CN205426841U - Hydrogen gas sensor - Google Patents
Hydrogen gas sensor Download PDFInfo
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- CN205426841U CN205426841U CN201521086628.4U CN201521086628U CN205426841U CN 205426841 U CN205426841 U CN 205426841U CN 201521086628 U CN201521086628 U CN 201521086628U CN 205426841 U CN205426841 U CN 205426841U
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Abstract
The utility model discloses a hydrogen gas sensor, include sensor housing (11), establish respectively sensor housing (11) the bottom first contact pin (111), second contact pin (112) and third contact pin (113) and establish in proper order sensor housing (11) are inside, and to be arranged in environment hydrogen gas shift be the signal of telecommunication, and pass through first contact pin (111), second contact pin (112) and third contact pin (113) are transmitted to gaseous detecting element (13) of external PCB board and are used for carrying oxygen extremely in real time oxygen supply passageway (12) of gaseous detecting element (13). Implement the beneficial effects of the utility model are that, can guarantee the sufficient supply of oxygen and whole chemical reaction's continuation through be equipped with independent oxygen supply passageway in sensor housing for this hydrogen gas sensor can be reliable and stable the long term operation under high concentration hydrogen environment.
Description
Technical field
This utility model relates to sensor field, more particularly, it relates to a kind of hydrogen gas sensor worked under high concentration hydrogen environment being suitable for long duration.
Background technology
Electrochemical hydrogen gas sensor is current most widely used hydrogen detection method, and cardinal principle is to utilize constant potentiometric electrolysis to carry out hydrogen detection.When environment there being hydrogen occur, hydrogen generates hydrion in the working electrode generation oxidation reaction of electrochemical sensor, oxygen is generating oxonium ion to electrode generation reduction reaction simultaneously, the hydrion and the oxonium ion that generate combine generation water under the conduction of electrolyte, and whole reaction is smoothly completed.Concrete reaction equation is as follows:
Working electrode: H2→2H++2e-
To electrode: O2+2e-→2O-
Overall reaction: H2+O2→H2O
By above-mentioned reaction equation it can be seen that in electrochemical reaction oxygen be necessary, only have abundance oxygen supply, whole reaction could complete smoothly.When oxygen supply deficiency in system, reaction cannot be normally carried out down, and sensor also would not output again.
Although and traditional electrochemical hydrogen gas sensor have Monitoring lower-cut than relatively low, respond the advantages such as rapid, cheap, but whole system is not reserved oxygen channel, only by sensor assembling process being sealed in the trace oxygen of sensor internal to support its reaction.If desired the hydrogen content detected is the highest, then sensor is sealed up for safekeeping in the closed loop that the trace oxygen of electrode zone can ensure that reaction when assembling, but when the density of hydrogen needing detection is up to more than 10%, the trace oxygen sealed up for safekeeping in sensor cannot meet the demand of reaction, and the oxygen in external environment cannot arrive electrode due to the block in design after entering in sensor, then be bound to the signal attenuation phenomenon occurring causing due to anoxia when this hydrogen gas sensor carries out high concentration hydrogen detection, this sensor also cannot be applied to the persistence detection of high concentration hydrogen.
Utility model content
The technical problems to be solved in the utility model is, oxygen channel is not reserved for existing hydrogen gas sensor, the defect that oxygen supply is not enough is easily caused, it is provided that a kind of hydrogen gas sensor worked under high concentration hydrogen environment being suitable for long duration when needing the density of hydrogen height of detection.
This utility model solves its technical problem and be the technical scheme is that a kind of hydrogen gas sensor of offer, including sensor housing, be respectively provided at the first contact pin bottom described sensor housing, the second contact pin and the 3rd contact pin and be sequentially arranged within described sensor housing for the hydrogen in environment being converted to the signal of telecommunication, and the gas detection cell by described first contact pin, the second contact pin and the 3rd contact pin transmission to extraneous pcb board and the oxygen supply passage for conveying oxygen in real time to described gas detection cell.
In above-mentioned hydrogen gas sensor, described gas detection cell includes working electrode, working electrode lead-in wire, to electrode, to contact conductor, reference electrode, reference electrode lead-in wire and electrolyte；
Wherein: described working electrode and the described opposite sides that electrode, reference electrode are respectively arranged on described electrolyte, described working electrode, electrode, reference electrode are gone between by described working electrode respectively, contact conductor and described reference electrode are gone between and described first contact pin, the second contact pin and the 3rd contact pin connect one to one with transmitting telecommunication number to external world's pcb board.
In above-mentioned hydrogen gas sensor, hydrogen inlet faced by described working electrode is so that the hydrogen molecule in environment arrives described working electrode generation electrochemical reaction；Described to electrode and described reference electrode in the face of described oxygen supply passage so that oxygen in environment described to electrochemical reaction occurs on electrode.
In above-mentioned hydrogen gas sensor, described working electrode, electrode and described reference electrode are respectively identical porous gas diffusive electrode.
In above-mentioned hydrogen gas sensor, described working electrode, electrode and described reference electrode are respectively different porous gas diffusive electrodes.
Implement hydrogen gas sensor of the present utility model, have the advantages that sufficient supplies and the persistence of whole chemical reaction that can ensure that oxygen by being provided with independent oxygen supply passage in sensor shell body so that the long-term work that this hydrogen gas sensor can be reliable and stable is under high concentration hydrogen environment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of this utility model hydrogen gas sensor preferred embodiment；
Fig. 2 is the response curve that 18% hydrogen is monitored by this utility model hydrogen gas sensor continuously.
Detailed description of the invention
In order to be more clearly understood from technical characteristic of the present utility model, purpose and effect, now comparison accompanying drawing describes detailed description of the invention of the present utility model in detail.
As it is shown in figure 1, be the structural representation of this utility model hydrogen gas sensor preferred embodiment.In the present embodiment, this hydrogen gas sensor includes sensor housing 11, is located at the first contact pin 111 bottom sensor housing 11, the second contact pin the 112, the 3rd contact pin 113 and the 4th contact pin 114 and be sequentially arranged at the gas detection cell 13 within sensor housing 11 and oxygen supply passage 12.
Wherein: sensor housing 11 is hollow structure, play the ballistic support effect of whole hydrogen gas sensor, the material of sensor housing 11 can be the high molecular polymer that PP, PC, ABS, nylon etc. have some strength and toughness, preferably goes for the material of acidic electrolyte bath.Gas detection cell 13 for being converted to the signal of telecommunication by the content of hydrogen in environment, and is transferred to extraneous pcb board by first contact pin the 111, second contact pin the 112, the 3rd contact pin 113 bottom sensor housing 11.Oxygen supply passage 12 then carries oxygen in real time for this hydrogen gas sensor, to ensure that this hydrogen gas sensor can work under high concentration hydrogen environment with long time stability, its material is equally the high molecular polymer that PP, PC, ABS, nylon etc. have some strength and toughness.
This utility model hydrogen gas sensor uses constant potentiometric electrolysis to carry out the detection of hydrogen, specifically, gas detection cell 13 by working electrode 131, working electrode lead-in wire 132, to electrode 133, to contact conductor 134, reference electrode 135, reference electrode lead-in wire 136 and electrolyte 137 form.Wherein working electrode 131, to electrode 133, reference electrode 135 respectively with electrolyte 137 good contact, to ensure the patency of mass transfer.In the present embodiment, working electrode 131 and the opposite sides that electrode 133, reference electrode 135 are respectively arranged on electrolyte 137, be equivalent to the working electrode 131 one side at electrolyte 137, to electrode 133 and reference electrode 135 at the another side of electrolyte 137.Need exist for explanation be, electrolyte 137 in the present embodiment can be liquid electrolyte, semi-solid electrolyte or solid electrolyte, and when for liquid electrolyte, electrolyte can be carried out package process or be adsorbed by carriers such as Cotton Gossypiis, it is made to embody with solid forms in a word, it is prior art herein, repeats no more.Electrolyte 137 plays the effect of transmission proton, and the active component wherein transmitting proton can be sulphuric acid, nitric acid, phosphoric acid, benzenesulfonic acid, benzoic acid etc..
It addition, working electrode 131, to electrode 133 and reference electrode 135 respectively by working electrode lead-in wire 112, go between 136 propagation being connected with first contact pin the 111, second contact pin 112 on sensor housing 11 and the 3rd contact pin 113 one_to_one corresponding to realize the signal of telecommunication to contact conductor 134 and reference electrode.In this hydrogen gas sensor, working electrode 131 in gas detection cell 13 is in the face of hydrogen inlet (not shown), this import can allow the hydrogen in environment enter so that the target gas molecules in environment i.e. hydrogen molecule directly arrives working electrode 131 and electrochemical reaction occurs；To oxygen supply passage 12 faced by electrode 133 and reference electrode 135, as shown in the figure, it is internal that oxygen in environment reaches sensor housing 11 endlessly by this oxygen supply passage 12, and to chemical reaction occurs on electrode 133, the closed loop of reaction is formed together with the chemical reaction occurred on working electrode 131 with hydrogen, ensure the persistence of chemical reaction, also ensure that the performance of whole hydrogen gas sensor.Reference electrode 135 is used for providing stable Zero Potential, prevents output signal from being affected by the chemical reaction on electrode 133 and drift, it is ensured that the stability of output.
Working electrode 131 therein, can be same porous gas diffusive electrode to electrode 133 and reference electrode 135, it can also be different porous gas diffusive electrodes, active component therein, i.e. catalyst, it can be gold (Au), rhodium (Rh), platinum (Pt), ruthenium (Ru), palladium (Pd), iridium (Ir), the mixture of one or more metals in silver (Ag), can also be to support the above-mentioned metal on conductive carbon particle or metal mixture, conductive carbon particle therein can be carbon black, the combination of one or more in CNT or activated carbon.
Compared to prior art, this utility model hydrogen gas sensor includes being sequentially arranged in the gas detection cell in sensor shell body and independent oxygen supply passage, and gas detection cell includes working electrode, to electrode and reference electrode, hydrogen inlet faced by working electrode, and to oxygen supply passage faced by electrode and reference electrode.When environment has hydrogen, oxidation reaction is occurred to generate hydrion on hydrogen working electrode in gas detection cell, carried oxygen in real time by oxygen supply passage simultaneously, and electrode generation reduction reaction is being generated oxonium ion, the hydrion and the oxonium ion that generate combine generation water under the conduction of electrolyte, and whole reaction is smoothly completed.Therefore can ensure that sufficient supplies and the persistence of whole chemical reaction of oxygen by being provided with independent oxygen supply passage in sensor shell body so that the long-term work that this hydrogen gas sensor can be reliable and stable is under high concentration hydrogen environment.
In order to verify main performance when this utility model hydrogen gas sensor carries out actually detected, test detection performance when this hydrogen gas sensor hydrogen content in the environment is up to 18%, the most as shown in Figure 2.As can be seen from the figure, in the experimentation of by a definite date two weeks, this utility model hydrogen gas sensor exports more stable always, and the hydrogen gas sensor that British city technology company model is 7HYT as a comparison has occurred as soon as decay after experiment starts 5 minutes, to decay when 31 minutes, completely, output signal returns to not have value during hydrogen.
Above in conjunction with accompanying drawing, embodiment of the present utility model is described; but this utility model is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematically; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; in the case of without departing from this utility model objective and scope of the claimed protection, it may also be made that a lot of form, within these belong to protection of the present utility model.
Claims (5)
1. a hydrogen gas sensor, it is characterized in that, including sensor housing (11), it is respectively provided at first contact pin (111) of described sensor housing (11) bottom, second contact pin (112) and the 3rd contact pin (113) and be sequentially arranged at described sensor housing (11) internal for the hydrogen in environment is converted to the signal of telecommunication, and by described first contact pin (111), second contact pin (112) and the 3rd contact pin (113) transmit the gas detection cell (13) of the most extraneous pcb board and for the real-time oxygen supply passage (12) carrying oxygen extremely described gas detection cell (13).
Hydrogen gas sensor the most according to claim 1, it is characterized in that, described gas detection cell (13) includes working electrode (131), working electrode lead-in wire (132), to electrode (133), to contact conductor (134), reference electrode (135), reference electrode lead-in wire (136) and electrolyte (137)；
Wherein: described working electrode (131) and the described opposite sides that electrode (133), reference electrode (135) are respectively arranged on described electrolyte (137), described working electrode (131), to electrode (133), reference electrode (135) respectively by described working electrode lead-in wire (132), contact conductor (134) and described reference electrode lead-in wire (136) are connected one to one with described first contact pin (111), the second contact pin (112) and the 3rd contact pin (113) with transmitting telecommunication number extremely external world's pcb board.
Hydrogen gas sensor the most according to claim 2, it is characterised in that hydrogen inlet faced by described working electrode (131) is so that the hydrogen molecule in environment arrives described working electrode (131) generation electrochemical reaction；Described to electrode (133) and described reference electrode (135) in the face of described oxygen supply passage (12) is so that the oxygen in environment occurs electrochemical reaction described on electrode (133).
Hydrogen gas sensor the most according to claim 2, it is characterised in that described working electrode (131), the porous gas diffusive electrode the most identical with described reference electrode (135) to electrode (133).
Hydrogen gas sensor the most according to claim 2, it is characterised in that described working electrode (131), the porous gas diffusive electrode the most different to electrode (133) and described reference electrode (135).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521086628.4U CN205426841U (en) | 2015-12-23 | 2015-12-23 | Hydrogen gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521086628.4U CN205426841U (en) | 2015-12-23 | 2015-12-23 | Hydrogen gas sensor |
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| CN205426841U true CN205426841U (en) | 2016-08-03 |
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| CN201521086628.4U Active CN205426841U (en) | 2015-12-23 | 2015-12-23 | Hydrogen gas sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383155A (en) * | 2016-12-01 | 2017-02-08 | 深圳市深安旭传感技术有限公司 | New-energy vehicle hydrogen sensor with gas diffusion channel |
| CN106502286A (en) * | 2016-12-01 | 2017-03-15 | 深圳市深安旭传感技术有限公司 | A kind of hydrogen gas sensor with humidity regulation unit |
| CN106596684A (en) * | 2016-12-01 | 2017-04-26 | 深圳市深安旭传感技术有限公司 | Hydrogen sensor |
| CN106770582A (en) * | 2016-12-01 | 2017-05-31 | 深圳市深安旭传感技术有限公司 | Used in new energy vehicles hydrogen gas sensor |
| CN108254420A (en) * | 2016-12-28 | 2018-07-06 | 深圳市普晟传感技术有限公司 | A kind of hydrogen gas sensor for quickly detection low-concentration hydrogen |
| 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 |
-
2015
- 2015-12-23 CN CN201521086628.4U patent/CN205426841U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383155A (en) * | 2016-12-01 | 2017-02-08 | 深圳市深安旭传感技术有限公司 | New-energy vehicle hydrogen sensor with gas diffusion channel |
| CN106502286A (en) * | 2016-12-01 | 2017-03-15 | 深圳市深安旭传感技术有限公司 | A kind of hydrogen gas sensor with humidity regulation unit |
| CN106596684A (en) * | 2016-12-01 | 2017-04-26 | 深圳市深安旭传感技术有限公司 | Hydrogen sensor |
| CN106770582A (en) * | 2016-12-01 | 2017-05-31 | 深圳市深安旭传感技术有限公司 | Used in new energy vehicles hydrogen gas sensor |
| CN108254420A (en) * | 2016-12-28 | 2018-07-06 | 深圳市普晟传感技术有限公司 | A kind of hydrogen gas sensor for quickly detection low-concentration hydrogen |
| CN108254420B (en) * | 2016-12-28 | 2024-03-12 | 深圳市普晟传感技术有限公司 | Hydrogen sensor for rapidly detecting low-concentration hydrogen |
| 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 |
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