CN2901304Y - Thermal electric film hydrogen sensor - Google Patents
Thermal electric film hydrogen sensor Download PDFInfo
- Publication number
- CN2901304Y CN2901304Y CN 200620042071 CN200620042071U CN2901304Y CN 2901304 Y CN2901304 Y CN 2901304Y CN 200620042071 CN200620042071 CN 200620042071 CN 200620042071 U CN200620042071 U CN 200620042071U CN 2901304 Y CN2901304 Y CN 2901304Y
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- China
- Prior art keywords
- hydrogen
- thermal electric
- electric film
- thermo
- transducer
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Abstract
The utility model relates to a thermo-electricity film hydrogen transducer. The utility model takes advantage of the radio frequency magnetron sputtering technology to produce the thermo-electricity film with high Seebeck quotient of Bi[0.5]Sb[1.5]Te[3] on the room temperature, bond catalyst layer on one end of the thermo-electricity film with heat conducting glue, guide voltage signal of the electric lead from the two sides of the thermo-electricity film with silver paste, mate the multiplying circuit module, digital display and multiplying circuit to assemble hydrogen transducer. The transducer has advantages of high sensitivity, good selectivity of hydrogen, simple structure, less energy consuming and low operation temperature to overcome the shortage of the conventional hydrogen transducer which is unable to accurately judge the explosion limit of the hydrogen concentration mixed with other combustible gas for broad spectrum effect to reducing gas. The utility model is widely applicable for various fields relating to hydrogen manufacture, storage and transport such as fuel battery automobile, mini- airplane, deep-sea apparatus, hydrogenation station, etc. to realize real-time monitor and alarm of the hydrogen concentration and guarantee safe use of the hydrogen energy.
Description
Technical field
The utility model relates to a kind of Leak Detection, measurement of concetration and explosion limits warning device of hydrogen, is specifically related to a kind of novel hydrogen gas sensor.
Background technology
Outstanding day by day along with the energy and environment problem, hydrogen receives increasing concern in environmental protection and strategic importance.Hydrogen has wide material sources, renewable, advantages such as calorific capacity is high, the cleaning of nontoxic, no burn into products of combustion, becomes the most desirable energy of alternative oil.The research of hydrogen gas sensor is the importance of Hydrogen Energy research, especially current application at aspects such as fuel cell car, minute vehicle, deep-sea device, hydrogenation stations is towards the exploitation of the microminiature senser element of the microkinetic hydrogen gas system emphasis problem that become international.
Hydrogen is the green energy resource of a kind of calorific capacity height, environmental protection, but has inflammable and explosive characteristic simultaneously again.When airborne hydrogen content within 4.65% to 93.9% scope time, running into naked light will blast, and makes Hydrogen Energy have very big danger in a series of processes such as production, storage, conveying, uses.The molecular radius of hydrogen is little, as long as there is micro pores to leak, simultaneously hydrogen has colourless, transparent, tasteless physical property, can't be even leak also by direct perception, and send light wavelength during hydrogen burning and belong to region of ultra-red, people's naked eyes can't be differentiated.All these character bring bigger difficulty all for the leakage monitoring of hydrogen, and the exploitation of high-performance hydrogen gas sensor is the important prerequisite that Hydrogen Energy is used.
The hydrogen gas sensor that generally uses mainly is galvanochemistry type and conductor oxidate type at present, but they in use have following deficiency respectively: electrochemical sensor easily produces corrosion to equipment, and volume is bigger, and gas-sensitive property is not ideal enough, and needs often to change electrolytic solution; And the working temperature height of conductor oxidate sensor (200-400 ℃), gas-selectively poor (inflammable gas is had broad spectrum response), and have shortcomings such as volume is big, quality weight, complex structure, the response time is long, the life-span is short.
Summary of the invention
That the purpose of this utility model is to prepare is simple in structure, cost is low, energy consumption is little, highly sensitive, small-sized hydrogen gas sensor that selectivity is good.
This thermal electric film hydrogen gas sensor is made based on the exothermic oxidation reaction of hydrogen and the Seebeck effect of thermoelectric material.Thermoelectric material is a kind ofly the functional material of heat energy and electric energy static conversion mainly can be applied to thermo-electric generation and thermoelectric cooling at present, but because its energy conversion rate is lower, is not used on a large scale yet so far.At this, we have designed a kind of hydrogen gas sensor of new construction, comprise two cores: the catalyzer of high Seebeck coefficient thermal electric film and high reaction activity, thus expanded the range of application of thermoelectric material, remedy the deficiency of existing hydrogen gas sensor, demonstrated fabulous effect.
Design of the present utility model is: prepare thermal electric film on matrix material, apply the quick catalyst layer of hydrogen at thermal electric film one end then, under the effect of catalyzer, hydrogen and oxygen react and emit a large amount of heat, and following equation: 2H is followed in its reaction
2(g)+O
2(g)=2H
2O (l)+569.6KJ/mol.This heat is heated thermal electric film one end rapidly, produces voltage signal after the moment formation temperature difference.Density of hydrogen is high more, and oxyhydrogen reaction Shaoxing opera is strong, and liberated heat is just many more, and the two ends temperature difference is just big more, and the voltage signal of output is high more.In preparation, have high specific surface area supported catalyst charge capacity by changing, acquisition can produce the catalyst layer of highest temperature difference under identical density of hydrogen condition.Obtain the P type Bi of thermoelectricity capability the best under the room temperature by radio-frequency magnetron sputter method
0.5Sb
1.5Te
3Semiconductive thin film, and at an end of film with both to stick the mode combination.Starch bonding silver-colored lead extraction voltage signal by silver, can form the detection core of thermal electric film hydrogen gas sensor.
The utility model is achieved by the following technical solution:
A kind of thermal electric film hydrogen gas sensor, it is characterized in that, described sensor has sensing detection part and signal Processing and output, sensing detection partly comprises: catalyst layer 1 is bonded on the thermal electric film layer 2 by heat-conducting glue, thermal electric film layer 2 by vacuum magnetic-control sputtering on glass or quartz substrate 3; Signal processing comprises a mlultiplying circuit module 6 and links to each other with numerical value display board 7 through an alarm 8; The signal of mlultiplying circuit module 6 is introduced negative pole and is partly linked to each other with negative electrode 4a on the catalyst layer 1 by lead 5, and the signal of mlultiplying circuit module 6 is introduced anodal part and passed through lead 5 and link to each other with anode 4b on the thermal electric film layer 2.
Beneficial effect
Simple in structure, advantages such as cost is low, light weight, energy consumption is little, highly sensitive, selectivity is good, response is fast that this thermal electric film hydrogen gas sensor has, and have demonstration of density of hydrogen numerical value and danger warning function, be a novel portable hydrogen sensor.
Description of drawings
The structural representation of the novel thermal electric film hydrogen gas sensor of Fig. 1
Wherein: 1-catalyst layer, 2-thermal electric film layer, 3-substrate, 4a-negative electrode, 4b-anode, 5-lead, 6-mlultiplying circuit module, 7-numerical value display board, 8-alarm.
The quick characteristic of the room temperature of Fig. 2 thermal electric film sensor (20-30 ℃) hydrogen (3% density of hydrogen)
Embodiment
Below in conjunction with accompanying drawing in detail and embodiment the utility model is further elaborated:
Embodiment
(1) preparation catalyst layer: with the activated carbon fiber cloth is carrier, selects chloroplatinic acid (H
2PtCl
66H
2O) be precursor, adopt equi-volume impregnating to prepare catalyst layer.At first with activated carbon fiber cloth earlier at 10% HNO
3Pre-service 150 minutes increasing its surperficial oxygen functional group, thereby further improves the adsorbability of activated carbon fiber cloth.At room temperature with certain density platinum acid chloride solution and activated carbon fiber cloth incipient impregnation, determine charge capacity then by control platinum acid chloride solution concentration, dip time and dipping number of times.Dipping finishes back following dry 120 minutes at 100 ℃.With pure hydrogen reduction catalyzer, accurately control reduction temperature with the temperature programme device.This catalyst layer is at room temperature to the sensing detection best results of hydrogen, is that the temperature difference that produces in the time of 30 ℃ can reach about 50 ℃ under 3% the same test gas at density of hydrogen, and along with operating temperature rises and the temperature difference descends.
(2) preparation thermal electric film layer: be that 99.9% Bi, Sb and Te powder mix and obtain the powder target by a certain percentage with purity, produce P type thermal electric film with rf magnetron sputtering equipment.Selection have high electric insulation, low heat conductivity can quartz be substrate, before the sputter earlier with substrate successively in acetone, deionized water, anhydrous alcohol with ultrasonic washing instrument concussion washing after 10 minutes 100 ℃ of oven dry.By the accurate assurance that parameters such as sputtering power, sputtering time, substrate temperature, base-range are investigated, preparing high performance component is Bi
0.5Sb
1.5Te
3P type film.
(3) sensor is integrated: catalyst layer and thermal electric film are glued together by heat-conducting glue, form thermal electric film sensing detection core.Connecting lead with silver slurry derives voltage signal and is passed into the mlultiplying circuit module with signal amplifying function, drive the numerical value display board and show concentration value in the current tested gas, and when density of hydrogen reaches warning value 3% by the alarm warning of sounding.The structure of this thermal electric film hydrogen gas sensor as shown in Figure 1.Its performance is tested, obtain the result as shown in Figure 2.At room temperature can produce the output voltage of 26.6mv in the hydrogen of (20-30 ℃) 3%, the response time is near 50s.Because this system just can start in room temperature, need not extraneous power supply heating, have advantage of low energy consumption.In addition, detected gas all has fabulous corresponding relation with density of hydrogen at heat and the output voltage that catalyst surface produces, can infer the density of hydrogen in the tested gas by measurement voltage signal, thereby realize the real-time monitoring of hydrogen leak and near explosion limits the time, report to the police.
Claims (1)
1, a kind of thermal electric film hydrogen gas sensor, it is characterized in that, described sensor has sensing detection part and signal Processing and output, sensing detection partly comprises: catalyst layer (1) is bonded on the thermal electric film layer (2) by heat-conducting glue, thermal electric film layer (2) by vacuum magnetic-control sputtering on glass or quartz substrate (3); Signal processing comprises a mlultiplying circuit module (6) and links to each other with numerical value display board (7) through an alarm (8); The signal of mlultiplying circuit module (6) is introduced negative pole and is partly linked to each other with negative electrode (4a) on the catalyst layer (1) by lead (5), and the signal of mlultiplying circuit module (6) is introduced the anodal lead (5) that partly passes through and linked to each other with anode (4b) on the thermal electric film layer (2)..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042071 CN2901304Y (en) | 2006-05-25 | 2006-05-25 | Thermal electric film hydrogen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042071 CN2901304Y (en) | 2006-05-25 | 2006-05-25 | Thermal electric film hydrogen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2901304Y true CN2901304Y (en) | 2007-05-16 |
Family
ID=38085468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620042071 Expired - Lifetime CN2901304Y (en) | 2006-05-25 | 2006-05-25 | Thermal electric film hydrogen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2901304Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102482766A (en) * | 2009-06-30 | 2012-05-30 | 欧-弗莱克斯科技有限公司 | Method for producing thermoelectric layers |
| CN104181202A (en) * | 2014-08-13 | 2014-12-03 | 中国电子科技集团公司第四十八研究所 | Multi-redundancy hydrogen sensor |
| CN107978131A (en) * | 2017-11-23 | 2018-05-01 | 中国汽车技术研究中心 | A kind of new mobile type hydrogen monitoring alarm |
| CN112505109A (en) * | 2020-11-12 | 2021-03-16 | 上海毅镤新能源科技有限公司 | Hydrogen sensor device based on thermoelectric effect and hydrogen detection method using same |
-
2006
- 2006-05-25 CN CN 200620042071 patent/CN2901304Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102482766A (en) * | 2009-06-30 | 2012-05-30 | 欧-弗莱克斯科技有限公司 | Method for producing thermoelectric layers |
| CN102482766B (en) * | 2009-06-30 | 2015-01-14 | 欧-弗莱克斯科技有限公司 | Method for producing thermoelectric layers |
| US9957602B2 (en) | 2009-06-30 | 2018-05-01 | Mahle International Gmbh | Method for producing thermoelectric layers |
| CN104181202A (en) * | 2014-08-13 | 2014-12-03 | 中国电子科技集团公司第四十八研究所 | Multi-redundancy hydrogen sensor |
| CN104181202B (en) * | 2014-08-13 | 2017-03-15 | 中国电子科技集团公司第四十八研究所 | A kind of many redundancy hydrogen gas sensors |
| CN107978131A (en) * | 2017-11-23 | 2018-05-01 | 中国汽车技术研究中心 | A kind of new mobile type hydrogen monitoring alarm |
| CN112505109A (en) * | 2020-11-12 | 2021-03-16 | 上海毅镤新能源科技有限公司 | Hydrogen sensor device based on thermoelectric effect and hydrogen detection method using same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070516 |
|
| EXPY | Termination of patent right or utility model |