcohol slurry, weigh a certain amount of polytetrafluoroethyldispersion dispersion (concentration is 10wt%) and join in the above-mentioned slurry, fully stir back breakdown of emulsion in 90 ℃ of water-baths, adopt subsequently roll squeezer repeatedly roll extrusion obtain the gas diffusion layers that thickness is 300 μ m, the polytetrafluoroethylene content scope is 70% in the gas diffusion layers.
According to shown in Figure 1 the CO sensor is encapsulated.Sensor comprises: gas filter 1, CO air inlet dividing plate 2, last gas diffusion layers 3, insulated enclosure circle 4, O-ring seal 5, composite solid electrolyte membrane electrode assembly 6, following gas diffusion layers 7, air inlet dividing plate 8 and sensor outer housing 9.Gas filter side 1 and below have bleeder vent, gas filter 1 lower surface contacts with CO air inlet dividing plate 2, CO air inlet dividing plate 2 has bleeder vent, its lower surface contacts with last gas diffusion layers 3, last gas diffusion layers 3 lower surfaces contact with composite solid electrolyte membrane electrode assembly 6, the lower surface of composite solid electrolyte membrane electrode assembly 6 contacts with following gas diffusion layers 7, the lower surface of following gas diffusion layers 7 contacts with air inlet dividing plate 8, air inlet dividing plate 8 has bleeder vent, and its below is to be water and air in the cavity.After said modules installs successively, adopt capper to seal.
This CO sensor is carried out sensitivity, response time and percentage of water loss test.Figure 2 shows that the output current value curve of CO sensor under different CO concentration that adopts the composite solid electrolyte membrane electrode assembly, output current value and CO concentration value linear relationship are good, and when CO concentration was 500ppm, output current was 1200nA.Figure 3 shows that the CO sensor that adopts the composite solid electrolyte membrane electrode assembly is 300,400 and response time curve during 500ppm in CO concentration, among Fig. 3, the curve of band side's point is that CO concentration is the response time curve of 300ppm, the curve of band round dot is that CO concentration is the response time curve of 400ppm, the curve of band trigpoint is that CO concentration is the response time curve of 500ppm, when CO concentration is 300,400 and during 500ppm, t
90(be output current value reach stablize output valve 90%) all less than 10s, response characteristic is good.
Fig. 4 is for adopting the CO sensor percentage of water loss test curve of composite solid electrolyte membrane electrode assembly.Among Fig. 4, the curve of band side's point is the CO sensor percentage of water loss test curve with the Nafion212 film, the curve of band round dot is the CO sensor percentage of water loss test curve with the Nafion115 film, and the curve of band trigpoint is the CO sensor percentage of water loss test curve with the composite solid electrolyte membrane electrode assembly.Experiment be the CO sensor is put into air dry oven and keep 55 ℃ constant, regular weighing sensor weight, thereby calculating sensor percentage of water loss.As seen from Figure 4, the sensor that adopts Nafion212 film, Nafion115 film and composite solid electrolyte membrane electrode assembly after 30 days dehydration be respectively 0.77,0.6 and 0.52 gram, adopt the CO sensor percentage of water loss of composite solid electrolyte film significantly to reduce, but significant prolongation CO sensor life-time.
Claims (2)
1. a CO sensor comprises: gas filter (1), CO air inlet dividing plate (2), last gas diffusion layers (3), insulated enclosure circle (4), O-ring seal (5), dielectric film assembly (6), following gas diffusion layers (7), air inlet dividing plate (8) and sensor housing (9); Gas filter (1) side and below have bleeder vent, gas filter (1) lower surface and CO air inlet dividing plate (2) upper surface connect, CO air inlet dividing plate (2) lower surface and dielectric film assembly (6) upper surface connect, CO air inlet dividing plate (2) has bleeder vent, the lower surface of dielectric film assembly (6) connects with following gas diffusion layers (7) upper surface, the lower surface of following gas diffusion layers (7) contacts with air inlet dividing plate (8), air inlet dividing plate (8) has bleeder vent, the cavity of air inlet dividing plate (8) below housing is the cavity of water and air, it is characterized in that: described dielectric film assembly (6) is the composite solid electrolyte membrane electrode assembly of used in proton exchange membrane fuel cell, described composite solid electrolyte membrane electrode assembly is made of composite solid electrolyte film and catalyst layer, catalyst layer is positioned at the both sides of composite solid electrolyte film, catalyzer is metal Pt or Au, it is supported catalyst, described composite solid electrolyte film is made up of teflon micropore basal membrane and perfluorinated sulfonic resin, and perfluorinated sulfonic resin is coated in teflon micropore basal membrane both sides.
2. according to the described a kind of CO sensor of claim 1, it is characterized in that: the thickness of described teflon micropore basal membrane is 5～30 μ m, porosity 〉=50%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020510985XU CN201788166U (en) | 2010-08-30 | 2010-08-30 | CO sensor adopting composite solid electrolyte membrane |
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|---|---|---|---|
| CN201020510985XU CN201788166U (en) | 2010-08-30 | 2010-08-30 | CO sensor adopting composite solid electrolyte membrane |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360637A (en) * | 2011-09-16 | 2012-02-22 | 江苏汉鼎机械有限公司 | Pair twister and working method thereof |
| CN102706938A (en) * | 2012-06-26 | 2012-10-03 | 郑州炜盛电子科技有限公司 | Electrochemical carbonic oxide (CO) gas sensor and manufacturing method for same |
| CN103592352A (en) * | 2013-11-21 | 2014-02-19 | 吉林大学 | Fuel cell type CO sensor based on Nafion membrane and preparing method of sensor |
| CN113504285A (en) * | 2021-07-09 | 2021-10-15 | 杭州麦乐克科技股份有限公司 | Preparation method of formaldehyde electrochemical sensor membrane electrode |
| EP4067891A1 (en) * | 2021-04-01 | 2022-10-05 | Carrier Corporation | Durable electrochemical gas detection device |
-
2010
- 2010-08-30 CN CN201020510985XU patent/CN201788166U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360637A (en) * | 2011-09-16 | 2012-02-22 | 江苏汉鼎机械有限公司 | Pair twister and working method thereof |
| CN102360637B (en) * | 2011-09-16 | 2013-01-30 | 江苏汉鼎机械有限公司 | Pair twister and working method thereof |
| CN102706938A (en) * | 2012-06-26 | 2012-10-03 | 郑州炜盛电子科技有限公司 | Electrochemical carbonic oxide (CO) gas sensor and manufacturing method for same |
| CN103592352A (en) * | 2013-11-21 | 2014-02-19 | 吉林大学 | Fuel cell type CO sensor based on Nafion membrane and preparing method of sensor |
| EP4067891A1 (en) * | 2021-04-01 | 2022-10-05 | Carrier Corporation | Durable electrochemical gas detection device |
| CN113504285A (en) * | 2021-07-09 | 2021-10-15 | 杭州麦乐克科技股份有限公司 | Preparation method of formaldehyde electrochemical sensor membrane electrode |
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Granted publication date: 20110406 |