CN202471646U - Methanol concentration sensor - Google Patents
Methanol concentration sensor Download PDFInfo
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- CN202471646U CN202471646U CN2011205647240U CN201120564724U CN202471646U CN 202471646 U CN202471646 U CN 202471646U CN 2011205647240 U CN2011205647240 U CN 2011205647240U CN 201120564724 U CN201120564724 U CN 201120564724U CN 202471646 U CN202471646 U CN 202471646U
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Abstract
The utility model provides a methanol concentration sensor which comprises a pipe, wherein the pipe is provided with a methanol solution inlet and a methanol solution outlet; a cathode collector plate, a membrane electrode, an anode collector plate and a supporting plate are arranged in sequence between the inlet and the outlet of the pipe; a sealing part is arranged between the cathode collector plate and the anode collector plate; the membrane electrode comprises a cathode diffusion layer, a cathode catalyst layer, a proton exchange membrane, an anode catalyst layer and an anode diffusion layer, which are arranged in sequence; and the cathode diffusion layer and the cathode collector plate are in contact with each other. The methanol concentration sensor works based on electrochemical detection. Since the electrochemical detection is highly stable, the methanol concentration sensor provided by the utility model has high stability in detecting a methanol solution and is convenient to operate.
Description
Technical field
The utility model relates to the methanol fuel cell field, particularly a kind of methanol concentration sensor.
Background technology
Methanol fuel cell is a kind of device that directly chemical energy of methyl alcohol is converted into electric energy.With respect to gas-fed fuel cell, methanol fuel cell is easy to deposit and transportation, has higher energy conversion efficiency; Need not outer the reformation and hydrogen purification device; Be easy to carry and store, reaction product is mainly water and a spot of carbon dioxide, is environmentally friendly green energy resource.
Methanol fuel cell has higher requirement to the concentration of methanol fuel, uses the methanol solution of higher concentration if this is, the fuel infiltration problem that easy generation is comparatively serious.This not only can bring mixed potential to cathode side, reduces cell output voltage; Simultaneously this fuel infiltration also can bring battery life to descend, fuel availability low with problems such as working time is short.Therefore, the methanol solution of existing methanol fuel cell all is low concentration methanol solutions of certain limit, has only methanol feedstock when certain concentration range, and methanol fuel cell just can obtain good operational effect.In order to guarantee the chemical property of methanol fuel cell, prior art need adopt concentration sensor to measure the concentration of methyl alcohol usually, regulates methanol concentration to suitable scope whereby.
Prior art provides the detection method of multiple methanol concentration, mainly comprises physics method and chemical method, and wherein people such as physics method such as Hengbing Zhao has introduced based on density in " Journal of Power Sources159 (2006) 626-636 "; Electric capacity, viscosity, the velocity of sound; Infrared; Refraction index, thermal capacitance, the sensor of phenomenons such as temperature rise.Chemical method such as Xie Jingyi etc. (chemical journal Vol.65,2007 the 6th phases, 532～536) have measured the catalysis fluorescence phenomenon when gas methyl alcohol exists; C.W.Lin etc. use materials such as gold electrode and polypyrrole to make membranaceous sensor in " Materials Chemistry and Physics 55,1998,139-144 " on aluminium base, and the film resistance when existing through measurement methyl alcohol changes and obtains methanol concentration; Kyongsoo Lee etc. use CNT and Nafion to process sensor in " CARBON 49 (2011) 787-792 ", also are the variations of measuring resistance; The SnO 2 thin film that J.K.Srivastava etc. use massicot to mix in " Journal of Natural Gas Chemistry 20 (2011) 179-183 " is made sensor; M.mabrook etc. use titania-poly-vinylidene-fluoride composite film in " Sensors and actuators, B 75 (2001) 197,202 ", also all be to obtain concentration information through measuring resistance or electric current.But the ubiquitous problem of above-mentioned methanol concentration sensor is: detect stability and have much room for improvement.
The utility model content
The technical matters that the utility model solves is to provide a kind of high methanol concentration sensor of stability that detects.
In view of this, the utility model provides a kind of methanol concentration sensor, comprising:
The inlet 101 of said pipeline and export 102 between be provided with cathode collector plate 2, membrane electrode 3, anode current collector plate 4, back up pad 5 successively; Be provided with sealing 6 between said cathode collector plate 2 and the back up pad 5;
Said membrane electrode 3 comprises cathode diffusion layer 301, cathode catalyst layer 302, PEM 303, anode catalyst layer 304 and the anode diffusion layer 305 that sets gradually, and said cathode diffusion layer 301 contacts with cathode collector plate 2.
Preferably, said anode current collector plate is provided with plate lead 411; Said cathode collector plate is provided with cathode leg 211.
Preferably, also comprise housing, said housing is sheathed on the outside of said pipeline, cathode collector plate, membrane electrode, anode current collector plate, back up pad and sealing.
The utility model provides a kind of methanol concentration sensor, and it comprises the pipeline that is provided with methanol solution import and outlet; Between entrance and outlet, be disposed with cathode collector plate, membrane electrode, anode current collector plate, back up pad, be provided with sealing between cathode collector plate and the back up pad.During use, methanol solution gets into through the methanol solution inlet of pipeline, and the part methanol solution arrives anode catalyst layer through the PEM of sensor; Anode catalyst with add under the effect of constant voltage; The methyl alcohol that infiltration is come is oxidized, and release of carbon dioxide produces proton; Proton is reduced to hydrogen under electric field action, arriving negative electrode through PEM.The part methanol solution flows out through the methanol solution outlet.In the said process, the size of current of electrooxidation is directly proportional with the infiltration concentration of methanol solution of coming, and the methanol concentration of infiltration is directly proportional with methanol concentration in the detection solution, and promptly size of current is directly proportional with methanol concentration.Those skilled in the art can obtain the concentration of methanol solution to be measured according to oxidation current.The methanol concentration sensor that the utility model provides is to adopt electrochemical assay to detect, because electrochemical assay has advantages of higher stability.Therefore, the methanol concentration sensor that adopts the utility model to provide detects methanol solution has advantages of higher stability, and easy and simple to handle.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the methanol concentration sensor that Fig. 1 provides for the utility model embodiment 1;
The structural representation of membrane electrode in the methanol concentration sensor that Fig. 2 provides for the utility model embodiment 1;
The structural representation of the methanol concentration sensor that Fig. 3 provides for the utility model embodiment 2;
Fig. 4 is the working curve of methanol concentration sensor;
Fig. 5 is sensor current-time curve.
Embodiment
In order further to understand the utility model; Below in conjunction with embodiment the utility model preferred embodiment is described; Describe just to further specifying the feature and advantage of the utility model but should be appreciated that these, rather than to the restriction of the utility model claim.
The utility model embodiment 1 discloses a kind of methanol concentration sensor, and its structure is as shown in Figure 1, and arrow is represented the trend of methanol solution among Fig. 1, and this methanol concentration sensor comprises:
Anode current collector plate 4;
Back up pad 5;
Said pipeline 1 is provided with methanol solution inlet 101 and methanol solution outlet 102;
Said cathode collector plate 2, membrane electrode 3, anode current collector plate 4, back up pad 5 are set in turn in the inlet 101 of pipeline 1 and export between 102;
Be provided with sealing 6 between said cathode collector plate 2 and the back up pad 5;
Be illustrated in figure 2 as the structural representation of membrane electrode in the methanol concentration sensor; Membrane electrode comprises cathode diffusion layer 301, cathode catalyst layer 302, PEM 303, anode catalyst layer 304 and the anode diffusion layer 305 that sets gradually, and said cathode diffusion layer 301 contacts with cathode collector plate 2.
The above-mentioned methanol concentration sensor that the utility model provides is to utilize electrochemical assay to detect methanol concentration, and the detection principle of this concentration sensor is following:
Methanol solution gets into through the methanol solution inlet 101 of pipeline 1; The PEM 303 of part methanol solution through sensor arrives anode catalyst layers 304, anode catalyst with add under the effect of constant voltage, the methyl alcohol that infiltration is come is oxidized; Release of carbon dioxide produces proton; Proton arrives negative electrode through PEM 303 under electric field action, be reduced to hydrogen.The part methanol solution flows out through methanol solution outlet 102.
In said process, the size of current of electrooxidation is directly proportional with the infiltration concentration of methanol solution of coming, and the methanol concentration of infiltration is directly proportional with methanol concentration in the original solution, and promptly size of current is directly proportional with methanol concentration.Thus; When using the methanol solution of normal concentration to test its electrooxidation electric current at a certain temperature; Just can obtain a working curve; Those skilled in the art can use above-mentioned concentration sensor to detect the electric current that methanol solution to be measured produces, and obtain the change in concentration of actual methanol solution to be measured according to this working curve.
The anode diffusion layer 4 and the cathode diffusion layer 2 of above-mentioned membrane electrode can adopt carbon paper or carbon cloth.Anode catalyst and cathod catalyst can adopt platinum and platinum ruthenium black, and PEM can adopt the perfluorinated sulfonic acid PEM.
In the above-mentioned methanol concentration sensor, pipeline 1 is used to carry methanol solution, and it can adopt tygon, polypropylene, polyester, polycarbonate, polyethersulfone etc. that the free of contamination plastics of battery are processed.
Anode current collector plate 4 is used for linking to each other with the positive pole of external power supply; Its anode with membrane electrode 3 closely contacts; The carbon dioxide that the anode methanol oxidation produces is diffused in the air through the hole of anode current collector plate or currect collecting net, and the electronics that anode produces is delivered to the positive pole of external power supply through anode current collector plate or currect collecting net.Anode current collector plate 4 also can adopt the graphite cake that is provided with bar-shaped trough, perhaps stainless (steel) wire.
The effect of back up pad 5 mainly is that membrane electrode 3 harmonizing yinyang utmost point collector plate are fixed to the inlet 101 of pipeline 1 and export between 102, guarantees that simultaneously the collector plate of anode and cathode fully contacts with the surface of membrane electrode.
Can know that by foregoing the methanol concentration sensor that the utility model provides is to adopt electrochemical assay to detect, because electrochemical assay has advantages of higher stability.Therefore, the methanol concentration sensor that adopts the utility model to provide detects methanol solution has advantages of higher stability, and easy and simple to handle.
The utility model embodiment 2 provides a kind of methanol concentration sensor, and its structure is as shown in Figure 3, and the difference of methanol concentration sensor that present embodiment provides and embodiment 1 is:
Anode current collector plate 4 is provided with plate lead 411;
Cathode collector plate 2 is provided with cathode leg 211.
When detecting concentration of methanol solution, the both positive and negative polarity that adds constant voltage is connected with the plate lead of anode current collector plate and the cathode leg of cathode collector plate respectively, and then is convenient to detect, simplify the operation.
As preferred version; The electronic component of the measuring current of also can connecting between cathode leg and the plate lead; When between plate lead and cathode leg, applying constant voltage, methyl alcohol is arranged simultaneously when the negative electrode of membrane electrode is penetrated into anode, the methyl alcohol that infiltration is come will be by electrooxidation; The electric current that produces can detect and export demonstration by element to be tested, and then is convenient in time observe testing result.
In addition, getting into sensor internal for fear of impurity influences measuring accuracy, the also preferred outside sheathed housing at pipeline, cathode collector plate, membrane electrode, anode current collector plate, back up pad and sealing of the utility model.Simultaneously, housing also plays the effect of protection to internal components, prolongs the serviceable life of sensor.
Adopt methanol concentration sensor as shown in Figure 3, wherein pipeline is a polythene material; The cathode collector plate is graphite bar shaped flow field; The effecting reaction area of membrane electrode is 1cm
2, anode diffusion layer and cathode diffusion layer are carbon paper, anode catalyst and cathod catalyst are respectively platinum and platinum ruthenium black; Sealing is a silica gel sealing ring; The anode current collector plate is gold-plated stainless (steel) wire.
Cathode leg links to each other with the negative pole of external power supply; Plate lead links to each other with the positive pole of external power supply; Between plate lead and cathode leg, apply constant voltage, in pipeline, inject the standard methanol solution of variable concentrations and write down sensor current, obtain the relation curve of methanol concentration and sensor current thus at 30 ℃; Be the working curve of methanol concentration sensor, working curve is as shown in Figure 4.As can beappreciated from fig. 4, the electrooxidation electric current of methyl alcohol is directly proportional with methanol concentration, therefore can be used as the sensor of methanol concentration.
Working concentration is that the methanol solution of 3M carries out continuous 70 hours concentration detection, is illustrated in figure 5 as sensor current-time curve.Can be known that by Fig. 5 sensor is in about 70 hours continuous monitoring process, the decline rate of its electric current is about 0.06mA/ hour; But consider that methyl alcohol is not added in the experimentation; And will cause the concentration of methyl alcohol to descend a little through volatilization, though solution is at temperature constant state in addition, sensor places air ambient; Environment temperature also can exert an influence to sensor, so can find out that sensor has good stable property.
The explanation of above embodiment just is used for helping to understand the utility model and core concept thereof.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (3)
1. a methanol concentration sensor is characterized in that, comprising:
Pipeline (1), said pipeline (1) are provided with methanol solution inlet (101) and methanol solution outlet (102);
Be provided with cathode collector plate (2), membrane electrode (3), anode current collector plate (4), back up pad (5) successively between inlet of said pipeline (101) and the outlet (102); Be provided with sealing (6) between said cathode collector plate (2) and the back up pad (5);
Said membrane electrode (3) comprises cathode diffusion layer (301), cathode catalyst layer (302), PEM (303), anode catalyst layer (304) and the anode diffusion layer (305) that sets gradually, and said cathode diffusion layer (301) contacts with cathode collector plate (2).
2. methanol concentration sensor according to claim 1 is characterized in that, said anode current collector plate is provided with plate lead (411); Said cathode collector plate is provided with cathode leg (211).
3. methanol concentration sensor according to claim 1 is characterized in that, also comprises housing, and said housing is sheathed on the outside of said pipeline, cathode collector plate, membrane electrode, anode current collector plate, back up pad and sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205647240U CN202471646U (en) | 2011-12-29 | 2011-12-29 | Methanol concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205647240U CN202471646U (en) | 2011-12-29 | 2011-12-29 | Methanol concentration sensor |
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| CN202471646U true CN202471646U (en) | 2012-10-03 |
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| CN2011205647240U Expired - Fee Related CN202471646U (en) | 2011-12-29 | 2011-12-29 | Methanol concentration sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998352A (en) * | 2012-12-18 | 2013-03-27 | 中国科学院长春应用化学研究所 | Methanol concentration sensor |
| CN105445311A (en) * | 2014-09-18 | 2016-03-30 | 财团法人工业技术研究院 | Liquid Concentration Detection Device |
| US10845324B2 (en) * | 2017-08-11 | 2020-11-24 | The Regents Of The University Of Michigan | Two-dimensional material based ion exchange membrane sensors |
| CN112687933A (en) * | 2020-12-30 | 2021-04-20 | 中科军联（张家港）新能源科技有限公司 | Alcohol fuel cell stack and concentration detection method thereof |
| CN116297692A (en) * | 2023-05-25 | 2023-06-23 | 江苏源氢新能源科技股份有限公司 | Testing device for proton exchange membrane |
-
2011
- 2011-12-29 CN CN2011205647240U patent/CN202471646U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998352A (en) * | 2012-12-18 | 2013-03-27 | 中国科学院长春应用化学研究所 | Methanol concentration sensor |
| CN105445311A (en) * | 2014-09-18 | 2016-03-30 | 财团法人工业技术研究院 | Liquid Concentration Detection Device |
| CN105445311B (en) * | 2014-09-18 | 2018-04-10 | 财团法人工业技术研究院 | Liquid concentration detection device |
| US10845324B2 (en) * | 2017-08-11 | 2020-11-24 | The Regents Of The University Of Michigan | Two-dimensional material based ion exchange membrane sensors |
| CN112687933A (en) * | 2020-12-30 | 2021-04-20 | 中科军联（张家港）新能源科技有限公司 | Alcohol fuel cell stack and concentration detection method thereof |
| CN116297692A (en) * | 2023-05-25 | 2023-06-23 | 江苏源氢新能源科技股份有限公司 | Testing device for proton exchange membrane |
| CN116297692B (en) * | 2023-05-25 | 2023-09-01 | 江苏源氢新能源科技股份有限公司 | Testing device for proton exchange membrane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20151229 |
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| EXPY | Termination of patent right or utility model |