Electrochemical gas sensor array

Abstract

The utility model belongs to the field of sensors, and relates to an electrochemical gas sensor array, which comprises a plurality of sub-sensors, a gas sensor array and a gas sensor array, the counter electrode comprises a counter electrode base material, a counter electrode catalyst, a counter electrode conductive strip, a counter electrode external connecting hole, a fool-proof column and a counter electrode electrolyte, the counter electrode catalyst, the counter electrode conductive strip, the fool-proof column and the counter electrode electrolyte are all arranged on the counter electrode base material, and the counter electrode external connecting hole is formed in the counter electrode conductive strip; the working electrode comprises a working electrode base material, a working electrode catalyst, a working electrode conductive strip, a working electrode external connecting hole, a working electrode fool-proof hole and a working electrode electrolyte; and the fool-proof column is matched with the working electrode fool-proof hole. The device is high in integration and modularization degree, high in gas detection capability, high in conductivity and connection reliability, easy to maintain and upgrade and capable of being universally applied to the fields of environmental monitoring, industrial safety, medical health and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor array technical field more specifically, relate to a kind of electrochemical gas sensor array. BACKGROUND

[0002] With the development of the times, the Internet of Things is more and more affecting people's lives, and the Internet of Things uses various principle sensors as the sensing layer to obtain bottom layer information. The indicators detected by these sensors can be physical quantities or chemical quantities. As the eyes and antennae of the Internet of Things, they provide basic data for the Internet of Things. The Internet of Things has been increasingly applied in various levels of production and life, such as various factories, mining, hospitals, schools and other densely populated places. The content of toxic and harmful gases in these places is closely related to people's life and property. Through the centralized monitoring of the Internet of Things and big data, a good early warning effect can be achieved. Among various gas sensors, gas sensors based on electrochemical principle are widely used due to their rapid response, cost-effective, high detection accuracy and other advantages. Gas sensors based on electrochemical principle usually include a shell, a waterproof and breathable membrane, a wire, an electrode and an electrolyte. The shell provides support for the entire gas sensor and contains the electrolyte, electrode and reaction gas chamber inside. The waterproof and breathable membrane ensures that the reaction gas and water vapor can enter and exit the sensor interior, but liquid water cannot enter. The waterproof and breathable membrane is usually attached to the shell by double-sided tape. The wire, usually made of corrosion-resistant materials such as Pt and Au, is used to transmit the chemical reaction signal. The electrode is the site of chemical reaction, and different electrodes need to be designed for different detection gases to achieve selective detection of gases. The electrolyte acts as a proton conducting medium, ensuring the closed-loop nature of the chemical reaction. This traditional form of electrochemical sensor has the problems of large size, high space requirement, and easy breakage of platinum wire and other wires used as leads, leading to poor contact and other reliability issues. SUMMARY

[0003] To overcome the above-mentioned defects of the prior art, the utility model provides an electrochemical gas sensor array, comprising:

[0004] a plurality of sub-sensors, the sub-sensors including a counter electrode and a working electrode;

[0005] The counter electrode includes a counter electrode substrate, a counter electrode catalyst, a counter electrode conductive strip, a counter electrode external connection hole, a foolproof column and a counter electrode electrolyte. The counter electrode catalyst, the counter electrode conductive strip, the foolproof column and the counter electrode electrolyte are all provided on the counter electrode substrate. The counter electrode external connection hole is provided on the counter electrode conductive strip.

[0006] The working electrode comprises a working electrode substrate, a working electrode catalyst, a working electrode conductive strip, a working electrode external connection hole, a working electrode foolproof hole and a working electrode electrolyte, the working electrode catalyst, the working electrode conductive strip, the working electrode foolproof hole and the working electrode electrolyte are arranged on the working electrode substrate, and the working electrode external connection hole is arranged on the working electrode conductive strip.

[0007] The foolproof column and the working electrode foolproof hole are matched.

[0008] Preferably, the counter electrode substrate is provided with a hill and a honeycomb-shaped micro surface.

[0009] Preferably, the working electrode substrate is provided with a hill and a honeycomb-shaped micro surface.

[0010] Preferably, the counter electrode substrate is made of ceramic, glass ceramic or metal.

[0011] Preferably, the working electrode substrate is made of ceramic, glass ceramic or metal.

[0012] Preferably, the counter electrode catalyst is made of metal or metal oxide.

[0013] Preferably, the working electrode catalyst is made of metal or metal oxide.

[0014] Preferably, the electrode conductive strip is made of metal or alloy.

[0015] Preferably, the working electrode conductive strip is made of metal or alloy.

[0016] Preferably, the electrode electrolyte and the working electrode electrolyte are both solutions or gels made of inorganic salt or organic salt.

[0017] The electrochemical gas sensor array of the utility model has the following beneficial effects:

[0018] High degree of integration and modularization: multiple sub-sensors are integrated in the same array, each sub-sensor comprises a complete counter electrode and working electrode system, realizing miniaturization and modularization of the sensor, facilitating large-scale production and rapid deployment;

[0019] Strong gas detection capability: the catalyst and electrolyte arranged on the counter electrode and working electrode respectively optimize the electrochemical reaction process, improve the sensitivity and accuracy of gas detection, and meanwhile, the matching design of the foolproof column and the working electrode foolproof hole ensures correct alignment of the sub-sensor during assembly, avoiding performance degradation caused by misoperation;

[0020] Conductive performance and connection reliability are strong: the design of the electrode conductive strip and the working electrode conductive strip ensures stable transmission of current inside the sensor, improves the efficiency and stability of signal acquisition, and the setting of the external connection hole facilitates the connection with the external circuit, thereby enhancing the overall reliability of the system;

[0021] Easy to maintain and upgrade: the modular design makes it easy and fast to replace or upgrade individual sub-sensors, reducing maintenance costs and extending the service life of the sensor array;

[0022] It can be widely used in environmental monitoring, industrial safety, medical health and other fields. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in these drawings without creative labor. The present application will be further described below in combination with the drawings and embodiments. In the drawings:

[0024] Figure 1 is the counter electrode structure diagram of the electrochemical gas sensor array of the present application;

[0025] Figure 2 is the working electrode structure diagram of the electrochemical gas sensor array of the present application.

[0026] In the figure, 11 is a counter electrode substrate, 12 is a counter electrode catalyst, 13 is a counter electrode conductive strip, 1311 is a counter electrode external connection hole, 14 is a foolproof column, 15 is a counter electrode electrolyte, 21 is a working electrode substrate, 22 is a working electrode catalyst, 23 is a working electrode conductive strip, 2311 is a working electrode external connection hole, 24 is a working electrode foolproof hole, and 25 is a working electrode electrolyte. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] It should be noted that if the embodiments of the utility model have the direction indication (such as up, down, left, right, front, back), the direction indication is only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the direction indication also changes accordingly.

[0029] In addition, if the embodiments of the utility model have the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0030] Figure 1 It is the schematic diagram of the counter electrode structure in the utility model electrochemical gas sensor array; Figure 2 It is the schematic diagram of the working electrode structure in the utility model electrochemical gas sensor array. Please refer to Figure 1 、 Figure 2 In the electrochemical gas sensor array provided by the first embodiment of the utility model, at least includes, multiple sub-sensors, the sub-sensor includes counter electrode 1 and working electrode 2;Counter electrode 1 includes counter electrode base material 11, counter electrode catalyst 12, counter electrode conductive strip 13, counter electrode external connection hole 1311, anti-stupid column 14 and counter electrode electrolyte 15, counter electrode catalyst 12, counter electrode conductive strip 13, anti-stupid column 14 and counter electrode electrolyte 15 are all arranged on counter electrode base material 11, counter electrode external connection hole 1311 is arranged on counter electrode conductive strip 13;Working electrode 2 includes working electrode base material 21, working electrode catalyst 22, working electrode conductive strip 23, working electrode external connection hole 2311, working electrode anti-stupid hole 24 and working electrode electrolyte 25, working electrode catalyst 22, working electrode conductive strip 23, working electrode anti-stupid hole 24 and working electrode electrolyte 25 are all arranged on working electrode base material 21, working electrode external connection hole 2311 is arranged on working electrode conductive strip 23;Anti-stupid column 14 and working electrode anti-stupid hole 24 cooperate.

[0031] Electrode base material is the basic support structure of counter electrode, which provides necessary mechanical strength and stability.

[0032] In specific implementation, the counter electrode substrate 11 is provided with a micro-surface of hills and honeycombs. The use of a counter electrode substrate 11 with a micro-surface of hills and honeycombs brings many advantages. First, this micro-surface structure significantly increases the specific surface area of the electrode, providing more active sites for the adsorption and reaction of gas molecules, thereby improving the sensitivity and response speed of the sensor. Second, the presence of hills and honeycomb structures optimizes the gas diffusion path, promoting the uniform distribution and rapid penetration of the gas to be measured on the electrode surface, which helps to reduce the response time and improve the measurement accuracy. In addition, this structure can effectively prevent the accumulation of water or pollutants on the electrode surface, maintaining the long-term stability and reliability of the electrode through physical barrier action. It can be seen that the design of hills and honeycomb micro-surface on the electrode substrate not only enhances the performance of the sensor, but also prolongs the service life of the equipment, providing strong support for efficient and accurate gas detection.

[0033] In specific implementation, the counter electrode substrate 11 can be made of ceramic, glass-ceramic or metal (such as stainless steel, titanium, etc.). These materials have good mechanical strength and chemical stability, and can withstand various conditions during the electrochemical reaction process.

[0034] The catalyst is a key part of the electrochemical reaction, which reduces the activation energy required for the reaction and accelerates the oxidation or reduction reaction of gas molecules on the electrode surface. The counter electrode catalyst 12 can be made of metal (such as platinum, palladium) or metal oxide (such as tin dioxide, titanium dioxide). These materials have good catalytic activity and stability, and can exhibit good sensitivity in different gas environments.

[0035] The conductive strip is used to conduct the current on the electrode to the external circuit to realize the output and measurement of the signal. The electrode conductive strip 13 is made of metal or alloy, such as platinum, gold, silver or copper, etc. These materials have excellent electrical conductivity and chemical stability, which can ensure the smooth conduction of current.

[0036] The counter electrode connecting hole 1311 can be made of the same material as the electrode conductive strip 13 to ensure good electrical contact and conductivity.

[0037] The foolproof column 14 and the working electrode foolproof hole 24 are auxiliary structures in the assembly process of the sensor, which ensure the correct alignment and stability of the working electrode 2 and the counter electrode 1 during assembly.

[0038] The foolproof column 14 can be made of the same material as the counter electrode substrate 11 to ensure good cooperation and stability between the foolproof column 14 and the counter electrode substrate 11.

[0039] The working electrode substrate 21 is provided with a hill and honeycomb-shaped micro-surface. The working electrode substrate 21 with a hill and honeycomb-shaped micro-surface brings many advantages. First, this micro-surface structure significantly increases the specific surface area of the electrode, providing more active sites for gas molecule adsorption and reaction, thereby improving the sensitivity and response speed of the sensor. Second, the presence of hill and honeycomb structure optimizes the gas diffusion path, promotes the uniform distribution and rapid penetration of the measured gas on the electrode surface, which helps to reduce the response time and improve the measurement accuracy. In addition, this structure can effectively prevent the accumulation of water or pollutants on the electrode surface, maintaining the long-term stability and reliability of the electrode through physical barrier effect. It can be seen that the hill and honeycomb-shaped micro-surface design on the electrode substrate not only enhances the performance of the sensor, but also prolongs the service life of the equipment, providing strong support for efficient and accurate gas detection.

[0040] Similar to the working electrode, the working electrode substrate 21 provides the necessary mechanical support. The working electrode substrate 21 is made of ceramic, glass-ceramic or metal.

[0041] The working electrode catalyst is the main place for electrochemical reaction, which catalyzes the oxidation or reduction reaction of gas molecules on the surface of the working electrode. The working electrode catalyst 22 is made of metal or metal oxide.

[0042] The working electrode conductive strip conducts the current on the working electrode to the external circuit for signal output and measurement. The working electrode conductive strip 23 is made of metal or alloy.

[0043] The working electrode connection hole 2311 is connected with the working electrode conductive strip 23, realizing the connection with the external circuit.

[0044] The working electrode foolproof hole 24 is made of the same material as the working electrode substrate 21 to ensure good cooperation and stability between the working electrode foolproof hole 24 and the working electrode substrate 21.

[0045] The counter electrode electrolyte provides the necessary ion conduction environment for the electrochemical reaction, ensuring the smooth progress of the reaction. The working electrode electrolyte also provides the necessary ion conduction environment for the electrochemical reaction. The electrode electrolyte 15 and the working electrode electrolyte 25 are both solutions or gels made of inorganic or organic salts.

[0046] Take the formaldehyde sub-sensor as an example to illustrate the embodiment: in the preparation time through the etching process on the counter electrode base material 11 and the working electrode base material 21 form the hill and the honeycomb micro-surface, adopt the vacuum sputtering mode on the counter electrode base material 11 and the working electrode base material 21 generate counter electrode conductive strip 13 and working electrode conductive strip 23. Because the counter electrode base material 11 and the working electrode base material 21 surface layer has three-dimensional structure, the generated conductive strip counter electrode conductive strip 13 and working electrode conductive strip 23 also has three-dimensional structure. Through the micro-emulsion electrodeposition mode respectively on the counter electrode base material 11 and the working electrode base material 21 generate counter electrode catalyst 12 and working electrode catalyst 22. In the counter electrode base material 11 surface that has generated counter electrode catalyst 12 through the vacuum sputtering mode generates counter electrode electrolyte 15. At the same time working electrode base material 21 is provided with working electrode foolproof mouth 24, counter electrode base material 11 is provided with foolproof column 14, in the assembly time only need to insert the foolproof column 14 into the working electrode foolproof mouth 24 by aligning, and can complete the assembly by hot melt way and melt the foolproof column 14 on the working electrode base material 21. In the placement time, the working electrode catalyst 22 is oriented to the counter electrode electrolyte 15 on the counter electrode. Finally, the external connection can be realized by welding wire, welding pin and other ways on the counter electrode external connection hole 1311 and the working electrode external connection hole 2311.

[0047] The utility model provides a kind of small volume electrochemical gas sensor array, the gas sensor array can include one to multiple electrochemical principle gas sensors, can provide one to multiple gas real-time online monitoring, the electrochemical gas sensor in the array uses porous ceramic substrate and non-porous alumina plate as base material, three-dimensional microconductive strip is generated on it by vacuum sputtering etc., the conductive strip can be platinum, gold, silver, titanium, rhodium etc.

[0048] The working principle of the electrochemical gas sensor array of the utility model is:

[0049] Based on the principle of electrochemical reaction, the concentration of gas is detected by measuring the current generated by the oxidation or reduction reaction of gas molecules on the electrode surface.

[0050] (1) adsorption and diffusion of gas molecules:

[0051] When gas molecules contact the sensor surface, they are adsorbed on the electrode surface. Then, the gas molecules reach the catalyst layer of the electrode by diffusion.

[0052] (2) electrochemical reaction:

[0053] Under the action of the catalyst, gas molecules undergo oxidation or reduction reactions on the electrode surface. These reactions result in the transfer of electrons, generating an electric current.

[0054] (3) Measurement and output of current

[0055] By measuring the electric current generated on the electrode, the concentration of gas molecules can be determined. The magnitude of the current is directly proportional to the concentration of gas molecules, so the concentration of gas can be quantitatively detected by measuring the current.

[0056] (4) Coordination of multiple sub-sensors:

[0057] In an electrochemical gas sensor array, multiple sub-sensors detect different gas components. Each sub-sensor has specific sensitivity and selectivity, allowing it to distinguish between different gas components. By analyzing the output signals of multiple sub-sensors, comprehensive information about complex gas environments can be obtained.

[0058] The utility model discloses the design of the above embodiment, its beneficial effects are:

[0059] High degree of integration and modularity: multiple sub-sensors are integrated in the same array, and each sub-sensor contains a complete counter electrode and working electrode system, realizing the miniaturization and modularity of the sensor, facilitating mass production and rapid deployment;

[0060] Strong gas detection capability: catalysts and electrolytes are respectively arranged on the counter electrode and working electrode, optimizing the electrochemical reaction process, improving the sensitivity and accuracy of gas detection, and the cooperation design of the foolproof column and the working electrode foolproof hole ensures the correct alignment of the sub-sensor during assembly, avoiding performance degradation caused by misoperation;

[0061] Strong conductivity and reliable connection: the design of the counter electrode conductive strip and the working electrode conductive strip ensures stable transmission of the current inside the sensor, improving the efficiency and stability of signal acquisition, and the setting of the external connection hole facilitates the connection with the external circuit, enhancing the overall reliability of the system;

[0062] Easy to maintain and upgrade: modular design makes it easy to replace or upgrade individual sub-sensors, reducing maintenance costs and extending the service life of the sensor array;

[0063] It can be widely used in environmental monitoring, industrial safety, medical health and other fields.

[0064] The utility model is described according to specific embodiments, but those skilled in the art should understand that various changes and equivalent replacements can be carried out without departing from the scope of the utility model. In addition, in order to adapt to specific occasions of the utility model technology, the utility model can be modified in many ways without departing from the protection scope. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all embodiments falling into the protection scope of claims.

Claims

1. An electrochemical gas sensor array, characterized in that, include: Multiple sub-sensors, each sub-sensor including a counter electrode (1) and a working electrode (2); The counter electrode (1) includes a counter electrode substrate (11), a counter electrode catalyst (12), a counter electrode conductive strip (13), a counter electrode external connection hole (1311), a foolproof post (14), and a counter electrode electrolyte (15). The counter electrode catalyst (12), the counter electrode conductive strip (13), the foolproof post (14), and the counter electrode electrolyte (15) are all disposed on the counter electrode substrate (11), and the counter electrode external connection hole (1311) is disposed on the counter electrode conductive strip (13). The working electrode (2) includes a working electrode substrate (21), a working electrode catalyst (22), a working electrode conductive strip (23), a working electrode external connection hole (2311), a working electrode anti-fool hole (24), and a working electrode electrolyte (25). The working electrode catalyst (22), the working electrode conductive strip (23), the working electrode anti-fool hole (24), and the working electrode electrolyte (25) are all disposed on the working electrode substrate (21), and the working electrode external connection hole (2311) is disposed on the working electrode conductive strip (23). The anti-fool post (14) and the anti-fool hole (24) of the working electrode are matched.

2. The electrochemical gas sensor array according to claim 1, characterized in that, The counter electrode substrate (11) has hills and honeycomb-shaped micro-surfaces.

3. The electrochemical gas sensor array according to claim 1, characterized in that, The working electrode substrate (21) has hills and honeycomb-shaped micro-surfaces.

4. The electrochemical gas sensor array according to claim 1, characterized in that, The counter electrode substrate (11) is made of ceramic, glass ceramic or metal.

5. The electrochemical gas sensor array according to claim 1, characterized in that, The working electrode substrate (21) is made of ceramic, glass ceramic or metal.

6. The electrochemical gas sensor array according to claim 1, characterized in that, The counter electrode catalyst (12) is made of metal or metal oxide.

7. The electrochemical gas sensor array according to claim 1, characterized in that, The working electrode catalyst (22) is made of metal or metal oxide.

8. The electrochemical gas sensor array according to claim 1, characterized in that, The electrode conductive strip (13) is made of metal or alloy.

9. The electrochemical gas sensor array according to claim 1, characterized in that, The working electrode conductive strip (23) is made of metal or alloy.

10. The electrochemical gas sensor array according to any one of claims 1 to 9, characterized in that, Both the electrode electrolyte (15) and the working electrode electrolyte (25) are solutions or gels made of inorganic or organic salts.

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