CN211348032U - Electrochemical gas sensor - Google Patents
Electrochemical gas sensor Download PDFInfo
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- CN211348032U CN211348032U CN201921962810.XU CN201921962810U CN211348032U CN 211348032 U CN211348032 U CN 211348032U CN 201921962810 U CN201921962810 U CN 201921962810U CN 211348032 U CN211348032 U CN 211348032U
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- electrochemical gas
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Abstract
The utility model provides an electrochemical gas sensor, which comprises a base with an opening at the top and an upper cover, wherein a liquid storage device, a counter electrode, a liquid guiding device and a working electrode are sequentially filled in a cavity in the base from bottom to top; electrolyte is adsorbed in the liquid storage device and the liquid guide device, and the liquid storage device and the liquid guide device are both made of silicate glass fiber sheets or borosilicate glass fiber sheets; the liquid storage device, the counter electrode, the liquid guide device and the working electrode form a solid component, the electrolyte forms a liquid component, and a cavity in the base has a gas cavity besides the solid component and the liquid component; the ratio of the volume of the solid member, the volume of the liquid member, and the volume of the gas cavity is 531: 410: 1150. the device can shorten the response time of the sensor and has a simple structure.
Description
Technical Field
The utility model relates to a check out test set field, specific theory has related to an electrochemistry gas sensor.
Background
The electrochemical gas sensor is an important class of gas sensors and is mainly applied to the field of detection of toxic and harmful gases in petroleum, natural gas, mining, chemical engineering and the like. The electrochemical gas sensor mainly comprises a working electrode, a separator, a reference electrode, a counter electrode, a liquid storage tank, an electrolyte and the like. Electrochemical sensors typically include a detection electrode and a counter electrode on which the gas of interest can be oxidized or reduced, the detection electrode and counter electrode being separated by a porous object containing an electrolyte and further being operable to restrict the proximity of the gas to the detection electrode such that the amount of gas reaching the detection electrode is proportional to the amount of gas in the atmosphere being detected. The gas is oxidized or reduced at the detection electrode, and the resulting current fluctuates in the external circuit. The current flowing through the circuit, which is proportional to the amount of gas oxidized or reduced at the detection electrode and proportional to the amount of gas in the external atmosphere being detected, provides a direct measure of the amount of gas in the atmosphere being detected by the sensor.
The existing electrochemical gas sensor has the problems of poor stability, drift amount of more than or equal to 20%/year, long response time, usually more than 30S, complex structure, difficulty in automatic production and the like, thereby limiting the wider application of the gas sensor.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of prior art to provide an electrochemistry gas sensor.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: an electrochemical gas sensor comprises a base with an open top and an upper cover arranged at the open top of the base, wherein a plurality of air holes are formed in the upper cover, and a liquid storage device, a counter electrode, a liquid guide device and a working electrode are sequentially filled in a cavity in the base from bottom to top; electrolyte is absorbed in the liquid storage device and the liquid guide device,
the liquid storage device is a winding structure formed by winding a silicate glass fiber sheet or a borosilicate glass fiber sheet with the aperture being more than or equal to 10 mu m, and the liquid guide device is a sheet structure made of the silicate glass fiber sheet or the borosilicate glass fiber sheet with the aperture being less than or equal to 10 mu m;
the liquid storage device, the counter electrode, the liquid guide device and the working electrode form a solid component, the electrolyte forms a liquid component, and a cavity in the base has a gas cavity besides the solid component and the liquid component; the ratio of the volume of the solid member, the volume of the liquid member, and the volume of the gas cavity is 531: 410: 1150.
based on the above, the counter electrode and the working electrode are respectively arranged on a polytetrafluoroethylene lining plate.
Based on the above, the electrochemical gas sensor further comprises a reference electrode, and the reference electrode and the counter electrode are arranged on the same polytetrafluoroethylene lining plate.
Based on the above, the ratio of the effective area of the working electrode to the effective area of the counter electrode is 1: (1-3).
Based on the above, the ratio of the effective area of the working electrode to the effective area of the counter electrode is 1: 2.
based on the above, under the same area condition, the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode is (1-2): 1.
based on the above, under the same area condition, the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode is 1.8: 1.
based on the above, the bottom of the base is further provided with a pin, and the tube corner is communicated with the counter electrode, the reference electrode and the reference electrode through leads.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses lead to and store electrolyte in functional area and stock solution district, can realize two-way transmission through capillary phenomenon, avoided the violent change of the sensor performance that the ambient humidity change arouses. Meanwhile, the response time of the sensor is shortened by optimizing the duty ratio of solid, liquid and gas in the cavity of the electrochemical sensor and optimizing the matching relation of electrodes. Furthermore, through the structural layout, the number of the parts of the electrochemical sensor which is usually more than 11 can be reduced to less than 8, and the structure is simple.
Drawings
Fig. 1 is a schematic view of a specific structure of an electrochemical gas sensor provided in embodiment 1 of the present invention.
Fig. 2 is a schematic view of a specific structure of an electrochemical gas sensor provided in embodiment 2 of the present invention.
Fig. 3 is a performance test chart of the electrochemical gas sensor provided by the present invention.
In the figure: 1. a base; 2. a liquid storage device; 3. a counter electrode; 4. a drainage device; 5. a working electrode; 6. an upper cover; 7. air holes; 8. a reference electrode; 9. a pin.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
Example 1
The utility model provides an electrochemical gas sensor, as shown in figure 1, it includes open-topped base 1 and sets up the upper cover 6 of the open department of base 1. The upper cover 6 is provided with a plurality of air holes 7. A liquid storage device 2, a counter electrode 3, a liquid guiding device 4 and a working electrode 5 are sequentially filled in a cavity in the base 1 from bottom to top; electrolyte is adsorbed in the liquid storage device 2 and the liquid guide device 4.
The liquid storage device 2 is a winding structure formed by winding a silicate glass fiber sheet with the aperture being more than or equal to 10 mu m, and the liquid guide device 4 is a sheet-shaped structure formed by a borosilicate glass fiber sheet with the aperture being less than or equal to 10 mu m.
The liquid storage device 2, the counter electrode 3, the liquid guide device 4 and the working electrode 5 form a solid component, the electrolyte forms a liquid component, and a gas cavity is formed in a cavity in the base besides the solid component and the liquid component; the ratio of the volume of the solid member, the volume of the liquid member, and the volume of the gas cavity is 531: 410: 1150.
wherein, the counter electrode 3 and the working electrode 5 are respectively arranged on a polytetrafluoroethylene lining plate.
The electrochemical gas sensor also comprises a reference electrode 8, wherein the reference electrode 8 and the counter electrode 3 are arranged on the same polytetrafluoroethylene lining plate.
The ratio of the effective area of the working electrode to the effective area of the counter electrode is 1: (1-3).
Under the same area condition, the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode is (1-2): 1.
based on the above, under the same area condition, the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode is 1.8: 1.
the bottom of the base is also provided with a pin, and the tube corner is communicated with the counter electrode, the reference electrode and the reference electrode through leads.
Example 2
The utility model provides an electrochemical gas sensor, as shown in figure 2, its structure is roughly the same with the structure in embodiment 1, the difference lies in, this electrochemical gas sensor does not include the reference electrode, is the two electrode system that comprises working electrode, counter electrode.
Performance testing
The sensitivity and the corresponding time of the electrochemical gas sensor provided by embodiment 1 and embodiment 2 are respectively tested, and the result is as shown in fig. 3, and can be seen from the figure, the utility model provides an electrochemical gas sensor corresponding time can reach and is less than 15S, is far less than the corresponding time that is greater than 30S of ordinary electrochemical gas sensor, simultaneously, the utility model provides an among the electrochemical gas sensor resistance of gas-sensitive element in the air and the resistance ratio in the atmosphere of detecting can reach 500, illustrate that its sensitivity is higher.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (8)
1. An electrochemical gas sensor comprises a base with an open top and an upper cover arranged at the open top of the base, wherein the upper cover is provided with a plurality of air holes, and is characterized in that a cavity in the base is sequentially filled with a liquid storage device, a counter electrode, a liquid guide device and a working electrode from bottom to top; electrolyte is absorbed in the liquid storage device and the liquid guide device,
the liquid storage device is a winding structure formed by winding a silicate glass fiber sheet or a borosilicate glass fiber sheet with the aperture being more than or equal to 10 mu m, and the liquid guide device is a sheet structure made of the silicate glass fiber sheet or the borosilicate glass fiber sheet with the aperture being less than or equal to 10 mu m;
the liquid storage device, the counter electrode, the liquid guide device and the working electrode form a solid component, the electrolyte forms a liquid component, and a cavity in the base has a gas cavity besides the solid component and the liquid component; the ratio of the volume of the solid member, the volume of the liquid member, and the volume of the gas cavity is 531: 410: 1150.
2. the electrochemical gas sensor according to claim 1, wherein the counter electrode and the working electrode are each disposed on a teflon backing plate.
3. The electrochemical gas sensor according to claim 2, further comprising a reference electrode disposed on the same teflon backing plate as the counter electrode.
4. An electrochemical gas sensor according to claim 3, wherein the ratio of the active area of the working electrode to the active area of the counter electrode is 1: (1-3).
5. The electrochemical gas sensor according to claim 4, wherein the ratio of the effective area of the working electrode to the effective area of the counter electrode is 1: 2.
6. an electrochemical gas sensor according to claim 5, wherein the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode under the same area condition is (1-2): 1.
7. the electrochemical gas sensor according to claim 6, wherein the ratio of the sheet resistance of the working electrode to the sheet resistance of the counter electrode is 1.8: 1.
8. the electrochemical gas sensor according to claim 7, wherein the bottom of the base is further provided with pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962810.XU CN211348032U (en) | 2019-11-14 | 2019-11-14 | Electrochemical gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962810.XU CN211348032U (en) | 2019-11-14 | 2019-11-14 | Electrochemical gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211348032U true CN211348032U (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921962810.XU Active CN211348032U (en) | 2019-11-14 | 2019-11-14 | Electrochemical gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211348032U (en) |
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2019
- 2019-11-14 CN CN201921962810.XU patent/CN211348032U/en active Active
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