Samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring

Abstract

The invention provides a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, and belongs to the field of gas sensors.The potential type carbon monoxide sensor comprises a YSZ substrate, a reference electrode and a sensitive electrode, the reference electrode and the sensitive electrode are arranged on the two sides of the YSZ substrate respectively, and the sensitive electrode comprises a sensitive electrode slurry layer and a Pt metal layer; the Pt metal layer is arranged between the YSZ substrate and the sensitive electrode slurry layer; the sensitive electrode slurry layer is prepared by screen printing of sensitive electrode slurry, the sensitive electrode slurry is prepared by mixing a samarium manganate material and an adhesive, and the samarium manganate material is SmMn2O5 powder. The samarium manganate material in the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring has relatively good electrocatalytic activity and relatively high carbon monoxide response speed, sensitivity and selectivity, so that the sensor can detect the concentration of low-concentration carbon monoxide in real time, and the response of the sensor to detected gas is remarkably improved; and large-scale popularization and application are facilitated.

Description

Technical Field

[0001] This application belongs to the field of gas sensors, specifically relating to a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring. Background Technology

[0002] Carbon monoxide (CO) is an odorless, tasteless, and colorless gas. Compared to oxygen, human blood has a 250-300 times higher affinity for CO, making it extremely toxic to humans and animals. Exposure to high concentrations of CO can have adverse health effects, such as chemical asphyxiation and fatal respiratory and cardiovascular effects, even death in severe cases. Furthermore, vehicle batteries are highly susceptible to fire hazards after collisions, as collisions can damage their mechanical structure, cause short circuits, and lead to overheating. Real-time monitoring of the CO concentration inside the battery and providing early warning of thermal runaway can effectively improve the safety of electric vehicles. This requires sensors with high sensitivity and the ability to quickly detect CO concentration.

[0003] Currently, most CO sensors are resistive sensors based on semiconductor materials. However, resistive sensors are susceptible to changes in temperature, humidity, and airflow, have poor resistance to cross-interference, and suffer from high false alarm rates. In contrast, potential sensors offer advantages such as high stability at high temperatures, strong corrosion resistance, high sensitivity, and fast response speed, making them suitable for real-time CO concentration detection. Electrochemical CO sensors mainly consist of three parts: an electrolyte, a reference electrode, and a sensitive electrode. The solid electrolyte plays a role in charge carrier conduction, and years of commercial application have proven that yttrium-stabilized zirconia (YSZ) is an electrolyte with excellent high-temperature performance. The reference electrode mainly uses materials with low catalytic activity towards the target gas and good thermal stability, such as the noble metal Pt. As a key functional component, the sensitive electrode should possess excellent adsorption, electrochemical recognition, and energy conversion capabilities for the target gas. However, existing sensitive electrodes have relatively low response speeds for low-concentration CO, making it difficult to accurately detect CO concentration under low-concentration CO conditions.

[0004] Therefore, selecting suitable sensitive electrode materials to improve the response speed to low concentrations of CO is the key to breaking through existing technologies, and a solution is urgently needed to address the aforementioned shortcomings of existing technologies. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, which aims to solve the problem that the existing CO sensors have a low response speed to low concentration CO and are difficult to accurately detect CO concentration under low concentration CO conditions.

[0006] In a first aspect, embodiments of this application provide a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, comprising a YSZ substrate, a reference electrode, and a sensitive electrode. The reference electrode and the sensitive electrode are respectively disposed on both sides of the YSZ substrate. The sensitive electrode comprises a sensitive electrode paste layer and a Pt metal layer, with the Pt metal layer disposed between the YSZ substrate and the sensitive electrode paste layer. The sensitive electrode paste layer is obtained by screen printing of sensitive electrode paste, which is prepared by mixing samarium manganate material and a binder. The samarium manganate material is SmMn2O5 powder with a particle size of 40–80 μm.

[0007] In some embodiments, the preparation method of samarium manganate material includes the following steps: S1, at 80~100 ℃, Sm(NO3)3·6H2O and Mn(CH3COO)2·4H2O are successively dispersed in deionized water to obtain a mixed solution; S2, add citric acid monohydrate and ethylene glycol to the mixture, stir continuously until gel appears, dry the gel at 100 °C for 600 min, and then cool naturally to obtain a solid. S3, the solid material is subjected to calcination at 200~300 ℃ and annealing at 800~1000 ℃ in sequence, and then ground into powder to obtain samarium manganate material.

[0008] In some embodiments, in step S1, the molar ratio of Sm(NO3)3·6H2O to Mn(CH3COO)2·4H2O is 28.1:71.9 ~ 36.7:63.3, and the ratio of Sm(NO3)3·6H2O to deionized water is 0.009 mol : 41 mL ~ 0.011 mol : 39 mL.

[0009] In some embodiments, in step S2, the mass ratio of citric acid monohydrate to ethylene glycol is 59.57:40.43 ~ 59.26:40.74; and the molar ratio of citric acid monohydrate to Sm(NO3)3·6H2O in step S1 is 83.02:16.98 ~ 80.70:19.30.

[0010] In some embodiments, step S3 specifically includes: calcining the solid at 200-300 °C for 200-300 min until the organic matter is completely decomposed; the annealing step specifically includes: annealing the calcined solid at 800-1000 °C for 160-200 min.

[0011] In some embodiments, the YSZ substrate is a 5% mol-doped Y2O3-ZrO2 solid electrolyte material; the reference electrode material includes at least one of Pt, Au, and Ag; in the sensitive electrode slurry, the mass ratio of samarium manganate material to binder is 6.8:3.2 to 7.2:2.8; the binder is prepared by mixing terpineol, ethyl cellulose, and Span 80 in a mass ratio of 93:5:2 to 95:4:1.

[0012] In some embodiments, the Pt metal layer includes a first region and a second region, the first region being covered and bonded by a sensitive electrode paste layer, and the second region being connected to an Ag wire.

[0013] Secondly, embodiments of this application provide a method for preparing a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring. This method is used to prepare the potential-type carbon monoxide sensor described in the first aspect above, and includes the following steps: screen printing a reference electrode on one side of a YSZ substrate, sintering it at 1000~1400 °C for 100~140 min, and naturally cooling it to room temperature; screen printing a Pt metal layer on the other side of the YSZ substrate, mixing samarium manganate material and a binder to prepare a sensitive electrode paste and coating it onto the Pt metal layer, baking it at 100~200 °C for 30~90 min, and then sintering it at 800~1100 °C, and naturally cooling it to room temperature after sintering; connecting the sensitive electrode and the reference electrode respectively with silver paste dipped in silver wire, and baking them at 100~200 °C for 100~140 min to obtain the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring.

[0014] Compared with the prior art, the beneficial effects of this application include: 1. The potential-type carbon monoxide sensor provided in this application uses samarium manganate as the sensitive electrode and exhibits a rapid response to CO. At 400 °C, the response time and recovery time for 80 ppm CO can both reach 20 s, and it has a high response value (-24.69 mV) and sensitivity (-19.21 mV / dec). At the same time, combined with YSZ solid electrolyte, which has high temperature resistance, strong mechanical stability and strong ionic conductivity, the prepared sensor still has high sensitivity and response speed for low concentrations of CO gas.

[0015] 2. The samarium manganate sensitive electrode material in the potential-type carbon monoxide sensor provided in this application has a simple preparation process, low cost, and high yield, which is conducive to large-scale promotion and application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0017] Figure 1 Here are schematic diagrams of one embodiment of the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to this application: a is a schematic diagram of the front structure of the YSZ substrate, and b is a schematic diagram of the back structure of the YSZ substrate. Figure 2 The image shows the XRD pattern of the samarium manganate material prepared in Example 1 of this application. Figure 3 The graph shows the response characteristics of the samarium manganate-based carbon monoxide sensor prepared in Example 1 of this application to different concentrations of CO at different temperatures. Figure 4 This is a comparison chart of the response values ​​of the samarium manganate-based carbon monoxide sensor prepared in Example 1 of this application for carbon emission reduction and safety monitoring to different gases (including CO, CO2, CH4, and NH3) at a concentration of 80 ppm. Figure 1 In the middle: 1-YSZ substrate, 2-reference electrode, 3-sensitive electrode, 31-sensitive electrode paste layer, 32-Pt metal layer, 4-first Ag point, 5-first Ag wire, 6-second Ag point, 7-second Ag wire. Detailed Implementation

[0018] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the existing technology, some CO sensors are resistive sensors based on semiconductor materials. However, resistive sensors are easily affected by temperature, humidity, airflow, etc., have poor anti-interference ability, and have a high false alarm rate. At the same time, existing potential sensors do not have a good design method to accurately detect CO concentration under low CO conditions.

[0022] To address the aforementioned problems, in a first aspect, embodiments of this application provide a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, comprising a YSZ substrate, a reference electrode, and a sensitive electrode. The reference electrode and the sensitive electrode are respectively disposed on both sides of the YSZ substrate. The sensitive electrode comprises a sensitive electrode paste layer and a Pt metal layer, with the Pt metal layer disposed between the YSZ substrate and the sensitive electrode paste layer. The sensitive electrode paste layer is obtained by screen printing of sensitive electrode paste, which is prepared by mixing samarium manganate material and a binder. The samarium manganate material is SmMn2O5 powder with a particle size of 40–80 μm.

[0023] Specifically, please refer to Figure 1 The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring consists of a YSZ substrate 1, a reference electrode 2, a sensitive electrode 3, a first Ag point 4, a first Ag wire 5, a second Ag point 6, and a second Ag wire 7. The sensitive electrode 3 is composed of an upper sensitive electrode paste layer 31 and a lower Pt metal layer 32. The Pt metal layer 32 includes a first region (…). Figure 1 (b) the dashed area) and the second area ( Figure 1 (The solid line area in b) The first region is covered and bonded by the sensitive electrode paste layer, while the second region is not covered by the sensitive electrode paste layer 31 and is used to connect with the first Ag wire 5. Overall, the sensitive electrode 3 and the reference electrode 2 are symmetrically distributed on both sides of the YSZ substrate 1. The first Ag wire 5 and the second Ag wire 7 are fixed to the sensitive electrode 3 and the reference electrode 1 respectively by the first Ag point 4 and the second Ag point 6.

[0024] In this application, samarium manganate material is used as the core raw material for the sensitive electrode paste. Its mechanism of action and advantages are as follows: SmMn2O5 samarium manganate is a p-type semiconductor with a single electron occupying an orbital near the Fermi level in the dz2 state. This results in a low sensing reaction barrier and promotes the oxidation reaction of gas molecules on its surface. Consequently, the prepared samarium manganate material exhibits a mullite-type metal oxide with a special structure and excellent properties, possessing a large number of oxygen vacancies and excellent catalytic performance. It is precisely because of these superior structural characteristics that samarium manganate, as a gas sensor, exhibits rapid response characteristics and can serve as the sensitive electrode for CO sensors, significantly improving the sensitivity of CO gas detection and accurately detecting CO concentration even under low-concentration CO conditions.

[0025] In some embodiments, the preparation method of samarium manganate material in this application includes the following steps: S1, at 80~100 °C, Sm(NO3)3·6H2O and Mn(CH3COO)2·4H2O are sequentially dispersed in deionized water to obtain a mixed solution. In this step, the molar ratio of Sm(NO3)3·6H2O to Mn(CH3COO)2·4H2O is 28.1:71.9 ~ 36.7:63.3, and the ratio of Sm(NO3)3·6H2O to deionized water is 0.009 mol : 41 mL ~ 0.011 mol : 39 mL. In this step, the above raw materials can be dispersed by magnetic stirring. In other embodiments, other dispersion methods can also be used according to the actual situation, and are not limited here. In this step, the reaction temperature of the above raw materials can be maintained by water bath heating. In other embodiments, other methods for maintaining the reaction temperature can also be used according to the actual situation, and are not limited here.

[0026] In step S2, citric acid monohydrate and ethylene glycol are added to the mixture and stirred continuously until a gel forms. The gel is then dried at 100 °C for 600 min, followed by natural cooling to obtain a solid. In this step, the mass ratio of citric acid monohydrate to ethylene glycol is 59.57:40.43 ~ 59.26:40.74; the molar ratio of citric acid monohydrate to Sm(NO3)3·6H2O from step S1 is 83.02:16.98 ~ 80.70:19.30. This step requires continuous stirring in a water bath to prevent complete evaporation of the deionized water. Heating is stopped when a gel forms in the beaker. A forced-air drying oven can be used for this step. In other embodiments, other drying methods may be used depending on the actual situation, and are not limited here.

[0027] S3, the solid material is sequentially calcined at 200-300 °C and annealed at 800-1000 °C, then ground into powder to obtain samarium manganate material. In this step, the solid material is first calcined at 200-300 °C for 200-300 min until the organic matter is completely decomposed, and then the calcined solid material is annealed at 800-1000 °C for 160-200 min. In this step, an agate mortar and pestle can be used for grinding. In other embodiments, other methods can be used for grinding depending on the actual situation, and are not limited here.

[0028] In some embodiments, the YSZ substrate is yttrium-stabilized zirconium oxide, which is a 5% mol doped Y2O3-ZrO2 solid electrolyte material. A 50 μm thick YSZ film can be obtained using a casting machine. Eight films are then stacked into a single substrate using an isostatic press. The number and thickness of the YSZ films can be adjusted according to actual needs and are not limited here.

[0029] In some embodiments, the reference electrode material includes at least one of Pt, Au, and Ag; in the sensitive electrode slurry, the mass ratio of samarium manganate material to binder is 6.8:3.2 to 7.2:2.8; the binder is prepared by mixing terpineol, ethyl cellulose, and Span 80 in a mass ratio of 93:5:2 to 95:4:1.

[0030] In some embodiments, the Pt metal layer includes a first region and a second region, the first region being covered and bonded to a sensitive electrode, and the second region being connected to an Ag wire.

[0031] Secondly, embodiments of this application provide a method for preparing a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring. This method, used to prepare the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring described in the first aspect, includes the following steps: 1) Preparation of reference electrode: A Pt reference electrode was screen-printed on one side of the YSZ substrate, sintered at 1000~1400 ℃ for 100~140 min, and then naturally cooled to room temperature.

[0032] 2) Preparation of samarium manganate sensitive electrode: A Pt metal layer is screen printed on the other side of the YSZ substrate. The samarium manganate material and the binder are mixed according to the above formula ratio to prepare the sensitive electrode paste and coated on the Pt metal layer. The paste is baked at 100~200 ℃ for 30~90 min and then sintered at 800~1100 ℃. After sintering, the paste is naturally cooled to room temperature.

[0033] 3) Sintering and molding of the sensor: Dip the end of the silver wire in a small amount of silver paste and connect it to the sensitive electrode and the reference electrode respectively. Place it in a drying oven at 100~200 ℃ for 100~140 min to make the silver wire and YSZ bond tightly together, and obtain a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring.

[0034] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0035] I. Preparation Method Example

[0036] The specific preparation steps of the samarium manganate material in Example 1 are as follows: Pour 80 mL of deionized water into a beaker and heat in a water bath at 80 °C with magnetic stirring. First, weigh 0.02 mol of Sm(NO3)3·6H2O using an analytical balance and add it to the deionized water, stirring magnetically until completely dissolved. Then, weigh 0.04 mol of Mn(AC)2·4H2O using an analytical balance and add it to the above solution, stirring magnetically until the solution becomes clear. Finally, weigh 0.09 mol of citric acid monohydrate and 0.2 / 3 the mass of citric acid into the beaker, respectively, and add them sequentially, stirring thoroughly. Continue stirring in the water bath while preventing complete evaporation of the deionized water. Stop heating when a gel forms in the beaker. Then, place the gel product in the beaker into a forced-air drying oven and dry at 100 °C for 600 min. After cooling, transfer the product to a crucible using a spatula. The powder was then placed in a high-temperature calcination furnace and calcined at 300 °C for 240 min to remove organic matter, followed by annealing at 900 °C for 180 min. Finally, the calcined SmMn2O5 powder was continuously and thoroughly ground in an agate mortar until it became a uniform and fine powder with a particle size of 40–80 μm. Grinding was then stopped, and the powder was transferred to a dry container and sealed for storage for later use.

[0037] The specific preparation steps of the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring in Example 1 are as follows: (1) Preparation of reference electrode: Pt paste was screen-printed onto the front side of a YSZ substrate with a side length of 9 mm and a thickness of 0.35 mm. The YSZ substrate with the reference electrode was placed in a high-temperature furnace and heated to 1200 ℃ at a rate of 2 ℃ / min and held for 120 min. Finally, it was naturally cooled to room temperature in the high-temperature furnace to obtain a reference electrode with a side length of 3 mm.

[0038] (2) Preparation of the sensitive electrode: First, a Pt metal layer is printed on the reverse side of the YSZ substrate near the edge using the method in step (1), and then calcined in a high-temperature furnace and naturally cooled. Take 7 g of samarium manganate powder and 3 g of organic binder (containing 94 wt.% terpineol, 5 wt.% ethyl cellulose, and 1 wt.% Span 80), mix them evenly, and prepare a sensitive electrode paste. Screen print the sensitive electrode paste onto the reverse side of the YSZ substrate, covering most of the Pt metal layer (the size of the samarium manganate printing paste is 6 mm × 6 mm), leaving a small portion of the Pt metal layer to connect the Ag wire. Place the YSZ substrate with the sensitive electrode printed in a drying oven and dry it at 150 ℃ for 120 min; then heat the YSZ substrate with the reference electrode and the sensitive electrode printed to 800~1100 ℃ at a rate of 2 ℃ / min and sinter it, and then naturally cool it to room temperature in a high-temperature furnace.

[0039] (3) Sensor fabrication: One end of an Ag wire with a diameter of 0.2 mm was dipped in a small amount of Ag paste and placed on the surface of the Pt metal layer left on the sensitive electrode side, and dried at 150 °C for 120 min. Similarly, a silver wire was connected to the surface of the reference electrode to complete the fabrication of a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring.

[0040] II. Testing Methods (1) Characterization of samarium manganate materials The samarium manganate material prepared in the above examples was characterized by XRD.

[0041] (2) Sensor performance test for detecting low concentration CO This test aims to verify the detection performance of the sensor prepared in this application for low concentrations of CO. The specific test steps are as follows: (1) After the sensor is heated to the working temperature, the base gas (containing 10% oxygen and 90% nitrogen) is introduced into the quartz tube. When the sensor signal (i.e. the potential difference between the sensitive and reference electrodes) reaches stability, the sensor signal value Vbase in the base gas is obtained.

[0042] (2) Different concentrations of CO (including 80 ppm, 40 ppm, 20 ppm, and 10 ppm) were introduced into the quartz tube. When the signal stabilized, the sensor signal value VtCO was obtained, where t = 80, 40, 20, and 10.

[0043] (3) The base gas (containing 10% oxygen and 90% nitrogen) is reintroduced into the quartz tube. When the sensor signal recovers to the base gas (containing 10% oxygen and 90% nitrogen) signal value Vbase, the sensor completes one response and recovery process. The signal difference ΔV (ΔV = VtCO - Vbase) between CO and the base gas is the sensor's response value for that concentration of CO.

[0044] III. Test Results and Analysis I. Figure 2 The image shows the XRD pattern of the samarium manganate sensitive electrode material prepared by the sol-gel method in Example 1. It can be clearly seen that the diffraction peaks of SmMn2O5 prepared by the method of this application correspond well with the standard PDF (52-1012) card, and there are no changes in other impurities and substances. Therefore, it can be inferred that the prepared powder is a pure phase of SmMn2O5.

[0045] II. Figure 3 The graphs show the response characteristics of a samarium manganate-based sensor to different CO concentrations at operating temperatures ranging from 350 to 425 °C. The horizontal axis represents time, and the vertical axis represents the response value. It can be seen that at an operating temperature of 400 °C, the sensor exhibits a relatively large response to different CO concentrations, with short response and recovery times. It shows a response value of -24.69 mV for 80 ppm CO, with both response and recovery times of 20 s. It also achieves a response value of -10.51 mV for 10 ppm CO, indicating that the sensor has the capability for real-time detection of low-concentration CO.

[0046] III. Figure 4 The graph shows the response values ​​of a samarium manganate sensing electrode sintered at 900 °C to different gases (including CO, CO2, CH4, and NH3) at a concentration of 80 ppm. The horizontal axis represents the detected gas, and the vertical axis represents the response value for each gas. The operating temperature is 400 °C. The sensor's response to CO is 10 times that of CO2, 5 times that of CH4, and 2 times that of NH3. This indicates that the sensor prepared in Example 1 of this application exhibits excellent CO selectivity and low cross-sensitivity to other gases, with less interference from other gases in its CO response.

[0047] In summary, compared with the prior art, the samarium manganate material described in this application has better electrocatalytic activity and higher carbon monoxide response speed, sensitivity and selectivity; the samarium manganate-based carbon monoxide sensor described in this application for carbon emission reduction and safety monitoring can detect low concentrations of carbon monoxide in real time, further improving the sensor's response to the detected gas.

[0048] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, characterized in that, It includes a YSZ substrate, a reference electrode, and a sensitive electrode. The reference electrode and the sensitive electrode are respectively disposed on both sides of the YSZ substrate. The sensitive electrode includes a sensitive electrode paste layer and a Pt metal layer. The Pt metal layer is disposed between the YSZ substrate and the sensitive electrode paste layer. The sensitive electrode paste layer is obtained by screen printing of the sensitive electrode paste. The sensitive electrode paste is obtained by mixing samarium manganate material and binder. The samarium manganate material is SmMn2O5 powder with a particle size of 40-80 μm.

2. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 1, characterized in that, The preparation method of the samarium manganate material includes the following steps: S1, at 80~100 ℃, Sm(NO3)3·6H2O and Mn(CH3COO)2·4H2O are successively dispersed in deionized water to obtain a mixed solution; S2, add citric acid monohydrate and ethylene glycol to the mixture, stir continuously until gel appears, dry the gel at 100 °C for 600 min, and then cool naturally to obtain a solid. S3, the solid material is subjected to calcination at 200~300 ℃ and annealing at 800~1000 ℃ in sequence, and then ground into powder to obtain the samarium manganate material.

3. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 2, characterized in that, In step S1, the molar ratio of Sm(NO3)3·6H2O to Mn(CH3COO)2·4H2O is 28.1:71.9 ~ 36.7:63.3, and the ratio of Sm(NO3)3·6H2O to deionized water is 0.009 mol : 41 mL ~ 0.011 mol : 39 mL.

4. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 2, characterized in that, In step S2, the mass ratio of citric acid monohydrate to ethylene glycol is 59.57:40.43 ~ 59.26:40.74; The molar ratio of the monohydrated citric acid to Sm(NO3)3·6H2O in step S1 is 83.02:16.98 ~ 80.70:19.

30.

5. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 2, characterized in that, In step S3, the calcination treatment specifically includes: calcining the solid at 200~300 ℃ for 200~300 min until the organic matter is completely decomposed; The annealing process specifically includes annealing the solid material after calcination at 800-1000 °C for 160-200 min.

6. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 1, characterized in that, The YSZ substrate is a 5% mol-doped Y2O3-ZrO2 solid electrolyte material; The material of the reference electrode includes at least one of Pt, Au, and Ag; In the sensitive electrode slurry, the mass ratio of samarium manganate material to binder is 6.8:3.2 to 7.2:2.8; The adhesive is prepared by mixing terpineol, ethyl cellulose and Span 80 in a mass ratio of 93:5:2 to 95:4:

1.

7. The samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring according to claim 1, characterized in that, The Pt metal layer includes a first region and a second region. The first region is covered and bonded by the sensitive electrode paste layer, and the second region is connected to the Ag wire.

8. A method for preparing a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring as described in any one of claims 1 to 7, characterized in that, Includes the following steps: A reference electrode was screen-printed on one side of the YSZ substrate and sintered at 1000~1400 ℃ for 100~140 min, then naturally cooled to room temperature. A Pt metal layer is screen-printed on the other side of the YSZ substrate. A sensitive electrode paste is prepared by mixing samarium manganate material and adhesive and coated onto the Pt metal layer. The paste is baked at 100~200 ℃ for 30~90 min and then sintered at 800~1100 ℃. After sintering, the paste is naturally cooled to room temperature. The ends of silver wires are dipped in silver paste and connected to the sensitive electrode and the reference electrode respectively. The electrodes are then baked at 100-200 °C for 100-140 min to obtain the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring.

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