Blast-assisted Joule heating method for uniformly activating carbon cloth and activated carbon cloth

Abstract

The invention discloses a blast-assisted Joule heating method for uniformly activating carbon cloth and activated carbon cloth, the method comprises the following steps: S1, cutting raw carbon cloth into a preset size specification, performing ultrasonic cleaning on the cut raw carbon cloth with deionized water and absolute ethyl alcohol respectively, and putting the cleaned raw carbon cloth into a drying box for complete drying; s2, clamping the dried carbon cloth between two electrodes of a Joule heating device, and introducing direct current to generate Joule heat so as to calcine the carbon cloth; s3, applying intensified air convection to the carbon cloth through a blower device while the direct current is introduced, and calcining the carbon cloth at the initial temperature for a preset time by regulating and controlling the current and the voltage to obtain the activated carbon cloth. The method disclosed by the invention is green, simple and controllable, relatively low in equipment requirement, low in energy consumption and capable of realizing uniform and efficient activation of the carbon cloth, so that the application requirement of a high-performance electrode material is met, and the method has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of supercapacitor electrode materials, and in particular to an air-assisted Joule heating method for uniformly activating carbon cloth, an activated carbon cloth, and a supercapacitor electrode material. Background Art

[0002] With the increasing depletion of traditional resources, the integration of renewable energy and efficient energy storage devices has become a research hotspot. Supercapacitors are considered one of the most promising energy storage devices in energy storage systems due to their rapid charge and discharge, high power density, and long cycle life. However, their relatively low energy density and the electrochemical properties of their electrode materials often limit their overall performance.

[0003] Carbon materials generally possess high conductivity and a large specific surface area, making them one of the most widely used electrode materials in supercapacitors. Carbon cloth, woven from carbon fibers, offers excellent flexibility and mechanical strength, high chemical stability, environmental friendliness, and low cost. However, raw carbon cloth's hydrophilicity and small specific surface area make it unsuitable for direct use as a supercapacitor electrode material. Traditionally, carbon cloth has been used as a current collector, with various active materials grown on top, or porosity increased through high-temperature calcination or chemical oxidation. However, these methods often involve complex steps, high energy consumption, or the use of hazardous chemicals.

[0004] To improve carbon cloth activation efficiency and reduce energy consumption, carbon cloth can be used as a self-heating conductor, converting electrical energy directly into thermal energy applied to the surface. This method rapidly increases temperature and reduces heat loss. However, at relatively low temperatures (<500°C), Joule-heated carbon cloth exhibits a significant surface thermal gradient, with the highest temperature in the center and the lowest temperature at the edges, which can easily lead to uneven activation.

[0005] Therefore, it is crucial to develop a new method that is green, low-energy, uniformly activated, and highly efficient to meet the application requirements of high-performance electrode materials. Summary of the Invention

[0006] The present invention aims to address some of the challenges of the prior art to a certain extent. To this end, the first objective of the present invention is to propose an air-assisted Joule heating method for uniformly activating carbon cloth. This method is simple to operate, environmentally friendly, highly controllable, requires minimal equipment, consumes little energy, and is highly efficient. It achieves uniform activation of carbon cloth, effectively improving its performance and possessing promising application prospects.

[0007] The second object of the present invention is to provide an activated carbon cloth.

[0008] The third object of the present invention is to provide an electrode material for a supercapacitor.

[0009] To achieve the above objectives, a first embodiment of the present invention provides an air blast-assisted Joule heating method for uniformly activating carbon cloth, the method comprising:

[0010] S1, cutting the virgin carbon cloth into preset size specifications, and ultrasonically cleaning the cut virgin carbon cloth with deionized water and anhydrous ethanol respectively, and placing the cleaned virgin carbon cloth in a drying oven to completely dry;

[0011] S2, clamping the dried carbon cloth between two electrodes of a Joule heating device, passing direct current to generate Joule heat to calcine the carbon cloth;

[0012] S3, while applying direct current, applying forced air convection to the carbon cloth through a blower, and calcining the carbon cloth at an initial temperature for a preset time by regulating current and voltage to obtain activated carbon cloth.

[0013] In addition, the air blast-assisted Joule heating method for uniformly activating carbon cloth according to the above embodiment of the present invention may also have the following additional technical features:

[0014] According to one embodiment of the present invention, the preset size specification is a rectangle of 1 cm×3 cm.

[0015] According to one embodiment of the present invention, each ultrasonic cleaning process lasts for approximately 30 minutes.

[0016] According to one embodiment of the present invention, the cleaned raw carbon cloth is dried in the drying oven for 12 hours, and the temperature in the drying oven is 60°C.

[0017] According to one embodiment of the present invention, the blowing device includes a component capable of adjusting wind speed and wind path, so as to concentrate most of the stable airflow to the central area of ​​the carbon cloth.

[0018] According to one embodiment of the present invention, the initial temperature is 320° C. to 400° C., and the preset time is 15 minutes.

[0019] To achieve the above-mentioned object, a second embodiment of the present invention provides an activated carbon cloth, which is prepared by the air-assisted Joule heating method for uniformly activating the carbon cloth according to the above-mentioned embodiment.

[0020] To achieve the above-mentioned object, a third embodiment of the present invention provides an electrode material for a supercapacitor, wherein the electrode material for the supercapacitor includes the activated carbon cloth of the above-mentioned embodiment.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By introducing forced air convection during the Joule heating process, this method creates air-assisted Joule heating, effectively enhancing the convective heat transfer capacity in the central region of the carbon cloth, improving cooling efficiency and alleviating the problems of large temperature gradients and uneven thermal field distribution present in traditional Joule heating. This method significantly improves the temperature consistency of the carbon cloth during heating, resulting in a more uniform heat treatment effect, helping to enhance the stability and controllability of activation, and thus improving overall activation efficiency. The method of the present invention is simple, safe, and environmentally friendly, offering significant advantages over traditional activation methods.

[0023] The air-blasting process not only regulates the thermal field but also accelerates the diffusion rate of air onto the carbon cloth surface, promoting the etching of unstable carbon on the carbon fiber surface and significantly increasing the porosity and specific surface area of ​​the carbon cloth. Electrochemical testing has shown that carbon cloth treated with this method exhibits higher specific capacitance and excellent electrochemical performance under the same treatment time conditions, showing promising application prospects and being particularly suitable for the preparation of high-performance supercapacitor electrode materials.

[0024] Additional aspects and advantages of the present invention will be further clarified in the description below, and some advantages will become obvious from the description below, or can be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of an air blast-assisted Joule heating method for uniformly activating carbon cloth according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of activated carbon cloth obtained by air blast-assisted Joule heating adopted in the present invention;

[0027] Figure 3 Scanning electron microscope (SEM) images of three carbon cloth samples (initial carbon cloth, activated carbon cloth obtained by Joule heating, and activated carbon cloth obtained by air blast-assisted Joule heating) in Example 1 of the present invention;

[0028] Figure 4 The temperature change curves during Joule heating and blast-assisted Joule heating in Example 1 of the present invention are as follows;

[0029] Figure 5 X-ray diffraction (XRD) patterns of three carbon cloth samples (initial carbon cloth, activated carbon cloth obtained by Joule heating, and activated carbon cloth obtained by air blast-assisted Joule heating) in Example 1 of the present invention;

[0030] Figure 6 Raman spectra of three carbon cloth samples (initial carbon cloth, activated carbon cloth obtained by Joule heating, and activated carbon cloth obtained by air-assisted Joule heating) in Example 1 of the present invention;

[0031] Figure 7 Statistical diagram of element distribution of three carbon cloth samples (initial carbon cloth, activated carbon cloth obtained by Joule heating, and activated carbon cloth obtained by air blast-assisted Joule heating) in Example 1 of the present invention;

[0032] Figure 8 Cyclic voltammetry (CV) and constant current charge-discharge (GCD) curves of the activated carbon cloth prepared under Joule heating and blast-assisted Joule heating conditions in Example 1 of the present invention;

[0033] Figure 9 Graphs showing the electrochemical performance of the activated carbon cloth prepared under Joule heating and air-assisted Joule heating conditions in Example 1 of the present invention, including rate capability, electrochemical impedance spectroscopy (EIS), and cycling stability.

[0034] Figure 10 Cyclic voltammetry (CV) and constant current charge-discharge (GCD) curves of the activated carbon cloth prepared under Joule heating and blast-assisted Joule heating conditions in Examples 2 and 3 of the present invention. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0036] The following describes an air blast-assisted Joule heating method for uniformly activating carbon cloth, activated carbon cloth, and an electrode material for a supercapacitor, as provided in embodiments of the present invention, with reference to the accompanying drawings.

[0037] like Figure 1 As shown, the air blast-assisted Joule heating method for uniformly activating carbon cloth according to an embodiment of the present invention may include the following steps:

[0038] S1, cutting the virgin carbon cloth into preset size specifications, and ultrasonically cleaning the cut virgin carbon cloth with deionized water and anhydrous ethanol respectively, and placing the cleaned virgin carbon cloth in a drying oven to completely dry.

[0039] According to one embodiment of the present invention, the preset size is a rectangle of 1 cm×3 cm.

[0040] Specifically, the virgin carbon cloth is first cut to a predetermined size, such as a 1cm x 3cm rectangle. The cut virgin carbon cloth is then ultrasonically cleaned in an ultrasonic cleaner filled with deionized water to remove particulate matter and dust from the surface. The deionized water-washed virgin carbon cloth is then ultrasonically cleaned in an ultrasonic cleaner filled with anhydrous ethanol. Anhydrous ethanol has excellent solubility and can dissolve residual organic matter on the carbon cloth surface, further improving its cleanliness. According to one embodiment of the present invention, each ultrasonic cleaning cycle lasts for approximately 30 minutes.

[0041] After cleaning is completed, the cleaned raw carbon cloth is placed in a drying oven to be completely dried. According to one embodiment of the present invention, the cleaned raw carbon cloth is dried in a drying oven for 12 hours, and the temperature in the drying oven is 60°C.

[0042] S2, clamping the dried carbon cloth between two electrodes of a Joule heating device, passing direct current to generate Joule heat to calcine the carbon cloth.

[0043] S3, while applying direct current, applying forced air convection to the carbon cloth through a blower, and calcining the carbon cloth at an initial temperature for a preset time by regulating current and voltage to obtain activated carbon cloth.

[0044] According to one embodiment of the present invention, the blowing device includes a component capable of adjusting wind speed and wind path, so as to concentrate most of the stable airflow to the central area of ​​the carbon cloth.

[0045] According to one embodiment of the present invention, the initial temperature is 320° C. to 400° C., and the preset time is 15 minutes.

[0046] Specifically, if Figure 2 As shown, the carbon cloth is connected to an external DC power supply through an electrode fixture to generate Joule heat when electricity is turned on. At the same time, the blowing device concentrates most of the air flow in the central area of ​​the sample to enhance convective heat transfer and alleviate the non-uniform thermal field phenomenon caused by temperature gradient, thereby making the thermal field distribution more uniform; at the same time, the blowing process accelerates the diffusion of gas on the surface of the carbon cloth, increases its surface porosity and specific surface area, and improves the electrochemical properties of the material.

[0047] The following describes in detail the air blast-assisted Joule heating method for uniformly activating carbon cloth in conjunction with three embodiments. The meanings of the English abbreviations in the following embodiments are as follows:

[0048] ACC (Activated CC): A carbon material with a high specific surface area and good electrical conductivity, typically obtained by activating raw carbon cloth. In the present invention, ACC is used as an electrode material, exhibiting a large specific surface area and excellent electrochemical performance.

[0049] PCC (Primary CC): refers to the initial carbon cloth that has not been activated;

[0050] ACC-ST (Activated CC - Static Temperature): Carbon cloth activated by Joule heating at temperature T in a static atmosphere. For example, activated carbon cloth obtained by Joule heating at 400°C is ACC-S400.

[0051] ACC-DT (Activated CC - Dynamic Temperature): A carbon cloth activated by air-assisted Joule heating at a temperature T in a dynamic atmosphere. For example, an activated carbon cloth obtained by air-assisted Joule heating at 400°C is ACC-D400.

[0052] Example 1

[0053] First, the virgin carbon cloth was cut into a rectangle of 1 cm × 3 cm, ultrasonically cleaned with deionized water and anhydrous ethanol for 30 min respectively until it was clean, and then dried in a drying oven at 60 ° C for 12 h to obtain PCC.

[0054] 2. The dried carbon cloth was clamped between two electrodes of a Joule heating device, and direct current was passed through the carbon cloth to generate Joule heat. The voltage and current were adjusted so that the initial temperature was 400°C. After calcination for 15 minutes, ACC-S400 was obtained.

[0055] 3. While power is applied in step 2, forced air convection is applied to the carbon cloth through a blower. The voltage and current are adjusted so that the initial temperature is 400°C. ACC-D400 is obtained after calcination for 15 minutes.

[0056] Example 2

[0057] First, the virgin carbon cloth was cut into a rectangle of 1 cm × 3 cm, ultrasonically cleaned with deionized water and anhydrous ethanol for 30 min respectively until it was clean, and then dried in a drying oven at 60 ° C for 12 h to obtain PCC.

[0058] 2. The dried carbon cloth was clamped between two electrodes of a Joule heating device, and direct current was passed through the carbon cloth to generate Joule heat. The voltage and current were adjusted to make the initial temperature 360°C. After calcination for 15 minutes, ACC-S360 was obtained.

[0059] 3. While power is applied in step 2, forced air convection is applied to the carbon cloth through a blower. The voltage and current are adjusted so that the initial temperature is 360°C. ACC-D360 is obtained after calcination for 15 minutes.

[0060] Example 3

[0061] First, the virgin carbon cloth was cut into a rectangle of 1 cm × 3 cm, ultrasonically cleaned with deionized water and anhydrous ethanol for 30 min respectively until it was clean, and then dried in a drying oven at 60 ° C for 12 h to obtain PCC.

[0062] 2. The dried carbon cloth was clamped between two electrodes of a Joule heating device, and direct current was passed through the carbon cloth to generate Joule heat. The voltage and current were adjusted to make the initial temperature 320°C. After calcination for 15 minutes, ACC-S320 was obtained.

[0063] 3. While power is applied in step 2, forced air convection is applied to the carbon cloth through a blower. The voltage and current are adjusted so that the initial temperature is 320°C. ACC-D320 is obtained after calcination for 15 minutes.

[0064] Figure 2 The overall structure of the air-assisted Joule heating activation device of the present invention is demonstrated. A rectangular carbon cloth is connected to an external DC power supply via an electrode fixture, generating Joule heating when energized. Simultaneously, the air-blowing device concentrates most of the airflow in the center of the sample, enhancing convective heat transfer and alleviating the uneven thermal field caused by temperature gradients, thereby achieving a more uniform thermal field distribution. Furthermore, the air-blowing process accelerates gas diffusion across the carbon cloth surface, increasing its surface porosity and specific surface area, and improving the material's electrochemical performance.

[0065] Figure 3 The SEM images of three carbon cloth samples (PCC, ACC-S400 and ACC-D400) in Example 1 of the present invention are shown. Figure 3 a It can be seen that the surface of PCC is flat and smooth, with basically no obvious structural features. In contrast, ACC-S400 ( Figure 3 b) Slight undulations and wrinkles appeared on the surface, indicating that Joule heating has induced some reconstruction of the carbon cloth surface structure, but the overall structure has not changed significantly. Figure 3 c) A large number of evenly distributed microporous structures appeared on the surface, the overall morphology became significantly rougher, and the number of pores increased significantly. These results prove that the air blowing condition can accelerate the diffusion of air on the carbon cloth surface and promote the formation of pores.

[0066] Figure 4 The temperature curves for Joule heating and air-assisted Joule heating in Example 1 of the present invention are shown. The solid line represents the real-time temperature change at a particular time, the dots represent the average temperature values ​​obtained from multiple experiments, and the vertical error bars indicate the standard deviation of the temperature measurements at each time point. The figure shows that the average temperature for Joule heating tends to rise. While the real-time temperature for air-assisted Joule heating fluctuates slightly due to the introduction of forced air convection, the average temperature remains around 400°C, making the average temperature change relatively stable.

[0067] Figure 5 The XRD patterns of three carbon cloth samples (PCC, ACC-S400, and ACC-D400) from Example 1 of the present invention are shown. All samples exhibit reflection peaks from the (002) and (110) planes of the carbon material at diffraction angles of ~25° and ~43°, respectively. The peak of the activated carbon cloth is the sharpest, indicating a relatively high degree of graphitization. After heat treatment, the carbon peaks of both activated samples broaden, with the peak of the blast-activated sample showing a more pronounced expansion, indicating a decrease in crystallinity and an increase in disordered components.

[0068] Figure 6 The Raman images of three carbon cloth samples (PCC, ACC-S400 and ACC-D400) in Example 1 of the present invention are shown. -1 and ~1580cm -1 The typical crystal defect characteristic peak of carbon material and the stretching vibration peak of ordered graphite carbon are D peak and G peak respectively, and the intensity ratio of the two can be used to measure the degree of graphitization of carbon material. D / I G ) was 1.07, ACC-S400 was 1.05, and ACC-D400 increased significantly to 1.15. Under blast conditions, the I D / I G The ratio increases significantly, indicating that the defect content in its carbon structure increases and the degree of graphitization decreases, which further confirms the conclusion that the oxidation reaction is more complete and more pores are formed during the air blast activation process.

[0069] Figure 7 Element distribution statistics for three carbon cloth samples (PCC, ACC-S400, and ACC-D400) from Example 1 of the present invention are shown. PCC is primarily carbon, but also contains a small amount of sodium (Na) due to the production process, and a certain proportion of oxygen (O) has been detected. Carbon content decreased under both heating methods. Compared to the samples treated with air blast, the oxygen content increased from 0.36% in PCC to 1.81% in ACC-D400, indicating that air flow promotes oxygen participation, introducing more oxidation reactions and oxygen-containing functional groups.

[0070] Figure 8 The CV and GCD curves of the activated carbon cloth prepared under Joule heating and blast-assisted Joule heating conditions in Example 1 of the present invention are shown. Figure 8 a) It can be seen that at 0.1V s -1At a scan rate of 100 nm, both ACC-S400 and ACC-D400 exhibit typical rectangular capacitance curves, indicating that energy storage is mainly contributed by double-layer capacitance. Among them, the ACC-D400 curve has the largest area, indicating that it has a higher charge storage capacity. GCD curve ( Figure 8 b) Further demonstration of ACC-D400 at 0.4 mA cm -2 The discharge time is the longest at the current density, and the calculated specific capacitance of ACC-S400 is 81.84mF cm -2 ACC-D400 has a specific capacitance of 256.8 mF cm -2 , both of which are significantly higher than the specific capacitance of commercial PCC (~1mF cm -2 ), which also confirmed that the activated carbon cloth obtained by air-assisted Joule heating was better.

[0071] Figure 9 The electrochemical performance diagrams of the rate performance, EIS test, and cycle stability test of ACC-S400 and ACC-D400 in Example 1 of the present invention are shown. Figure 9 a shows the area specific capacitance of ACC-S400 at different current densities. -2 Expanded to 4 mA cm -2 When the specific capacitance is maintained at 94.1% (77mF cm -2 ), while the specific capacitance of ACC-D400 was retained at 90.8% (233 mF cm) after the current density was increased 10 times. -2 ), indicating that they all have good rate performance. EIS test curves are as follows Figure 9 As shown in Figure b, the curve consists of a semicircle in the high-frequency region and a slant line in the low-frequency region. In the high-frequency region, the intersection of the semicircle arc and the real axis is the equivalent series resistance (Rs), and the diameter of the semicircle is the charge transfer resistance (Rct). The Rct of ACC-D400 is slightly higher, which may be due to the introduction of more oxygen-containing functional groups, but its richer pore structure makes its overall electrochemical performance still better than ACC-S400. It is worth noting that at 4 mA cm -2 After 10,000 cycles of testing at current density ( Figure 9 c) The capacitance of ACC-D400 is almost unchanged, and the capacitance retention rate and coulombic efficiency are 93.73% (218.39 mF cm -2 ) and 97.48%, showing excellent cycling stability and reversibility.

[0072] Figure 10 The CV and GCD curves of ACC-S360, ACC-D360, ACC-S320 and ACC-D320 in Examples 2 and 3 of the present invention are shown. Figure 10 As shown in a), under the condition of using only Joule heating, whether it is calcined at 320℃ or 360℃, the CV curve graph shows rectangular characteristics and a relatively small area. Under the condition of using blast-assisted Joule heating, the area of ​​the CV curve graph increases significantly, indicating that the activated carbon cloth obtained by blast-assisted Joule heating has higher electrochemical performance. CP curve ( Figure 10 b) It further shows that the sample obtained by air blast-assisted Joule heating has a longer charge and discharge duration, and its specific capacitance is 12.8mF cm-1 of ACC-S320. -2 Improved to 16.92mF cm for ACC-D320 -2 , 25.6mF cm for ACC-S360 -2 Improved to 56.6mF cm for ACC-D360 -2 It can be seen that air blast-assisted Joule heating has obvious advantages in improving the performance of activated carbon cloth.

[0073] Corresponding to the above embodiment, the present invention also proposes an activated carbon cloth.

[0074] The activated carbon cloth of the embodiment of the present invention is prepared by the air blast-assisted Joule heating method for uniformly activating the carbon cloth according to the above embodiment.

[0075] Corresponding to the above embodiment, the present invention further proposes an electrode material for a supercapacitor.

[0076] The electrode material of the supercapacitor according to the embodiment of the present invention comprises the activated carbon cloth according to the above embodiment.

[0077] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0080] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A blast-assisted Joule heating method for uniformly activating carbon cloth, characterized in that: The method comprises: S1, cutting the virgin carbon cloth into preset size specifications, and ultrasonically cleaning the cut virgin carbon cloth with deionized water and anhydrous ethanol respectively, and placing the cleaned virgin carbon cloth in a drying oven to completely dry; S2, clamping the dried carbon cloth between two electrodes of a Joule heating device, passing direct current to generate Joule heat to calcine the carbon cloth; S3, while applying direct current, applying forced air convection to the carbon cloth through a blower, and calcining the carbon cloth at an initial temperature for a preset time by regulating current and voltage to obtain activated carbon cloth.

2. The air blast-assisted Joule heating method for uniformly activating carbon cloth according to claim 1, characterized in that: The preset size specification is a rectangle of 1 cm×3 cm.

3. The air blast-assisted Joule heating method for uniformly activating carbon cloth according to claim 1, characterized in that: Each ultrasonic cleaning lasted for 30 min.

4. The air blast-assisted Joule heating method for uniformly activating carbon cloth according to claim 1, characterized in that: The cleaned raw carbon cloth was dried in the drying oven for 12 hours at a temperature of 60°C.

5. The air blast-assisted Joule heating method for uniformly activating carbon cloth according to claim 1, characterized in that: The air blowing device includes components capable of adjusting wind speed and wind path, and is used to concentrate most of the stable airflow to the central area of ​​the carbon cloth.

6. The air blast-assisted Joule heating method for uniformly activating carbon cloth according to claim 1, characterized in that: The initial temperature is 320° C. to 400° C., and the preset time is 15 minutes.

7. An activated carbon cloth, characterized in that: The activated carbon cloth is prepared by the air blast-assisted Joule heating method for uniformly activating carbon cloth according to any one of claims 1 to 6.

8. An electrode material for a supercapacitor, characterized in that: The electrode material comprises the activated carbon cloth according to claim 7.

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