Device and method for continuously treating alkaline electrolysis anode through dielectric barrier discharge

Abstract

The invention discloses a device and method for continuously treating an alkaline electrolysis anode through dielectric barrier discharge, and the device comprises a modularized DBD reaction chamber which is used for carrying out the surface treatment of an anode material through plasma formed between high-voltage electrode arrays; the conveying belt system is used for continuously conveying the anode material to pass through the DBD reaction chamber; according to the gas distribution system, working gas is introduced into the discharge gap, mixed gas of argon and nitrogen is introduced into the DBD reaction chamber, and specific plasma characteristics are achieved through the synergistic effect of gas components; and the multi-stage temperature control unit is used for controlling the temperature of the anode material in processing. The device has extremely high batch processing capacity, the modularized DBD reaction chamber supports multi-anode parallel processing, continuous operation is achieved through the conveying belt, and the processing efficiency is improved by more than 10 times compared with that of laboratory equipment. The anode material is subjected to plasma treatment, so that the electrochemical active area of the anode material is greatly optimized, the energy consumption of an electrolytic bath is effectively reduced, and the service time of the anode material is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and particularly to a device and method for continuously treating an anode of an alkaline electrolyzer by dielectric barrier discharge. Background Art

[0002] Industrial alkaline electrolyzers (such as chlor-alkali electrolyzers, water electrolysis hydrogen production devices) are core equipment in the chemical and energy fields. The performance of their anode materials directly determines the electrolysis efficiency, energy consumption, and equipment life. In an alkaline environment, common anode materials include nickel-based alloys (such as Ni-Fe, Ni-Co), titanium-based coated electrodes (such as titanium-based IrO2 / RuO2 coatings), etc. These materials face two major bottleneck problems during long-term operation at high current densities: Surface passivation: During the electrolysis process, a dense oxide layer (such as NiO, TiO2) is easily formed on the anode surface, hindering the contact between active sites and the electrolyte, resulting in a decrease in the electrochemically active surface area (ECSA).

[0003] Research shows that after the traditional nickel anode operates for 1000 hours, the effective active area loss can reach more than 40%.

[0004] Insufficient mechanical / chemical stability: Although existing surface treatment technologies (such as chemical etching, sandblasting roughening) can temporarily increase the active area, the microstructure after treatment is prone to structural collapse or corrosion in an environment of strong alkali, high temperature, and bubble erosion, resulting in rapid performance decay.

[0005] Analysis of the limitations of existing technologies: Chemical etching method: The anode surface is corroded with strong acids (such as HCl, HNO3) or strong alkalis (such as NaOH) to form a porous structure. However, it has the following defects: Difficult to control process parameters (concentration, temperature), prone to over-corrosion or local perforation; Generates heavy metal-containing wastewater, violating environmental protection requirements such as the EU REACH regulation; Unable to achieve precise regulation of three-dimensional nanoscale structures, with uneven distribution of active sites.

[0006] Mechanical processing method: Increase the surface roughness by means of sandblasting, laser etching, etc. However, there are: Limited improvement in micron-scale roughness, and the specific surface area increase is usually less than 20%; High-energy mechanical action may introduce internal stress, reducing the fatigue resistance of the material; High equipment investment, difficult to process electrodes with complex geometries (such as porous nickel foam).

[0007] Coating modification technology: Coating noble metal catalysts (such as IrO2) or carbon-based materials on the anode surface can improve the catalytic activity, but it faces the following problems: The high cost of noble metals (the price of IrO2 exceeds $1000 per ounce) restricts large-scale applications; the poor adhesion between the coating and the substrate makes the coating prone to peeling under the action of bubble stripping; the coating processes (such as thermal decomposition and electrodeposition) have high energy consumption and large carbon emission intensity.

[0008] In view of the above, it is necessary to propose a method for continuously treating the anode of an alkaline electrolytic cell by dielectric barrier discharge to solve the above problems. By optimizing the DBD process parameters, a micro-nano structure with both high activity and high stability is constructed on the surface of alkaline-tolerant materials (such as Ni and Ti), so that the anode material can maintain a relatively high effective active area during long-term operation at a high current density. Summary of the Invention

[0009] The purpose of the present invention is to overcome the defects existing in the prior art and provide a device and method for continuously treating an alkaline electrolytic anode by dielectric barrier discharge.

[0010] To achieve the above purpose, the technical solution of the present invention is as follows: A device for continuously treating the anode of an alkaline electrolytic cell by dielectric barrier discharge includes a modular DBD reaction chamber, which performs surface treatment on the anode material through the plasma formed between the high-voltage electrode arrays; A conveyor belt system, which is used to continuously transport the anode material through the DBD reaction chamber. The front end of the conveyor belt is connected to the pretreatment section, and the rear end is connected to the post-treatment section; A gas distribution system, which introduces a working gas into the discharge gap and is used to generate plasma. A mixed gas of argon (Ar) and nitrogen (N2) is introduced into the DBD reaction chamber, and specific plasma characteristics are achieved through the synergistic action of gas components; A multi-stage temperature control unit, which is used to control the temperature of the anode material during processing.

[0011] Further, the modular DBD reaction chamber includes a plurality of DBD treatment units arranged in parallel. Each DBD treatment unit includes a high-voltage electrode array, a dielectric layer, a discharge gap, and a grounded electrode. An electrode spacing is formed between the high-voltage electrode arrays. The dielectric layer covers the surface of the high-voltage electrode, and the anode material passes through the discharge gap as the grounded electrode.

[0012] Further, the conveyor belt system includes at least transmission belts arranged in parallel on both sides of the high-voltage electrode array. The two ends of the anode material are placed on the two transmission belts, so that the anode material is transported in a suspended manner in the middle.

[0013] Furthermore, the dielectric layer is made of ceramic or quartz material, and air holes for introducing working gas into the discharge gap are formed in the dielectric layer, and the uniformity deviation of the gas introduced into the electrode spacing is <5%.

[0014] Furthermore, the high-voltage electrode array adopts an interleaved multi-needle-plate electrode structure, the tip curvature radius of the needle electrode is ≤50 μm, the electrode spacing is adjustable, and the adjustment range of the electrode spacing is 5-20 mm.

[0015] Furthermore, the conveyor belt system controls the anode material to pass through the DBD reaction chamber at a uniform speed of 0.1-1 m / min, and a real-time temperature detection device and an air-cooling system are provided in the DBD reaction chamber to control the surface temperature of the anode material at 80-150 °C.

[0016] A method for continuously treating the anode of an alkaline electrolytic cell by dielectric barrier discharge includes the following steps: S1: Pretreatment, ultrasonic cleaning of the anode material in the pretreatment section, and then successively cleaning with an alkaline degreaser, deionized water, and absolute ethanol, and then drying. S2: Continuous conveyance, the dried anode material is transferred to the conveyor belt system and sent to the DBD reaction chamber. S3: Surface treatment, a plasma is formed in the DBD reaction chamber to process the surface of the anode material to form microcracks, and a working gas formed by introducing an argon / nitrogen mixed gas is introduced between the electrode spacings. S4: Post-treatment, the conveyor belt system sends the anode material to the post-treatment section, and cools the anode material to room temperature under a nitrogen protection environment.

[0017] Furthermore, the ratio of the introduced argon / nitrogen mixed gas is 1:1~3:1, and the flow rate is 50-200 L / min; The discharge parameters of the high-frequency high-voltage power supply used in the DBD reaction chamber are: the pulse power supply frequency is 10-50 kHz, the duty cycle is 30-70%, and the power density is 0.5-3 W / cm².

[0018] Furthermore, it also includes a closed-loop gas circulation device, which recovers and recycles the working gas and the post-treatment gas, and includes a condenser, a molecular sieve adsorption tower, and a gas flow linkage controller. After the waste gas removes volatile organic compounds through the condenser, it is regenerated and reused through the molecular sieve adsorption tower, and the gas recovery rate is ≥85%.

[0019] The advantages and beneficial effects of the present invention are as follows: 1. It has extremely high batch processing capacity. The modular DBD reaction chamber supports parallel processing of multiple anodes, and continuous operation is achieved through the conveyor belt, and the processing efficiency is increased by more than 10 times compared with laboratory equipment.

[0020] 2. The anode material is treated by plasma, which greatly optimizes the electrochemically active area of the anode material, effectively reduces the energy consumption of the electrolytic cell, and increases the service life of the anode material.

[0021] 3. Multi-stage temperature control (air cooling + water cooling) is adopted to ensure that the temperature fluctuation on the anode surface is < ±5°C, avoiding the lattice distortion of the metal caused by high temperature and improving the process stability of the anode material processing.

[0022] 4. This device can be integrated into the existing anode production line of the electrolytic cell, forming uniform micro-cracks on the surface of the produced anode material product, and supporting automatic control (PLC + SCADA system).

[0023] 5. This process does not require other catalysts to be loaded, greatly saving the processing cost of the anode material. Description of the Drawings

[0024] Figure 1 is the system flow block diagram of a method for continuously treating the anode of an alkaline electrolytic cell by dielectric barrier discharge according to the present invention; Figure 2 is the schematic diagram of the DBD treatment device in the present invention; Figure 3 is the microscopic comparison diagram before and after the treatment of the anode material in the present invention (a is the surface appearance before treatment, and b is the controllable cracks formed on the surface after treatment); Figure 4 is the three-dimensional view of the lifting control structure in the present invention; Figure 5 is the longitudinal sectional view of the lifting control structure in the present invention; Figure 6 is the axonometric view of the conveyor belt system and the high-voltage electrode array in the present invention; In the figure: 1. DBD reaction chamber; 2. High-voltage electrode array; 3. Dielectric layer; 4. Discharge gap; 5. Ground electrode; 6. Needle electrode; 7. Anode material; 8. Conveyor belt system; 9. First transmission belt; 10. Second transmission belt; 11. Upper electrode; 12. Lower electrode; 13. Lifting adjustment frame; 14. Lifting screw rod; 15. Frame body; 16. Synchronous shaft; 17. Servo motor; 18. High-frequency high-voltage power supply. Detailed Embodiments

[0025] The following combines the drawings and embodiments to further describe the specific embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0026] A device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge comprises a modular DBD reaction chamber 1, which performs surface treatment on anode material 7 by plasma formed between high-voltage electrode arrays 2; specifically, Figure 2 As shown, the DBD reaction chamber 1 includes a high voltage electrode array 2, a dielectric layer 3, a discharge gap 4, and a ground electrode 5; In this embodiment, the high-voltage electrode array 2 adopts a staggered multi-needle-plate electrode structure, and high-voltage electrodes are arranged at a certain distance on the upper and lower sides of the anode material 7. The high-voltage electrodes are close to each other on one side to form a plurality of needle electrodes 6. The needle electrodes 6 on the surface of the high-voltage electrode are arranged in an array, and the needle electrodes 6 on the two high-voltage electrodes are arranged in staggered positions, so that the needle tips are staggered to form an asymmetric electric field. The needle tips of the two groups of needle electrodes 6 are staggered, which avoids excessive local discharge caused by excessive concentration of the electric field at the facing position, and avoids the generation of hot spots or breakdown; it can also make the plasma distribution more uniform, improve the consistency of the surface treatment of the anode material 7, and thus improve the quality and stability of the product. The staggered needle electrodes 6 can activate more discharge channels at the same voltage, increase the plasma density, and thus shorten the processing time.

[0027] like Figure 2 , 6 As shown, the dielectric layer 3 is made of ceramic or quartz material and covers the surface of the high-voltage electrode. It is used to prevent direct discharge and promote the formation of stable plasma in the discharge gap 4. Combined with the staggered arrangement of needle electrodes 6, the electric field distortion between the needle tip and the anode can be reduced, reducing the risk of micro-arcs.

[0028] The discharge gap 4 is the space between the anode material 7 and the dielectric layer 3. In this embodiment, the working gas is introduced into the discharge gap 4. Specifically, in this embodiment, the dielectric layer 3 is made of a porous ceramic plate, and a gas flow channel with a diameter of about 10-100 μm is formed inside the porous ceramic plate. The gas flow channel formed on the porous ceramic plate constitutes a gas distribution system, and the gas distribution system makes the uniformity deviation of the gas introduced into the discharge gap 4 less than 5%. The argon / nitrogen mixed gas is uniformly introduced through the pores of the porous ceramic plate. When used, the gas mixing ratio can be controlled in the range of 1:1~3:1, and the flow rate is 50-200 L / min; The working gas is introduced into the discharge gap 4 and ionized to form active particles, which are used to treat the surface of the anode material 7. Since different gas mixtures will affect the characteristics of the plasma, such as electron density, the type of active particles and the uniformity of discharge, this embodiment utilizes the respective characteristics of argon and nitrogen, mixes them and produces a synergistic effect.

[0029] Argon is an inert gas with a relatively low ionization energy, which is easily ionized to form a high-density plasma. Moreover, it has many metastable atoms, which can extend the lifetime of active particles. Nitrogen has a relatively high ionization energy, but nitrogen plasma can generate active nitrogen species, such as excited N2 molecules, atomic nitrogen, N radicals, etc., which play an important role in the surface treatment of the anode material 7. Mixing these two gases combines the advantages of both. Argon acts as a carrier gas to help reduce the breakdown voltage and maintain stable discharge, while nitrogen provides active nitrogen species to participate in surface reactions. The working gas formed by mixing the two gases has the following advantages: 1. Improve plasma density and uniformity; 2. Promote specific surface reactions; 3. Reduce energy consumption because argon is easily ionized. In addition, the mixed gas may affect the discharge mode, avoid arc discharge, and maintain stable glow discharge.

[0030] The mixing ratio of the working gas (Ar:N2 = 1:1~3:1) can be selected according to actual production. For example, a high Ar ratio (such as 3:1): dominated by Ar, maintaining a high electron density and enhancing plasma uniformity; a low Ar ratio (such as 1:1): increasing the N2 ratio to enhance the concentration of active nitrogen species, but a higher voltage is required to compensate for the ionization difficulty; the nitriding reaction rate is fast, suitable for deep doping or rapid functionalization treatment.

[0031] Specifically, in this embodiment, a plasma is generated by ionizing a gas through a high-voltage electric field in a DBD reactor. The ions in the plasma bombard the material surface, and physical etching forms cracks on the surface of the anode material 7, that is, controllable cracks are created on the metal surface through plasma treatment. Surface defects can increase catalytic active sites. This embodiment is for processing the anode material 7 used in industrial alkaline electrolytic cells, and the performance of this anode material 7 directly determines the electrolysis efficiency, energy consumption, and equipment life. In actual use, common anode materials 7 include nickel-based alloys and titanium-based coated electrodes; taking nickel-based alloys as an example, microscopic cracks are formed on the nickel mesh surface to create defects, such as Figure 3 As shown, catalytic active sites are increased through surface defects, thereby increasing the effective active area; when a nickel-based alloy is used as the anode for electrolyzing water, the number and stability of surface active sites directly affect the oxygen evolution reaction (OER) efficiency; surface defects (such as cracks, grain boundaries, oxygen vacancies) can provide additional catalytic active sites, reducing the reaction energy barrier. At the same time, the rough surface can delay the formation of the passivation layer, so that the anode material 7 can maintain a relatively high effective active area during long-term operation at a high current density. Compared with traditional technologies, this processing method increases the active area of the anode material 7 by 300%~400%, which is suitable for industrial surface modification of electrolytic cell anodes.

[0032] Control the size and distribution of cracks within a better range through DBD process parameters to avoid a decrease in material strength or an acceleration of corrosion. Specifically, the working gas is uniformly introduced into the discharge gap 4, and the controller ensures that the uniformity deviation is < 5%. The argon / nitrogen mixed gas (ratio 1:1 - 3:1) is uniformly introduced through the porous ceramic plate, and the flow rate is controlled at 50 - 200 L / min. The high-voltage electrodes on both sides of the anode material 7 are respectively connected to the high-frequency high-voltage power supply 18. The discharge parameters controlled by the high-frequency high-voltage power supply 18 are: pulse power frequency 10 - 50 kHz, duty cycle 30 - 70%, and power density 0.5 - 3 W / cm²; the high-voltage electrode array 2 adopts an interleaved multi-needle-plate electrode structure, and the tip curvature radius of the needle electrode 6 is ≤ 50 μm. The anode material 7 is inserted between the high-voltage electrodes as the grounding electrode 5. In this embodiment, in a continuous processing manner, the anode material 7 is continuously fed into the DBD reaction chamber 1 through a conveyor belt. The conveyor belt moves at a speed of 0.1 - 1 m / min to control the uniform passing of the anode material 7 through the DBD reaction chamber; and there is a multi-stage temperature control unit to strictly control the temperature during the processing of the anode material 7. During the processing, the surface temperature is monitored in real time by an infrared thermometer, and the corresponding control temperature is selected according to the specifications of the processed anode material 7. The selectable control temperatures for different anode materials 7 are 80 - 150 °C; after determining the control temperature for a certain type of anode material 7, the surface temperature of the anode material 7 is controlled through the multi-stage temperature control mechanism set in this device, including air cooling and / or water cooling, to ensure that the surface temperature fluctuation of the anode is < ±5 °C, thereby avoiding the metal lattice distortion caused by high temperature.

[0033] As an embodiment, there is a conveyor belt system 8 for transporting the anode material 7 to transfer and process between various workstations. It is used to continuously transport the anode material 7 into the DBD reaction chamber 1 for plasma bombardment processing, and the front end of the conveyor belt is connected to the pretreatment section, and the rear end is connected to the post-treatment section; thus, a continuous production is formed to improve production efficiency; thereby enabling the modular DBD reaction chamber to support multi-anode parallel processing, realizing continuous operation through the conveyor belt, and the processing efficiency is increased by more than 10 times compared with laboratory equipment. The processing speed of a single production line can reach 50 - 100 pieces per hour (calculated based on a 1000×1000 mm anode).

[0034] Specifically, the conveyor belt system 8 at least includes transmission belts arranged in parallel on both sides of the high-voltage electrode array 2. The two ends of the anode material 7 are placed on the two transmission belts, so that the anode material 7 forms a suspended translation in the middle. The two parallel transmission belts can be set in a form with adjustable lateral spacing, so as to be applicable to the transportation of anode materials 7 of different sizes and specifications. The two transmission belts support the two side edges of the anode material 7 to make the middle part suspended, and the suspended part can pass through the two high-voltage electrodes in the DBD reaction chamber 1, so as to facilitate the processing of the surface of the anode material 7.Figure 1 , 6 As shown in 6 , the conveyor belt system 8 includes a first conveyor belt 9 and a second conveyor belt 10, the spacing between which is adapted to the anode material 7 to be processed. During production, the anode material can be placed on the conveyor belt, and the two conveyor belts operate synchronously, so as to control the anode material 7 to move through the DBD reaction chamber 1 at a required speed. The conveyor belt system 8 controls the anode material 7 to pass through the DBD reaction chamber at a constant speed of 0.1 - 1 m / min.

[0035] As another embodiment, the electrode spacing of the high-voltage electrode in the DBD reaction chamber 1 is adjustable to adapt to the required processing requirements. Specifically, the DBD reaction chamber 1 is provided with an upper electrode 11 and a lower electrode 12. The structures of the electrodes on both sides are the same and are arranged in mirror symmetry. Each side of the electrode includes a high-voltage electrode array 2 and a dielectric layer 3, and when adjusting, the spacing between it and the anode material 7 is also adjusted synchronously and symmetrically; the adjustable range of the electrode spacing can be selected from 5 - 20 mm. Specifically, in this embodiment, as Figure 4 , 5 shown in 5 , lifting adjustment frames 13 are provided on both the upper and lower sides of the conveyor belt, and the electrodes on both sides are respectively installed on the corresponding lifting adjustment frames 13. As an implementation manner, the lifting of the lifting adjustment frame 13 is controlled by a lifting screw rod 14, so that the lifting screw rods 14 are distributed around the lifting adjustment frame 13 and controlled to rotate synchronously. The lifting screw rods 14 around are rotationally installed on the frame body 15, and the top gears of the lifting screw rods are connected to a synchronous shaft 16, and the synchronous shaft 16 is driven to rotate by a servo motor 17, so as to realize synchronous lifting control of the lifting adjustment frame 13. And the lifting screw rod 14 can be selected as a bidirectional screw rod, so that the two lifting adjustment frames 13 are respectively screwed on different thread sections, so as to realize mirror movement control. Optionally, the two lifting adjustment frames 13 are respectively connected to hydraulic cylinders or electric cylinders, and then the lifting control of the lifting adjustment frames 13 is respectively controlled to change the distance of the discharge gap 4.

[0036] Furthermore, multiple DBD processing units can be arranged in parallel on the conveyor belt system 8 for the modular DBD reaction chamber 1 to meet the processing duration of the anode material 7, or multiple DBD processing units can be set with different powers and gaps, so as to realize different depths of the processed texture on the surface of the anode material 7.

[0037] As an embodiment, the system also integrates a closed-loop gas circulation device, which recovers and recycles the working gas and the post-treatment gas, and includes a condenser, a molecular sieve adsorption tower, and a gas flow linkage controller; the working gas input into the DBD reactor and the cooling nitrogen used in the post-treatment system are recovered and utilized, so as to reduce costs. After the waste gas removes volatile organic compounds through the condenser, it is regenerated and reused through the molecular sieve adsorption tower, and the gas recovery rate ≥ 85%.

[0038] A method for continuously treating the anode of an alkaline electrolytic cell by dielectric barrier discharge, comprising the following steps: S1: Pretreatment. The anode material 7 is ultrasonically cleaned in the pretreatment section and sequentially cleaned with an alkaline degreaser, deionized water, and absolute ethanol, and then dried. The anode material 7 enters the ultrasonic cleaning tank through a conveyor belt, is sequentially cleaned with an alkaline degreaser (pH 10-12), deionized water, and absolute ethanol, and after drying, enters the plasma treatment section.

[0039] S2: Continuous conveyance. The dried anode material 7 is transferred to the conveyor belt system 8 and sent to the DBD reaction chamber.

[0040] S3: Surface treatment. Plasma is formed in the DBD reaction chamber 1 to process the surface of the anode material 7 to form microcracks. The modular DBD reaction chamber is composed of at least three parallel processing units; a working gas formed by introducing an argon / nitrogen mixed gas is passed between the electrode spacings; an interlaced multi-needle-plate electrode structure is adopted, the electrode spacing is adjustable (5-20 mm), and the dielectric layer 3 is made of ceramic or quartz material and covers the surface of the high-voltage electrode; the anode material 7 itself serves as the grounding electrode 5, and the gas distribution system: an argon / nitrogen mixed gas (ratio 1:1~3:1) is uniformly introduced through a porous ceramic plate, and the flow rate is 50-200 L / min. During the treatment process, the surface temperature (80-150°C) is monitored in real time by an infrared thermometer, and the temperature is dynamically adjusted by an air-cooling system.

[0041] S4: Post-treatment. The conveyor belt system 8 sends the anode material 7 into the post-treatment section, and the anode material 7 is cooled to room temperature under a nitrogen protection environment.

[0042] The gas circulation system recovers and treats the waste gas. Specifically, after the waste gas removes volatile organic compounds through a condenser, it is regenerated and reused through a molecular sieve adsorption tower, and the gas recovery rate is ≥85%; Production capacity: The processing speed of a single production line can reach 50-100 pieces per hour (calculated based on a 1000×1000 mm anode).

[0043] The modular DBD reaction chamber supports parallel processing of multiple anodes, realizes continuous operation through a conveyor belt, and the processing efficiency is increased by more than 10 times compared with laboratory equipment; the active area is increased by 300%-400%, which is suitable for industrial surface modification of the anode of the electrolytic cell.

[0044] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge, characterized in that: The invention comprises a modular DBD reaction chamber (1) for performing surface treatment on an anode material (7) by means of plasma formed between a high voltage electrode array (2); A conveyor belt system (8) for continuously transporting the anode material (7) through the DBD reaction chamber (1), wherein the front end of the conveyor belt is connected to a pre-treatment section and the rear end is connected to a post-treatment section; A gas distribution system for introducing a working gas into the discharge gap (4); A multi-stage temperature control unit is used to control the temperature of the anode material (7) being processed.

2. The device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 1, characterized in that: The modular DBD reaction chamber (1) comprises a plurality of DBD processing units arranged in parallel, each DBD processing unit comprising a high-voltage electrode array (2), a dielectric layer (3), a discharge gap (4), and a grounding electrode (5), an electrode gap is arranged between the high-voltage electrode arrays (2), the dielectric layer (3) covers the surface of the high-voltage electrode, and the anode material (7) serves as a grounding electrode (5) and passes through the electrode gap.

3. The device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 2, characterized in that: The conveyor belt system (8) comprises at least transmission belts arranged in parallel on both sides of the high-voltage electrode array (2), and the two end edges of the anode material (7) are mounted on the two transmission belts, so that the anode material (7) is transported in a suspended translation manner in the middle.

4. The device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 2, characterized in that: The dielectric layer (3) is made of ceramic or quartz material, and pores are formed in the dielectric layer (3) for the working gas to pass into the discharge gap (4). The uniformity deviation of the gas passing into the discharge gap (4) is less than 5%.

5. The device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 2, characterized in that: The high-voltage electrode array (2) adopts a staggered multi-needle-plate electrode structure, the tip curvature radius of the needle electrode (6) is ≤50 μm, and the electrode spacing is adjustable within a range of 5 to 20 mm.

6. The device for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 5, characterized in that: The conveyor belt system (8) controls the anode material (7) to pass through the DBD reaction chamber at a uniform speed of 0.1-1 m / min; the multi-stage temperature control unit includes a real-time temperature detection device and an air cooling system arranged in the DBD reaction chamber to control the surface temperature of the anode material (7) to be 80-150°C.

7. The method for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 1, characterized in that: The following steps are involved: S1: pretreatment, in which the anode material (7) is ultrasonically cleaned in the pretreatment section, and then sequentially cleaned with an alkaline degreasing agent, deionized water, and anhydrous ethanol, and then dried; S2: Continuously conveying, the dried anode material (7) is transferred to the conveyor system (8) and sent to the DBD reaction chamber; S3: surface treatment, plasma is formed in the DBD reaction chamber (1) to process the surface of the anode material (7) to form micro cracks to increase catalytic active sites, and a working gas formed by an argon / nitrogen mixed gas is introduced between the electrode gaps; S4: post-processing, the conveyor belt system (8) conveys the anode material (7) to the post-processing section, and cools the anode material (7) to room temperature under a nitrogen protection environment.

8. The method for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 7, characterized in that: The ratio of argon / nitrogen mixed gas introduced is 1:1~3:1, and the flow rate is 50-200 L / min; The DBD reaction chamber (1) uses a high-frequency high-voltage power supply (18) with discharge parameters of: pulse power frequency 10-50 kHz, duty cycle 30-70%, power density 0.5-3 W / cm².

9. The method for continuously treating alkaline electrolytic cell anodes by dielectric barrier discharge according to claim 7, characterized in that: It also includes a closed-loop gas circulation device, which recovers and recycles the working gas and post-processing gas. It includes a condenser, a molecular sieve adsorption tower, and a gas flow linkage controller. After the volatile organic matter in the exhaust gas is removed by the condenser, the exhaust gas is regenerated and reused through the molecular sieve adsorption tower. The gas recovery rate is ≥85%.

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