Hydrogen peroxide generator and preparation method of hydrogen peroxide

Abstract

The invention belongs to the technical field of hydrogen peroxide, and particularly relates to a hydrogen peroxide generator and a preparation method of hydrogen peroxide. The hydrogen peroxide generator provided by the invention comprises an anode end plate, an anode embedded with a sealing gasket, a first sealing gasket, a snakelike flow channel insulating plate, a second sealing gasket, a cathode embedded with the sealing gasket and a cathode end plate which are overlapped in sequence, the snake-shaped flow channel is filled with ion exchange resin; the tops of the anode end plate and the cathode end plate are provided with power supply connecting ends; an inlet and an outlet are formed in the surfaces of the anode end plate, the anode embedded in the sealing gasket, the first sealing gasket and the snakelike flow channel insulating plate, the inlet is communicated with one end of the snakelike flow channel, and the outlet is communicated with the other end of the snakelike flow channel. According to the hydrogen peroxide generator, ion exchange resin is adopted to construct a proton transmission medium between the cathode and the anode, a porous honeycomb structure can construct a continuous proton transmission channel, efficient proton conduction is guaranteed, and meanwhile anion cross contamination is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen peroxide technology, specifically relating to a hydrogen peroxide generator and a method for preparing hydrogen peroxide. Background Technology

[0002] Hydrogen peroxide is widely used in drinking water treatment, medical disinfection, semiconductor cleaning, and fuel cells. Currently, the anthraquinone process is mainly used in industry to produce hydrogen peroxide. However, this method has risks of flammability and explosion during hydrogenation under high temperature and high pressure conditions, the potential for decomposition during the storage and transportation of high-concentration hydrogen peroxide, and pollution from anthraquinone derivatives and solvents.

[0003] Compared to the traditional anthraquinone process, electrochemical synthesis offers advantages such as higher efficiency and greater environmental friendliness. However, traditional electrochemical synthesis uses liquid electrolytes, leaving inorganic salt impurities after the reaction, requiring desalting to purify the product. This process not only increases energy consumption and equipment costs but may also lead to the decomposition of hydrogen peroxide during purification, reducing its effective concentration. Summary of the Invention

[0004] In view of this, the present invention provides a hydrogen peroxide generator and a method for preparing hydrogen peroxide. The hydrogen peroxide generator provided by the present invention is simple and easy to operate, and can efficiently prepare high-concentration hydrogen peroxide solutions.

[0005] To solve the above-mentioned technical problems, the present invention provides a hydrogen peroxide generator, comprising a positive end plate, an anode with an embedded sealing gasket, a first sealing gasket, a serpentine flow channel insulating plate, a second sealing gasket, a cathode with an embedded sealing gasket, and a negative end plate stacked in sequence; the serpentine flow channel insulating plate is filled with ion exchange resin in its serpentine flow channel.

[0006] The top of the anode and cathode end plates are provided with power connection terminals;

[0007] The anode end plate, the anode with embedded sealing gasket, the first sealing gasket, and the surface of the serpentine flow channel insulating plate are provided with an inlet and an outlet. The inlet is connected to one end of the serpentine flow channel in the serpentine flow channel insulating plate, and the outlet is connected to the other end of the serpentine channel in the serpentine flow channel insulating plate.

[0008] Preferably, the anode includes an anode substrate and an anode active layer disposed on the surface of the anode substrate;

[0009] The anode substrate is titanium, and the composition of the anode active layer includes an iridium-tantalum mixture and / or cobalt oxide;

[0010] The thickness of the anode substrate is 0.8–1.2 mm, and the thickness of the anode active layer is 9–11 μm.

[0011] Preferably, the cathode includes a cathode substrate and a diffused electrode layer loaded on the surface of the cathode substrate;

[0012] The cathode substrate is a conductive porous material with a thickness of 1-5 mm, and the diffusion electrode layer is obtained by sintering a mixture of carbon powder and polytetrafluoroethylene.

[0013] Preferably, the first sealing gasket is a hollow structure, the center of the hollow structure is on the same horizontal line as the center of the anode, and the area of ​​the hollow structure is smaller than the area of ​​the anode;

[0014] The thickness of the first sealing gasket is 1.8 to 2.2 mm.

[0015] Preferably, the second sealing gasket is a hollow structure, the center of the hollow structure is on the same horizontal line as the center of the cathode, and the area of ​​the hollow structure is smaller than the area of ​​the cathode;

[0016] The thickness of the second sealing gasket is 1.8 to 2.2 mm.

[0017] Preferably, the thickness of the serpentine flow channel insulation plate is 2-4 mm.

[0018] Preferably, the cathode end plate and the anode end plate are made of metal, and the thickness of the cathode end plate and the anode end plate is independently 220-240mm;

[0019] The cathode end plate has a hollow structure.

[0020] Preferably, the average particle size of the ion exchange resin is 50-100 mesh.

[0021] The present invention also provides a method for preparing hydrogen peroxide using the hydrogen peroxide generator described above, comprising the following steps:

[0022] Water is introduced into the hydrogen peroxide generator through the inlet on the surface of the anode plate. An electrochemical reaction takes place in the chamber formed by the first sealing gasket of the anode plate, the flow channel insulating plate, the second sealing gasket, and the cathode plate. The generated hydrogen peroxide flows out through the outlet on the surface of the anode plate.

[0023] Preferably, the current density of the electrochemical reaction is 30–300 mA / cm². 2 ;

[0024] The flow rate of water introduced into the hydrogen peroxide generator is 0.1–10 mL / min.

[0025] This invention provides a hydrogen peroxide generator, comprising, in sequence, an anode end plate, an anode with an embedded sealing gasket, a first sealing gasket, a serpentine flow channel insulating plate, a second sealing gasket, a cathode with an embedded sealing gasket, and a cathode end plate; the serpentine flow channel of the insulating plate is filled with ion exchange resin; a power connection terminal is provided at the top of the anode and cathode end plates; an inlet and an outlet are provided on the surfaces of the anode end plate, the anode with the embedded sealing gasket, the first sealing gasket, and the serpentine flow channel insulating plate, the inlet being connected to one end of the serpentine flow channel, and the outlet being connected to the other end of the serpentine channel. The hydrogen peroxide generator provided by this invention uses ion exchange resin to construct the proton transport medium between the cathode and anode. Its porous honeycomb structure can construct a continuous proton transport channel, effectively reducing anion cross-contamination while ensuring efficient proton conduction. This invention uses ion exchange resin as a solid electrolyte, eliminating the need for a liquid electrolyte circulation system and its corresponding sealing structure. During application, water only needs to be added after a period of operation, simplifying the device structure and reducing production costs. This invention can adjust the electrode distance between the cathode and anode by utilizing the thickness of the serpentine flow channel insulating plate, thereby controlling the production of hydrogen peroxide. Attached Figure Description

[0026] Figure 1 The schematic diagram of the hydrogen peroxide generator provided by the present invention shows that 1-inlet, 2-anode end plate, 3-first sealing gasket, 4-anode embedded in the sealing gasket, 5-serpentine flow channel insulating plate, 6-ion exchange resin, 7-cathode embedded in the sealing gasket, 8-cathode and cathode power connection terminal, 9-outlet, 10-cathode end plate, and 11-second sealing gasket.

[0027] Figure 2 The graph shows a comparison of the concentrations of hydrogen peroxide solutions prepared under different current densities in Examples 1-4. Detailed Implementation

[0028] The present invention provides a hydrogen peroxide generator, comprising, in sequence, an anode end plate, an anode with an embedded sealing gasket, a first sealing gasket, a serpentine flow channel insulating plate, a second sealing gasket, a cathode with an embedded sealing gasket, and a cathode end plate.

[0029] In one specific embodiment of the present invention, the anode end plate can be made of metal, such as aluminum, stainless steel, or silver-plated metal; the thickness of the anode end plate can be 220-240mm, specifically 220mm, 230mm, or 240mm; an inlet can be provided on the surface of the anode end plate, located at the lower end of the surface of the anode end plate; and an outlet can be provided on the surface of the anode end plate, located at the upper end of the surface of the anode end plate.

[0030] In one specific embodiment of the present invention, the anode may include an anode substrate and an anode active layer disposed on the surface of the anode substrate; the anode substrate may be titanium, and the composition of the anode active layer may include an iridium-tantalum mixture and / or cobalt oxide, specifically an iridium-tantalum mixture or cobalt oxide; the thickness of the anode substrate may be 0.8–1.2 mm, specifically 1 mm; the thickness of the anode active layer may be 9–11 μm, specifically 10 μm. In another specific embodiment of the present invention, the anode surface of the embedded sealing gasket is provided with an inlet and an outlet.

[0031] In one specific embodiment of the present invention, a serpentine flow channel can be formed on the surface of the anode end plate facing the anode. One end of the serpentine flow channel is connected to the inlet of the anode end plate, and the other end of the serpentine flow channel is connected to the inlet of the anode. In this invention, the reactant (water) can flow along the serpentine flow channel across the entire anode surface.

[0032] In one specific embodiment of the present invention, the first sealing gasket can be a hollow structure, the center of which can be on the same horizontal line as the anode center. The area of ​​the hollow structure is smaller than the area of ​​the anode. The present invention does not place special requirements on the degree to which the area of ​​the hollow structure is smaller than the area of ​​the anode, as long as sufficient contact between the resin and the anode is ensured. In one specific embodiment of the present invention, the hollow structure in the first sealing gasket can be square, the size of which can be 2.0 × 2.0 cm; the thickness of the first sealing gasket can be 1.8–2.2 mm, specifically 2 mm. In the present invention, the hollow structure in the first sealing gasket can serve as an anode positioning groove that matches the anode. In one specific embodiment of the present invention, the surface of the first sealing gasket is provided with an inlet and an outlet. In the present invention, the cavity formed between the anode embedded in the sealing gasket, the first sealing gasket, and the serpentine flow channel insulating plate is the anode chamber.

[0033] In one specific embodiment of the present invention, the thickness of the serpentine flow channel insulation plate can be 2-4 mm, specifically 2 mm, 3 mm, or 4 mm; the material of the serpentine flow channel insulation plate can include PEEK board or acrylic board. In another specific embodiment of the present invention, the surface of the serpentine flow channel insulation plate is provided with an inlet and an outlet.

[0034] This invention allows for the control of the electrode distance between the cathode and anode by adjusting the thickness of the serpentine flow channel insulation plate. Under the same flow rate conditions, increasing the insulation thickness of the serpentine flow channel leads to an increase in the electrode distance between the cathode and anode, thereby increasing the concentration of hydrogen peroxide generated. Under the same insulation thickness of the serpentine flow channel, decreasing the flow rate prolongs the reaction time, which also helps to increase the concentration of hydrogen peroxide generated. In an embodiment of this invention, at a flow rate of 0.5 mL / min and a serpentine flow channel insulation thickness of 4 mm, a maximum instantaneous hydrogen peroxide solution of 8200 ppm can be generated.

[0035] In this invention, the serpentine flow channel of the insulating plate is filled with ion exchange resin; the average particle size of the ion exchange resin can be 50-100 mesh, specifically 50 mesh, 60 mesh, 70 mesh, 80 mesh, 90 mesh, or 100 mesh. In this invention, the ion exchange resin serves as a solid electrolyte, and the ion exchange resin is uniformly distributed in the grooves of the serpentine flow channel insulating plate to form a continuous proton conduction layer.

[0036] In this invention, the anode end plate, the anode with embedded sealing gasket, the first sealing gasket, and the inlet on the surface of the serpentine flow channel insulation plate are connected to one end of the serpentine flow channel in the serpentine flow channel insulation plate, and the opening on the surface of the anode end plate, the anode with embedded sealing gasket, the first sealing gasket, and the serpentine flow channel insulation plate are connected to the other end of the serpentine channel in the serpentine flow channel insulation plate.

[0037] In one specific embodiment of the present invention, the second sealing gasket can be a hollow structure, with the center of the hollow structure on the same horizontal line as the cathode center. The area of ​​the hollow structure is smaller than the area of ​​the cathode. The present invention does not impose special requirements on the degree to which the area of ​​the hollow structure is smaller than the area of ​​the cathode, as long as sufficient contact between the resin and the cathode is ensured. In another specific embodiment of the present invention, the thickness of the second sealing gasket can be 2-3 mm, specifically 2 mm or 3 mm. In this invention, the hollow structure in the second sealing gasket can serve as a cathode positioning groove matching the cathode. The hollow structure in the second sealing gasket can be square, with dimensions of 2.0 × 2.0 cm. In this invention, the cavity formed between the serpentine flow channel insulating plate, the second sealing gasket, and the cathode embedded in the sealing gasket is the cathode chamber.

[0038] In one specific embodiment of the present invention, the cathode may include a cathode substrate and a diffusion electrode layer loaded on the surface of the cathode substrate; the cathode substrate may be a conductive porous material, which may include stainless steel mesh, nickel foam, or graphite felt; the thickness of the cathode substrate may be 1 to 5 mm, specifically 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm; the diffusion electrode layer may be obtained by sintering a mixture of carbon powder and polytetrafluoroethylene, and the thickness of the diffusion electrode layer may be 0.5 to 1 mm, specifically 0.5 mm or 1 mm. In one specific embodiment of the present invention, the average particle size of the carbon powder can be 28-32 nm, specifically 30 nm; the mass ratio of the carbon powder to polytetrafluoroethylene can be 4-6:3, specifically 5:3; the sintering temperature can be 300-400℃, specifically 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, 380℃, or 390℃; the heating rate to the sintering temperature can be 2-3℃ / min, specifically 2℃ / min, 2.5℃ / min, or 3℃ / min; the sintering time can be 1-4 h, specifically 2 h, 3 h, or 4 h. In another specific embodiment of the present invention, the cathode can be a discontinuous air-absorbing electrode with a surface microcrack anti-electrowetting structure disclosed in Chinese Patent CN 116024597 A.

[0039] In this invention, the diffusion electrode layer is adjacent to the ion exchange resin. In this invention, the diffusion electrode layer forms a continuous gas diffusion channel within the cathode substrate (e.g., graphite felt), optimizing the oxygen mass transfer path and obtaining more reactants.

[0040] In one specific embodiment of the present invention, the cathode end plate can be made of metal, such as aluminum, stainless steel, or silver-plated metal; the thickness of the cathode end plate can be 220-240mm, specifically 220mm, 230mm, or 240mm; the cathode end plate can have a perforated structure; the perforated structure of the cathode end plate facing the cathode can be square, and the perforated structure of the cathode end plate facing the air can be circular, wherein the side length of the square can be 2cm, and the diameter of the circle can be 2cm; the present invention provides a perforated structure on the cathode end plate to better transmit oxygen from the air.

[0041] In this invention, the top of the anode and cathode end plates are provided with power connection terminals; this invention uses high-strength metal as the anode and cathode end plates, which has a certain strength to suppress sealing failure during installation and operation, while also being inexpensive and taking into account the cost control requirements of large-scale production.

[0042] In this invention, the anode end plate, the anode with embedded sealing gasket, the first sealing gasket, the serpentine flow channel insulating plate, the second sealing gasket, the cathode with embedded sealing gasket, and the cathode end plate can be connected by screws.

[0043] Figure 1 This is a schematic diagram of a hydrogen peroxide generator, where 1-inlet, 2-anode end plate, 3-first sealing gasket, 4-anode with embedded sealing gasket, 5-serpentine flow channel insulating plate, 6-ion exchange resin, 7-cathode with embedded sealing gasket, 8-anode and cathode power connection terminal, 9-outlet, 10-cathode end plate, and 11-second sealing gasket.

[0044] The hydrogen peroxide generator provided by this invention uses ion exchange resin as a solid electrolyte to avoid the generation of salt byproducts, thereby achieving the direct preparation of high-purity hydrogen peroxide. This simplifies the process and avoids interference from residual ions in subsequent applications.

[0045] The present invention also provides a method for preparing hydrogen peroxide using the hydrogen peroxide generator described above, comprising the following steps:

[0046] Water is introduced into the hydrogen peroxide generator through the inlet on the surface of the anode plate. An electrochemical reaction takes place in the chamber formed by the first sealing gasket of the anode plate, the flow channel insulating plate, the second sealing gasket, and the cathode plate. The generated hydrogen peroxide flows out through the outlet on the surface of the anode plate.

[0047] In one specific embodiment of the present invention, the water can be pure water; the current density of the electrochemical reaction can be 30–300 mA / cm². 2 Specifically, it can be 50mA / cm 2 100mA / cm 2 130mA / cm 2 150mA / cm 2 180mA / cm 2 200mA / cm 2 230mA / cm 2 250mA / cm 2 280mA / cm 2 Or 300mA / cm 2 .

[0048] As a specific embodiment of the present invention, the flow rate of water introduced into the hydrogen peroxide generator can be 0.1 to 10 mL / min, or 0.5 to 8 mL / min, or even 1 to 5 mL / min.

[0049] In one specific embodiment of the present invention, when the hydrogen peroxide generator is working, water enters from the inlet and flows into the anode chamber and cathode chamber to carry out an electrochemical reaction. The hydrogen peroxide formed flows out from the outlet, and the water enters from the bottom and exits from the top.

[0050] This invention utilizes the unique ion-selective transport characteristics of solid electrolytes to construct a proton transport pathway without the involvement of liquid salt media, avoiding the desalting and purification steps required in traditional processes. The product can be used directly, solving the core problem of salt residue restricting the application of traditional electrochemical synthesis.

[0051] This invention utilizes a salt-free electrochemical hydrogen peroxide generator reactor to prepare hydrogen peroxide. The solid electrolyte system completely avoids the generation of salt byproducts through a solid proton conduction mechanism, achieving the direct preparation of high-purity hydrogen peroxide. This simplifies the process and avoids interference from residual ions in subsequent applications.

[0052] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0053] Example 1

[0054] Reference Figure 1 The structure of the hydrogen peroxide generator is as follows: the anode end plate is made of stainless steel with a thickness of 230mm. The inlet is set at the lower end of the stainless steel, the outlet is set at the upper end, and the anode power supply connection terminal is set at the top. A serpentine channel is set on one side of the anode end plate, which is in direct contact with the anode.

[0055] The anode substrate in the anode with embedded sealing gasket is a titanium plate with dimensions of 25×25×1mm (length×width×thickness), and the surface of the anode substrate is a cobalt oxide anode active layer with a thickness of 10μm; the anode is embedded in the sealing gasket to obtain the anode with embedded sealing gasket; an inlet is provided at the lower end of the anode and an outlet is provided at the upper end;

[0056] The thickness of the first sealing gasket is 2mm, and the size of the hollow structure in the first sealing gasket is 2.0×2.0cm.

[0057] The thickness of the serpentine PEEK plate is 2mm. The lower end of the serpentine PEEK plate is provided with an inlet and the upper end is provided with an outlet. Ion exchange resin with an average particle size of 50 mesh is filled into the serpentine channel. The serpentine channel has an inlet at one end and an outlet at the other end.

[0058] The thickness of the second sealing gasket is 3mm, and the hollow structure in the second sealing gasket has a size of 2.0×2.0cm.

[0059] The cathode substrate in the embedded sealing gasket is a graphite felt with dimensions of 35×35×3mm (length×width×thickness). The surface of the cathode substrate is a diffusion electrode layer with a thickness of 0.5mm (carbon powder with an average particle size of 30nm and polytetrafluoroethylene are mixed in a mass ratio of 5:3 to form a mixture, which is coated on the surface of the cathode substrate and then heated to 350℃ at a heating rate of 3℃ / min, and sintered at 350℃ for 1h). The cathode is embedded in the sealing gasket to obtain the cathode with embedded sealing gasket.

[0060] The cathode end plate is made of stainless steel with a thickness of 230mm. The cathode power connection terminal is set at the bottom top of the stainless steel. A square hollow structure with a side length of 2cm is set on the cathode end plate facing the cathode, and a circular hollow structure with a diameter of 2cm is set on the cathode end plate facing the air.

[0061] The anode end plate, the anode with embedded sealing gasket, the first sealing gasket, the serpentine flow channel PEek plate, the second sealing gasket, the cathode with embedded sealing gasket, and the cathode end plate are connected by screws.

[0062] Pure water was injected into the hydrogen peroxide generator at a flow rate of 0.5 mL / min through the inlet. Power was applied at 30 mA / cm². 2 50mA / cm 2 80mA / cm 2 100mA / cm 2 and 120mA / cm 2 An electrochemical reaction is carried out at a current density, and the generated hydrogen peroxide solution flows out from the outlet.

[0063] Examples 2-4

[0064] Hydrogen peroxide was prepared according to the method of Example 1, with different conditions as shown in Table 1.

[0065] Table 1. Conditions for preparing hydrogen peroxide in Examples 1-4

[0066]

[0067]

[0068] The concentration of hydrogen peroxide in the hydrogen peroxide solutions generated in Examples 1-4 was determined using potassium titanium oxalate (K2TiO(C2O4)2), and the results are listed in Table 2. The titanium reagent formed an orange-yellow titanium(IV)-peroxide complex with H2O2, and the color depth was directly proportional to the H2O2 concentration. The absorbance was measured using a UV-Vis spectrophotometer at a wavelength of 400 nm.

[0069] Table 2 Concentrations of hydrogen peroxide solutions prepared in Examples 1-4

[0070]

[0071] Based on Table 2, a dotted-line comparison graph was plotted to show the concentrations of hydrogen peroxide solutions prepared at different current densities, as follows: Figure 2 As shown. (Combined with Table 2 and...) Figure 2 It can be seen that the hydrogen peroxide generator provided by the present invention can prepare a high concentration of hydrogen peroxide solution in a short time (instantaneous generation of H2O2).

[0072] This invention effectively regulates the concentration of hydrogen peroxide generated in the reaction system by controlling the thickness of the serpentine channel PEek plate and the pure water flow rate, and coordinating the current density. Experimental results show that, under the same flow rate conditions, increasing the thickness of the serpentine channel PEek plate leads to an increase in the electrode distance between the cathode and anode, thereby increasing the concentration of hydrogen peroxide generated. Under the same serpentine channel PEek plate thickness conditions, decreasing the flow rate prolongs the reaction time, which also helps to increase the concentration of hydrogen peroxide generated. At a flow rate of 0.5 mL / min and a serpentine channel PEek plate thickness of 4 mm, a maximum instantaneous hydrogen peroxide concentration of 8200 ppm can be generated. These experimental results verify, from an engineering perspective, the basic principle of efficient synthesis achieved through the integrated channel-electrode design of the hydrogen peroxide generator provided by this invention. Its simple solid-state electrolyte architecture completely avoids the complex desalination and purification steps in traditional processes.

[0073] The conductivity of hydrogen peroxide prepared in Examples 1-4 was tested, and the results are listed in Table 3. The conductivity of pure water was tested under the same conditions, and the results showed that the conductivity of pure water was 2.01 μS / cm.

[0074] Table 3. Conductivity of hydrogen peroxide solutions prepared in Examples 1-4

[0075]

[0076]

[0077] The conductivity test results show that the conductivity of the hydrogen peroxide solution prepared at different current densities was not significantly higher than that of pure water, indicating that no significant increase in ion concentration was detected in the hydrogen peroxide solution. This suggests that no salt byproducts were generated during the preparation of the hydrogen peroxide solution.

[0078] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A hydrogen peroxide generator, characterized in that, It includes a positive end plate, an anode with an embedded sealing gasket, a first sealing gasket, a serpentine flow channel insulating plate, a second sealing gasket, a cathode with an embedded sealing gasket, and a negative end plate stacked in sequence; the serpentine flow channel insulating plate is filled with ion exchange resin in its serpentine flow channel. The top of the anode and cathode end plates are provided with power connection terminals; The anode end plate, the anode with embedded sealing gasket, the first sealing gasket, and the surface of the serpentine flow channel insulating plate are provided with an inlet and an outlet. The inlet is connected to one end of the serpentine flow channel in the serpentine flow channel insulating plate, and the outlet is connected to the other end of the serpentine channel in the serpentine flow channel insulating plate.

2. The hydrogen peroxide generator according to claim 1, characterized in that, The anode includes an anode substrate and an anode active layer disposed on the surface of the anode substrate; The anode substrate is titanium, and the composition of the anode active layer includes an iridium-tantalum mixture and / or cobalt oxide; The thickness of the anode substrate is 0.8–1.2 mm, and the thickness of the anode active layer is 9–11 μm.

3. The hydrogen peroxide generator according to claim 1, characterized in that, The cathode includes a cathode substrate and a diffused electrode layer loaded on the surface of the cathode substrate; The cathode substrate is a conductive porous material with a thickness of 1-5 mm, and the diffusion electrode layer is obtained by sintering a mixture of carbon powder and polytetrafluoroethylene.

4. The hydrogen peroxide generator according to claim 1, characterized in that, The first sealing gasket has a hollow structure, the center of which is on the same horizontal line as the center of the anode, and the area of ​​the hollow structure is smaller than the area of ​​the anode; The thickness of the first sealing gasket is 1.8 to 2.2 mm.

5. The hydrogen peroxide generator according to claim 1, characterized in that, The second sealing gasket has a hollow structure, the center of which is on the same horizontal line as the cathode center, and the area of ​​the hollow structure is smaller than the area of ​​the cathode. The thickness of the second sealing gasket is 1.8 to 2.2 mm.

6. The hydrogen peroxide generator according to claim 1, characterized in that, The thickness of the serpentine flow channel insulation plate is 2-4 mm.

7. The hydrogen peroxide generator according to claim 1, characterized in that, The cathode and anode plates are made of metal, and their thicknesses are 220-240 mm. The negative end plate is provided with a hollow structure.

8. The hydrogen peroxide generator according to claim 1, characterized in that, The average particle size of the ion exchange resin is 50-100 mesh.

9. A method for preparing hydrogen peroxide using the hydrogen peroxide generator according to any one of claims 1 to 8, characterized in that, Includes the following steps: Water is introduced into the hydrogen peroxide generator through the inlet on the surface of the anode plate. An electrochemical reaction takes place in the chamber formed by the first sealing gasket of the anode plate, the flow channel insulating plate, the second sealing gasket, and the cathode plate. The generated hydrogen peroxide flows out through the outlet on the surface of the anode plate.

10. The method for preparing hydrogen peroxide according to claim 9, characterized in that, The current density of the electrochemical reaction is 30–300 mA / cm². 2 ; The flow rate of water introduced into the hydrogen peroxide generator is 0.1–10 mL / min.

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