Hydrogen gas-sensitive material, gas sensor, and preparation method and application of hydrogen gas-sensitive material and gas sensor

Abstract

The invention provides a hydrogen gas-sensitive material, a gas sensor, and a preparation method and application of the hydrogen gas-sensitive material and the gas sensor. The hydrogen gas-sensitive material comprises stannic oxide and stannous oxide in a molar ratio of 1: (1-2). The tin oxide and the stannous oxide with the molar ratio of 1: (1-2) are used as the hydrogen gas-sensitive material, can be used as the gas-sensitive material in a gas sensor, have relatively high sensitivity and selectivity to hydrogen, and can continuously and stably work in the air.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas-sensitive materials, in particular to a hydrogen gas-sensitive material, a gas sensor, and a preparation method and application thereof. BACKGROUND

[0002] Lithium batteries may cause thermal runaway due to overcharging, high temperature or mechanical damage, resulting in serious safety problems such as rapid temperature rise, fire and explosion. Before the thermal runaway of the lithium battery, volatile gases (such as dimethyl carbonate) and hydrogen gas and other characteristic gases are released, so the above characteristic gases can be detected as early warning signals.

[0003] Although the traditional characteristic gas detection method has high detection accuracy and can accurately identify and quantify the components of the gas generated by the thermal runaway of the lithium battery, it is difficult to be widely applied to online detection of field devices due to its high cost and large equipment size. For example, high-end instruments such as gas chromatography-mass spectrometry (GC-MS) and Fourier transform infrared spectroscopy (FTIR) require complex operating environments and professional technical personnel, and the equipment size is large, which cannot meet the needs of real-time monitoring in the field. SUMMARY

[0004] Therefore, it is necessary to provide a hydrogen gas-sensitive material capable of realizing real-time monitoring, a preparation method thereof, a gas sensor, a preparation method thereof and an application thereof.

[0005] The application provides a hydrogen gas-sensitive material, which comprises tin oxide and stannous oxide with a molar ratio of 1: (1-2).

[0006] The application further provides a preparation method of the hydrogen gas-sensitive material, which comprises the following steps:

[0007] mixing a metal tin salt and a polyvinylpyrrolidone solution in a mass ratio of (550-750) mg: (5-10) g, heat treating, and preparing a tin-containing material;

[0008] washing the tin-containing material with an acidic solution, centrifuging, and separating out a solid;

[0009] The pH value of the polyvinylpyrrolidone solution is 6-8, and the pH value of the acidic solution is 0.2-0.6.

[0010] In one of the embodiments, the metal tin salt comprises one or more of stannous chloride, tin tetrachloride and stannous sulfate.

[0011] In one of the embodiments, the heat treatment satisfies one or both of the following conditions:

[0012] (1) the temperature of the heat treatment is 160-200 DEG C; and / or

[0013] (2) the time of heat treatment is 10h-14h.

[0014] In one embodiment, the centrifugation satisfies one or two of the following conditions:

[0015] (1) the speed of centrifugation is 7000rpm-9000rpm;

[0016] (2) the time of centrifugation is 10min-40min.

[0017] Further, the application provides a gas sensor, which comprises a substrate, at least two test electrodes are arranged on one side surface of the substrate, and a heating layer is arranged on the other side surface of the substrate.

[0018] The test electrodes are provided with a gas sensitive layer on the side surface away from the substrate, and the material of the gas sensitive layer comprises the hydrogen gas sensitive material as described above or the hydrogen gas sensitive material prepared by the preparation method as described above.

[0019] The application further provides a preparation method of the gas sensor as described above, which comprises the following steps:

[0020] Preparation of at least two test electrodes on one side surface of a substrate and a heating layer on the other side surface of the substrate;

[0021] Mixing the hydrogen gas sensitive material and an adhesive, arranging on the side surface of the test electrodes away from the substrate, and sintering.

[0022] In one embodiment, one or two of the following conditions are satisfied:

[0023] (1) the adhesive comprises one or both of ethyl cellulose and terpineol;

[0024] (2) the mass ratio between the hydrogen gas sensitive material and the adhesive is 1:(0.5-1.5).

[0025] In one embodiment, the sintering satisfies one or two of the following conditions:

[0026] (1) the temperature of sintering is 450℃-550℃;

[0027] (2) the time of sintering is 1h-3h.

[0028] Further, the application provides the hydrogen gas sensitive material as described above or the hydrogen gas sensitive material prepared by the preparation method as described above or the gas sensor as described above for detecting hydrogen gas.

[0029] The application uses tin oxide and stannous oxide with a molar ratio of 1: (1-2) as a hydrogen gas sensitive material, which can be used as a gas sensitive material in a gas sensor, has high sensitivity and selectivity to hydrogen, and can work stably in air for real-time monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The gas sensor provided by the embodiment is a top view of (a) one side surface and (b) the other side surface, and (c) a sectional view.

[0032] Figure 2 The XPS spectrum of the hydrogen gas sensitive material of Example 1.

[0033] Figure 3 The response curve of the gas sensor made of the hydrogen gas sensitive material of Example 1 to different concentrations of hydrogen gas.

[0034] Figure 4 The response curve of the gas sensor made of the hydrogen gas sensitive material of Comparative Example 1 to different concentrations of hydrogen gas.

[0035] Figure 5 The response value comparison curve of the gas sensors made of the hydrogen gas sensitive materials of Example 1 and Comparative Example 1 to different concentrations of hydrogen gas.

[0036] Explanation of reference signs:

[0037] 10: gas sensor; 100: substrate; 110: test electrode; 111: gas sensitive layer; 120: heating layer. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0039] 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 belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0040] As used herein, the term "and / or" encompasses any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "A and / or B" includes three parallel options: A, B, and "a combination of A and B".

[0041] In this document, unless otherwise stated, "one or more" means any one of the listed items or any combination of the listed items. Similarly, "one or more" and other instances of "one or more" are to be understood in the same way unless otherwise stated.

[0042] In this document, terms such as "further," "even further," "especially," "for example," "like," "example," and "exemplary" are used for descriptive purposes to indicate a connection in the coverage of different technical solutions presented earlier and later. However, they should not be construed as limitations on the preceding technical solution or on the scope of protection of this document. Unless otherwise specified, in this document, A (e.g., B) indicates that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0043] In this document, "optionally," "optionally," and "optional" mean that something is optional, that is, it is selected from either "present" or "absent." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "option" is independent. In this application, descriptions such as "optionally contains" and "optionally includes" indicate "contains or does not contain." "Optional component X" indicates whether component X exists or does not exist, or whether component X is contained or not.

[0044] In this document, the terms "first aspect," "second aspect," "third aspect," and "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," and "fourth" serve only as a non-exhaustive enumeration and should be understood as not constituting a closed limitation on quantity.

[0045] In this article, the technical features described in an open-ended manner include both closed technical solutions composed of the listed features and open technical solutions that include the listed features.

[0046] In this document, when referring to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of selectable values ​​within a numerical interval is considered continuous, and includes the two endpoints (i.e., the minimum and maximum values) of the numerical interval, as well as every value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all subranges included therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, and other numerical interval types.

[0047] This application provides a hydrogen gas-sensitive material, comprising tin oxide and tin suboxide in a molar ratio of 1:(1~2).

[0048] Furthermore, the hydrogen gas-sensitive material may include, but is not limited to, tin oxide and tin suboxide in a molar ratio of 1:1 or 1:2.

[0049] This application uses tin oxide and stannous oxide in a molar ratio of 1:(1~2) as hydrogen gas-sensitive materials, which can be used as gas-sensitive materials in gas sensors. They have high sensitivity and selectivity to hydrogen and can work stably in air.

[0050] This application also provides a method for preparing a hydrogen gas-sensitive material, comprising the following steps:

[0051] Tin-containing materials are prepared by mixing tin salt and polyvinylpyrrolidone solution at a mass ratio of (550~750) mg : (35~40) g and heat treatment.

[0052] The tin-containing material was cleaned with an acidic solution, then centrifuged to separate the solid.

[0053] The pH value of the polyvinylpyrrolidone solution is 6 to 8, and the pH value of the acidic solution is 0.2 to 0.6.

[0054] In a specific example, the mass ratio of the tin salt and the polyvinylpyrrolidone solution may be, but is not limited to, 550 mg : 35 g, 550 mg : 36 g, 550 mg : 37 g, 550 mg : 38 g, 550 mg : 39 g, 550 mg : 40 g, 600 mg : 35 g, 600 mg : 36 g, 600 mg : 37 g, 600 mg : 38 g, 600 mg : 39 g, 600 mg : 40 g, 660 mg : 35 g, 660 mg : 36 g, 660 mg : 37 g, 660 mg : 38 g, 660 mg : 39 g, 660 mg : 40 g, 700 mg : 35 g, 700 mg : 36 g, 70 ... 37 g, 700mg : 38 g, 700mg : 39 g, 700mg : 40g, 750mg : 35 g, 750mg : 36 g, 750mg : 37 g, 750mg : 38 g, 750mg : 39 or 750mg : 40g.

[0055] Specifically, the polyvinylpyrrolidone solution comprises polyvinylpyrrolidone, a monobasic strong base, and a solvent in a mass ratio of (5~10): (0.1~0.8): (20~40). The monobasic strong base may be, but is not limited to, sodium hydroxide, and the solvent may be, but is not limited to, an inorganic solvent. Further, the inorganic solvent may be, but is not limited to, water.

[0056] Furthermore, the pH value of the acidic solution may be, but is not limited to, 0.2, 0.3, 0.4, 0.5, or 0.6. Understandably, the acidic solution may be, but is not limited to, one or both of hydrochloric acid and sulfuric acid solutions.

[0057] In one specific example, the metallic tin salt includes one or more of stannous chloride, stannous tetrachloride, and stannous sulfate.

[0058] In a specific example, the heat treatment temperature is 160℃~200℃; specifically, the heat treatment temperature may be, but is not limited to, 160℃, 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 195℃ and 200℃.

[0059] In a specific example, the heat treatment time is 10h to 14h. Specifically, the heat treatment time can be, but is not limited to, 10h, 11h, 12h, 13h or 14h.

[0060] In a specific example, the centrifugation speed is 7000 rpm to 9000 rpm; the centrifugation speed may be, but is not limited to, 7000 rpm, 7100 rpm, 7200 rpm, 7300 rpm, 7400 rpm, 7500 rpm, 7600 rpm, 7700 rpm, 7800 rpm, 7900 rpm, 8000 rpm, 8100 rpm, 8200 rpm, 8300 rpm, 8400 rpm, 8500 rpm, 8600 rpm, 8700 rpm, 8800 rpm, 8900 rpm, or 9000 rpm.

[0061] In a specific example, the centrifugation time is 10 min to 40 min. The centrifugation time can be, but is not limited to, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min or 40 min.

[0062] Furthermore, such as Figure 1 This application provides a gas sensor 10, which includes a substrate 100. At least two test electrodes 110 are disposed on one side surface of the substrate 100, and a heating layer 120 is disposed on the other side surface of the substrate.

[0063] The test electrode 110 has a gas-sensitive layer 111 disposed on the side surface away from the substrate 100. The material of the gas-sensitive layer 111 includes the hydrogen gas-sensitive material as described above or the hydrogen gas-sensitive material prepared by the preparation method described above.

[0064] Understandably, in order to further achieve good heating, the material of the heating layer 120 may be, but is not limited to, ruthenium oxide.

[0065] This application further provides a method for preparing the above-mentioned gas sensor 10, comprising the following steps:

[0066] At least two test electrodes 110 are formed on one side surface of the substrate 100, and a heating layer 120 is formed on the other side surface of the substrate 100.

[0067] Mix hydrogen gas-sensitive material and adhesive.

[0068] The test electrode is placed on the surface away from the substrate 100 and sintered.

[0069] In one specific example, the adhesive includes one or both of ethyl cellulose and terpineol. Further, the mass ratio between the hydrogen gas-sensitive material and the adhesive is 1:(0.5~1.5). Specifically, the mass ratio of the hydrogen gas-sensitive material and the adhesive of 1:(0.5~1.5) can be, but is not limited to, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, or 1:1.5.

[0070] Specifically, the gas-sensitive material, ethyl cellulose, and terpineol are mixed in a ratio of 1g:100mg:1mL.

[0071] In a specific example, the sintering temperature is 450℃~550℃; the sintering temperature may be, but is not limited to, 450℃, 460℃, 470℃, 480℃, 490℃, 500℃, 510℃, 520℃, 530℃, 540℃ or 550℃.

[0072] In a specific example, the sintering time is 1 hour to 3 hours. The sintering time can be, but is not limited to, 1 hour, 1.5 hours, 2 hours, 2.5 hours, or 3 hours.

[0073] Furthermore, this application provides the application of the hydrogen gas-sensitive material described above, or the hydrogen gas-sensitive material prepared by the preparation method described above, or the gas sensor described above, in the detection of hydrogen gas.

[0074] The present application will be further described in detail below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present application. For experimental methods in the following embodiments where specific conditions are not specified, please refer to the guidelines given in this application, or follow experimental manuals or conventional conditions in the art, or follow the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0075] In the specific embodiments described below, the measurement parameters of the raw material components may have slight deviations within the weighing accuracy range unless otherwise specified. For temperature and time parameters, acceptable deviations due to instrument testing accuracy or operational precision are permissible. "Ambient temperature" refers to 25°C; "atmospheric pressure" refers to 100 kPa or 101 kPa.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] Example 1

[0078] This embodiment provides a method for preparing a hydrogen gas-sensitive material, including the following steps:

[0079] Weigh 677 mg of stannous chloride dihydrate into a clean beaker, then add 8.5 g of polyvinylpyrrolidone (PVP, molecular weight 10000) to the beaker, followed by 0.577 g of sodium hydroxide, and finally add 30 ml of ultrapure water.

[0080] After adding all materials to the beaker, stir with a glass rod for five minutes to form a homogeneous solution. Then, add the mixture to the lining of the hydrothermal reactor. After assembling the hydrothermal reactor, place it in an oven with the reactor temperature set to 180 °C and the reaction time set to 12 h. After the reaction is complete and the oven temperature has dropped below 30 °C, remove the reactor.

[0081] Remove the supernatant using a disposable plastic dropper. The remaining white precipitate is then acid-washed: Mix 30 ml of ultrapure water with 1 ml of concentrated hydrochloric acid solution (37% concentration) and shake well to form a dilute hydrochloric acid solution. Add a small amount of ultrapure water to the liner and stir with a clean glass rod to form a homogeneous solution. Pour the solution into a centrifuge tube, then add the dilute hydrochloric acid solution to the centrifuge tube. Finally, centrifuge the tube in a centrifuge at 8000 rpm for 10 min.

[0082] After acid washing, remove the supernatant using a disposable plastic dropper, add deionized water to the centrifuge tube, and centrifuge twice more at a speed of 8000 rpm for 10 minutes.

[0083] After rinsing with water, remove the supernatant using a disposable plastic dropper, add anhydrous ethanol to the centrifuge tube, and centrifuge twice to rinse. The centrifugation speed is set to 8000 rpm and the centrifugation time is set to 10 min.

[0084] After all the above centrifugation operations are completed, use a disposable plastic dropper to remove the supernatant, add a small amount of deionized water to the centrifuge tube and shake well. Pour the shaken solution into a crucible of appropriate size and place it in a 60 ℃ forced-air drying oven for drying. After the solvent evaporates, powder containing hydrogen gas-sensitive material film can be obtained.

[0085] Furthermore, such as Figure 2 The XPS spectrum of the hydrogen gas-sensitive material prepared by the above steps shows that the prepared tin-based oxide contains Sn in an atomic ratio of 1:2. 4+ With Sn 2+ The coexistence can be understood as the hydrogen gas-sensitive material obtained in this example being tin oxide and tin suboxide in a molar ratio of 1:2.

[0086] The fabrication of a gas sensor using the aforementioned hydrogen gas-sensitive thin film as the gas-sensitive material includes the following steps:

[0087] A ceramic substrate is coated with gold electrodes and ruthenium oxide on the front and back sides using screen printing technology, and then dried at room temperature. Two electrode leads extending from one end are soldered to both sides and then fixed to the corresponding test terminals or heating elements. The electrode leads from the gold electrodes are connected to the test terminals, and the electrode leads from the ruthenium oxide electrodes are connected to the heating terminals.

[0088] Hydrogen gas-sensitive material powder, ethyl cellulose and terpineol were mixed in a ratio of 1g:100mg:1mL to form a uniform dispersion, which was then deposited onto the gold electrode of the sensor substrate by drop coating and sintered at 500 °C for 2 h.

[0089] After the gas sensor based on hydrogen gas-sensitive material thin film is fabricated, gas sensitivity testing of the gas sensor is required. Figure 3 The response curves (time / s, resistance / kΩ) of the gas sensor of Example 1 to different concentrations of hydrogen gas from low to high of 60, 100, 150, 300, 500, 800 and 1000 ppm are shown. The smaller graph is a magnified view of the time period from 7000s to 9500s. The numbers on the curves in the magnified graph represent the hydrogen concentration.

[0090] Comparative Example 1

[0091] The difference from Example 1 is that the tin salt used in the synthesis is replaced with tin tetrachloride. After the hydrothermal reaction is completed, the white precipitate is removed and not acid-washed; it is directly washed with deionized water by centrifugation. The remaining steps are the same as in Example 1. Finally, a single-valence tin-based compound, SnO2, is obtained as a hydrogen gas-sensitive material.

[0092] Figure 4 The response curves (time / s, resistance / kΩ) of a gas sensor prepared using the monovalent tin-based compound SnO2 as a hydrogen gas-sensitive material in Comparative Example 1 to different concentrations of hydrogen gas ranging from low to high (60, 100, 150, 300, 500, 800, 1000 ppm) are shown. The smaller plots are magnified views of the time range of 7000s to 9500s, and the numbers on the curves in the magnified plots represent the hydrogen concentration.

[0093] The resolution response of the gas sensor based on the hydrogen gas-sensitive material thin film prepared in the above embodiments to hydrogen gas was tested. The sensor's response resolution to hydrogen gas is not less than 200 ppb.

[0094] The gas sensor based on a hydrogen gas-sensitive material thin film prepared in Example 1 was tested for its response sensitivity to different concentrations of hydrocarbon gases. The gas sensor based on a single-valence tin-based oxide thin film prepared in Comparative Example 1 was also tested for its response sensitivity to different concentrations of hydrocarbon gases. Figure 5 The graph shows a comparison of the response values ​​of the sensors prepared in Example 1 and Comparative Example 1 to different concentrations of hydrogen gas. The sensor in Example 1 exhibits higher sensitivity for hydrogen gases at concentrations of 60 ppm, 100 ppm, 150 ppm, 300 ppm, 500 ppm, 800 ppm, and 1000 ppm. The response value is calculated as Ra / Rg, where Ra is the resistance in air, and Rg is the resistance in the target gas (hydrogen) at different concentrations. The numbers on the curves in the magnified graph represent the hydrogen concentration.

[0095] In this document, for methods involving multiple steps, unless otherwise explicitly stated herein, there is no strict order constraint on the execution of these steps; they may be executed in any order other than those described. Moreover, any step may include multiple sub-steps or multiple stages, which are not necessarily completed at the same time, but may be executed at different times, and their execution order is not necessarily sequential, but may be executed in turn, alternately, or simultaneously with other steps or parts of the sub-steps or stages of other steps.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims, and the specification and drawings can be used to interpret the scope of the claims.

Claims

1. A hydrogen gas-sensitive material, characterized in that, This includes tin oxide and tin suboxide with a molar ratio of 1:(1~2).

2. A method for preparing a hydrogen gas-sensitive material, characterized in that, Includes the following steps: Tin-containing materials are prepared by mixing tin salt and polyvinylpyrrolidone solution at a mass ratio of (550~750) mg : (35~40) g and heat treatment. The tin-containing material was cleaned with an acidic solution, and then centrifuged to separate the solid. The polyvinylpyrrolidone solution has a pH of 6 to 8, and the acidic solution has a pH of 0.2 to 0.

6.

3. The method for preparing the hydrogen gas-sensitive material as described in claim 2, characterized in that, The tin salt includes one or more of stannous chloride, stannous tetrachloride, and stannous sulfate.

4. The method for preparing the hydrogen gas-sensitive material as described in claim 2, characterized in that, Heat treatment must meet one or both of the following conditions: (1) The heat treatment temperature is 160℃~200℃; (2) The heat treatment time is 10h~14h.

5. The method for preparing the hydrogen gas-sensitive material according to any one of claims 2 to 4, characterized in that, Centrifugation satisfies one or two of the following conditions: (1) The centrifugation speed is 7000 rpm to 9000 rpm; (2) The centrifugation time is 10 min to 40 min.

6. A gas sensor, characterized in that, The gas sensor includes a substrate, on one side surface of which at least two test electrodes are disposed, and on the other side surface of which a heating layer is disposed; The test electrode has a gas-sensitive layer disposed on the surface away from the substrate, and the material of the gas-sensitive layer includes the hydrogen gas-sensitive material as described in claim 1 or the hydrogen gas-sensitive material prepared by the preparation method as described in any one of claims 2 to 5.

7. A method for preparing a gas sensor as described in claim 6, characterized in that, Includes the following steps: At least two test electrodes are prepared on one side surface of the substrate, and a heating layer is prepared on the other side surface of the substrate; The hydrogen gas-sensitive material and the adhesive are mixed, placed on the surface of the test electrode away from the substrate, and sintered.

8. The method for preparing a gas sensor as described in claim 7, characterized in that, One or two of the following conditions must be met: (1) The adhesive includes one or both of ethyl cellulose and terpineol; (2) The mass ratio between the hydrogen gas-sensitive material and the adhesive is 1: (0.5~1.5).

9. The method for preparing a gas sensor as described in claim 7 or 8, characterized in that, Sintering must meet one or both of the following conditions: (1) The sintering temperature is 450℃~550℃; (2) The sintering time is 1h~3h.

10. The application of the hydrogen gas-sensitive material as described in claim 1, or the hydrogen gas-sensitive material prepared by the preparation method as described in any one of claims 2 to 5, or the gas sensor as described in claim 6, in the detection of hydrogen gas.

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