CN107219287B - Ionic liquid electrochemical gas sensor - Google Patents
Ionic liquid electrochemical gas sensor Download PDFInfo
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- CN107219287B CN107219287B CN201710509887.0A CN201710509887A CN107219287B CN 107219287 B CN107219287 B CN 107219287B CN 201710509887 A CN201710509887 A CN 201710509887A CN 107219287 B CN107219287 B CN 107219287B
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- base
- electrode
- sensor
- upper cover
- ionic liquid
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- 239000002608 ionic liquid Substances 0.000 title claims abstract description 33
- 239000000428 dust Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229920000742 Cotton Polymers 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 11
- 229910000510 noble metal Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000011267 electrode slurry Substances 0.000 claims description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 239000012876 carrier material Substances 0.000 claims description 6
- OIWSIWZBQPTDKI-UHFFFAOYSA-N 1-butyl-3-methyl-2h-imidazole;hydrobromide Chemical compound [Br-].CCCC[NH+]1CN(C)C=C1 OIWSIWZBQPTDKI-UHFFFAOYSA-N 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- -1 methyltriethyl ammonium tetrafluoroborate Chemical compound 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 13
- 239000003792 electrolyte Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- IAZSXUOKBPGUMV-UHFFFAOYSA-N 1-butyl-3-methyl-1,2-dihydroimidazol-1-ium;chloride Chemical compound [Cl-].CCCC[NH+]1CN(C)C=C1 IAZSXUOKBPGUMV-UHFFFAOYSA-N 0.000 description 2
- WWFKDEYBOOGHKL-UHFFFAOYSA-N 1-ethyl-3-methyl-1,2-dihydroimidazol-1-ium;bromide Chemical compound Br.CCN1CN(C)C=C1 WWFKDEYBOOGHKL-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- LVHMJHXXLZIOOJ-UHFFFAOYSA-N C(CCC)N1CN(C=C1)C.[Br] Chemical compound C(CCC)N1CN(C=C1)C.[Br] LVHMJHXXLZIOOJ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- CXRFDZFCGOPDTD-UHFFFAOYSA-M Cetrimide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)C CXRFDZFCGOPDTD-UHFFFAOYSA-M 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- G01N27/413—Concentration cells using liquid electrolytes measuring currents or voltages in voltaic cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides an ionic liquid electrochemical gas sensor which comprises a sensor dust cover, an upper cover, electrodes, metal leads, liquid guide cotton adsorbed with ionic liquid and a base, wherein the upper cover is arranged on the sensor dust cover; the dust cover is arranged on the upper cover and forms an air chamber with the upper cover, and the air inlet and the air outlet are communicated with the air chamber; the base is an accommodating cavity with an opening at the upper part, and the liquid guide cotton, the metal lead, the electrode and the upper cover are sequentially arranged in the accommodating cavity from bottom to top; and the base is provided with a conductive belt, and the metal lead wire is connected with the electrode and the conductive belt. Compared with the traditional electrochemical gas sensor, the ionic liquid electrochemical gas sensor has the advantages of good stability, small temperature coefficient, strong liquid leakage resistance under high-temperature high-humidity conditions and the like.
Description
Technical Field
The invention relates to an electrochemical gas sensor, in particular to an ionic liquid electrochemical gas sensor.
Background
Conventional electrochemical gas sensors generally use aqueous solutions of inorganic acids and salts as electrolyte, and the electrolyte is easy to volatilize in air, so that the sensor performance is attenuated due to volatilization of the electrolyte in the use process, and the reliability of the sensor is affected.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides the ionic liquid electrochemical gas sensor which has good stability, small temperature coefficient and strong liquid leakage resistance under the conditions of high temperature and high humidity.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an ionic liquid electrochemical gas sensor comprises a sensor dust cover, an upper cover, an electrode, a metal lead, liquid guide cotton adsorbed with ionic liquid and a base; the dust cover is arranged on the upper cover and forms an air chamber with the upper cover, and the air inlet and the air outlet are communicated with the air chamber; the base is an accommodating cavity with an opening at the upper part, and the liquid guide cotton, the metal lead, the electrode and the upper cover are sequentially arranged in the accommodating cavity from bottom to top; and the base is provided with a conductive belt, and the metal lead wire is connected with the electrode and the conductive belt.
Based on the above, the sensor electrode is made of a noble metal catalyst supported on the surface of a supporting material, and includes a working electrode W, a counter electrode C, and a reference electrode R.
Based on the above, the counter electrode C and the reference electrode R are disposed in parallel on the supporting material, the working electrode W is disposed corresponding to the air outlet, and the cross-sectional area of the working electrode W is larger than the cross-sectional area of the air outlet.
Based on the above, the bottoms of the two ends of the base are provided with the bonding pads, and the conductive belt extends from the bonding pads to the bottom of the base along the inner wall of the base and over the upper edge of the base.
Based on the above, the metal lead is nichrome wire, iron-nickel alloy wire or platinum wire.
Based on the above, the ionic liquid comprises 1-butyl-3-methylimidazole chloride salt, 1-butyl-3-methylimidazole bromide salt, 1-ethyl-3-methylimidazole bromide salt, methyl triethyl ammonium tetrafluoroborate or 1-ethyl-1-methylpyrrolidine chloride.
Based on the above, the upper cover and the base are snap-connected and sealed with epoxy resin.
An ionic liquid electrochemical formaldehyde sensor based on the ionic liquid electrochemical gas sensor adopts noble metal Pt as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material, and a base, liquid-guiding cotton adsorbed with 1-butyl-3-methylimidazole bromine salt, the electrodes, an upper cover and a dust cover are assembled into the formaldehyde sensor respectively.
An ionic liquid electrochemical ammonia gas sensor based on the ionic liquid electrochemical gas sensor adopts noble metal Ru as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material PTFE film, and a base, liquid-guiding cotton adsorbed with ammonium methyltriethyl tetrafluoroborate, the electrodes, an upper cover and a dust cover are respectively assembled with the Cheng Anqi sensor.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, in particular, through the structural design, the ionic liquid with low saturated vapor pressure can be used as electrolyte, the ionic liquid is not easy to volatilize in the air, the electrolyte is stable compared with the conventional inorganic acid or salt electrolyte in the use process of the sensor, and the stability of the sensor is correspondingly improved. Compared with the traditional electrochemical gas sensor, the electrochemical gas sensor has the advantages of good stability, small temperature coefficient, strong liquid leakage resistance under high-temperature and high-humidity conditions and the like.
Drawings
Fig. 1 is an exploded view of an electrochemical ionic liquid sensor of the present invention.
Fig. 2 is a schematic diagram of the semi-assembled structure of the electrochemical ionic liquid sensor of the present invention.
Fig. 3 is a schematic diagram of the electrode structure of the electrochemical ionic liquid sensor of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail through the following specific embodiments.
As shown in fig. 1 and 2, an ionic liquid electrochemical gas sensor comprises a sensor dust cover 1, an upper cover 2, an electrode 3, a metal lead 4, liquid guide cotton 5 adsorbed with ionic liquid and a base 6; the dust cover 1 is covered on the upper cover 2, an air inlet hole is formed in the dust cover 1, an air outlet hole is formed in the upper cover 2, the dust cover 1 is covered on the upper cover 2 and forms an air chamber with the upper cover 2, and the air inlet hole and the air outlet hole are communicated with the air chamber; the base 6 is a containing cavity with an opening at the upper part, and the liquid guide cotton 5, the metal lead 4, the electrode 3 and the upper cover 2 are sequentially arranged in the air chamber from bottom to top; the base 6 is provided with a conductive belt b in a printing or spraying mode, the bottoms of the two ends of the base 6 are provided with bonding pads a, and the conductive belt b extends to the bottom of the base 6 from the bonding pads a along the inner wall of the base 6 and over the upper edge of the base 6. The metal lead 4 connects the electrode 3 and the conductive strip b, thereby realizing conduction of the sensor signal with an external circuit.
During specific assembly, the upper cover 2 and the base 6 are in snap connection and sealed by epoxy resin.
When the materials are specifically selected, according to different types of test gases, electrodes carrying different catalysts and specific types of ionic liquids are selected. The sensor can be used for detecting the components and the content of toxic and harmful gases such as carbon monoxide, hydrogen sulfide, ammonia, formaldehyde and the like.
The metal lead adopts a nichrome wire, an iron-nickel wire or a platinum wire.
The ionic liquid comprises 1-butyl-3-methylimidazole chloride, 1-butyl-3-methylimidazole bromide, 1-ethyl-3-methylimidazole bromide, methyl triethyl ammonium tetrafluoroborate or 1-ethyl-1-methylpyrrolidine chloride.
As shown in fig. 3, the sensor electrode includes a working electrode W, a counter electrode C and a reference electrode R, and is manufactured by using noble metal as a catalyst, adding a certain proportion of dispersing agent to prepare electrode slurry, and printing the electrode slurry on the surface of a supporting material. The counter electrode C and the reference electrode R are arranged on the carrying material in parallel, the working electrode W is arranged corresponding to the air outlet hole, and the cross section area of the working electrode W is larger than that of the air outlet hole.
Noble metal Pt is used as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material, and a base, liquid-guiding cotton adsorbed with 1-butyl-3-methylimidazole bromide, the electrodes, an upper cover and a dust cover are assembled into the formaldehyde sensor respectively. The sensitivity annual fluctuation rate of the sensor is 4.9%, and the temperature coefficient of 50 ℃ is 1.01.
Noble metal Ru is used as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material PTFE film, and a base, liquid guide cotton adsorbed with methyltriethyl ammonium tetrafluoroborate, the electrodes, an upper cover and a dust cover are respectively assembled with the Cheng Anqi sensor. Through testing, the sensitivity annual attenuation rate of the sensor is 9.5%, and the temperature coefficient of 50 ℃ is 1.03.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (4)
1. An ionic liquid electrochemical formaldehyde sensor based on an ionic liquid electrochemical gas sensor is characterized in that:
the ionic liquid electrochemical gas sensor comprises a sensor dust cover, an upper cover, an electrode, a metal lead, liquid guide cotton adsorbed with ionic liquid and a base; the dust cover is arranged on the upper cover and forms an air chamber with the upper cover, and the air inlet and the air outlet are communicated with the air chamber; the base is an accommodating cavity with an opening at the upper part, and the liquid guide cotton, the metal lead, the electrode and the upper cover are sequentially arranged in the accommodating cavity from bottom to top; the base is provided with a conductive belt, and the metal lead wire is connected with the electrode and the conductive belt;
the sensor electrode is made of a noble metal catalyst supported on the surface of a supporting material and comprises a working electrode W, a counter electrode C and a reference electrode R; the counter electrode C and the reference electrode R are arranged on the carrying material in parallel, the working electrode W is arranged corresponding to the air outlet, and the cross section area of the working electrode W is larger than that of the air outlet;
the bottoms of the two ends of the base are provided with bonding pads, and the conductive belt extends from the bonding pads to the bottom of the base along the inner wall of the base and over the upper edge of the base;
noble metal Pt is used as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material, and a base, liquid-guiding cotton adsorbed with 1-butyl-3-methylimidazole bromide, the electrodes, an upper cover and a dust cover are assembled into the formaldehyde sensor respectively.
2. The ionic liquid electrochemical formaldehyde sensor according to claim 1, characterized in that: the upper cover is connected with the base in a buckling way and is sealed by epoxy resin.
3. An ionic liquid electrochemical ammonia sensor based on an ionic liquid electrochemical gas sensor is characterized in that:
the ionic liquid electrochemical gas sensor comprises a sensor dust cover, an upper cover, an electrode, a metal lead, liquid guide cotton adsorbed with ionic liquid and a base; the dust cover is arranged on the upper cover and forms an air chamber with the upper cover, and the air inlet and the air outlet are communicated with the air chamber; the base is an accommodating cavity with an opening at the upper part, and the liquid guide cotton, the metal lead, the electrode and the upper cover are sequentially arranged in the accommodating cavity from bottom to top; the base is provided with a conductive belt, and the metal lead wire is connected with the electrode and the conductive belt;
the sensor electrode is made of a noble metal catalyst supported on the surface of a supporting material and comprises a working electrode W, a counter electrode C and a reference electrode R; the counter electrode C and the reference electrode R are arranged on the carrying material in parallel, the working electrode W is arranged corresponding to the air outlet, and the cross section area of the working electrode W is larger than that of the air outlet;
the bottoms of the two ends of the base are provided with bonding pads, and the conductive belt extends from the bonding pads to the bottom of the base along the inner wall of the base and over the upper edge of the base;
noble metal Ru is used as a catalyst, a dispersing agent is added to prepare electrode slurry, electrodes of the sensor are printed on a carrier material PTFE film, and a base, liquid guide cotton adsorbed with methyltriethyl ammonium tetrafluoroborate, the electrodes, an upper cover and a dust cover are respectively assembled with the Cheng Anqi sensor.
4. An ionic liquid electrochemical ammonia sensor as claimed in claim 3 wherein: the upper cover is connected with the base in a buckling way and is sealed by epoxy resin.
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| CN201710509887.0A CN107219287B (en) | 2017-06-28 | 2017-06-28 | Ionic liquid electrochemical gas sensor |
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| CN201710509887.0A CN107219287B (en) | 2017-06-28 | 2017-06-28 | Ionic liquid electrochemical gas sensor |
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| CN107219287B true CN107219287B (en) | 2023-11-17 |
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| CN107764179B (en) * | 2017-11-20 | 2024-02-13 | 汉威科技集团股份有限公司 | Low-power consumption valve rotation angle online monitoring device and online monitoring method thereof |
| CN111413387A (en) * | 2020-04-29 | 2020-07-14 | 广州钰芯传感科技有限公司 | Electrochemical gas sensor and electrode package thereof |
| CN113030221B (en) * | 2021-04-14 | 2023-03-10 | 武汉理工大学 | Hydrogen sensor and application thereof |
| CN115165985A (en) * | 2022-07-19 | 2022-10-11 | 华中科技大学 | Electrochemical hydrogen sulfide sensor based on ionic liquid and preparation method thereof |
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| CN107219287A (en) | 2017-09-29 |
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