阅读说明：本技术 电化学气体传感器 (Electrochemical gas sensor ) 是由 张小水 古瑞琴 雷同贵 刘红霞 钟克创 高胜国 于 2019-11-14 设计创作，主要内容包括：本发明提供一种电化学气体传感器,它包括顶部敞口的底座和上盖,所述底座内部型腔内自下而上依次填充有储液装置、对电极、导液装置、工作电极；所述储液装置和所述导液装置内吸附有电解液,所述储液装置和所述导液装置均由硅酸盐玻璃纤维片或硼硅酸盐玻璃纤维片制成；所述储液装置、所述对电极、所述导液装置与所述工作电极组成固体构件,所述电解液构成液体构件,所述底座内部型腔除所述固体构件和所述液体构件之外还存在气体空腔；所述固体构件的体积、所述液体构件的体积、所述气体构件的体积之比为531：410：1150。该装置缩短了传感器的响应时间且结构简单。(The invention provides an electrochemical gas sensor which comprises a base with an open top and an upper cover, wherein 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 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 member is 531: 410: 1150. the device shortens the response time of the sensor and has a simple structure.)

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 member 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.

Technical Field

The invention relates to the field of detection equipment, in particular to an electrochemical 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.

Disclosure of Invention

It is an object of the present invention to address the deficiencies of the prior art and thereby provide an electrochemical gas sensor.

In order to achieve the purpose, the invention adopts the technical scheme that: 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 member 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.

Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the invention can realize bidirectional transmission through capillary phenomenon by storing the electrolyte in the functional area and the liquid storage area, thereby avoiding the drastic change of the sensor performance caused by the change of the environmental humidity. 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 structural diagram of an electrochemical gas sensor provided in embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram 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 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 is further described in detail by the following embodiments.