Device and method for self-breathing electrochemical synthesis of hydrogen peroxide
By adopting a self-breathing oxygen supply structure and flow channel design in the electrochemical hydrogen peroxide synthesis device, the problem of insufficient dissolved oxygen in the cathode area was solved, achieving efficient and stable hydrogen peroxide generation, simplifying the device structure and reducing energy consumption.
Patent Information
- Application Number
- CN202511807138.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-02-24
AI Technical Summary
In existing electrochemical hydrogen peroxide synthesis devices, the supply of dissolved oxygen in the cathode region is insufficient, resulting in low generation efficiency and high energy consumption.
The device for synthesizing hydrogen peroxide using a self-breathing electrochemical process establishes a self-breathing oxygen supply structure by setting connecting grooves on both sides of the shell to allow the cathode electrode to directly contact the outside air. An inlet and outlet are set at the contact point between the anode electrode and the electrolyte to achieve continuous replenishment of the electrolyte and directional export of the product. At the same time, a non-conductive partition is set between the anode and cathode to form a flow channel, ensuring uniform distribution of the electrolyte and stable reaction.
The problem of insufficient dissolved oxygen at the cathode was solved, the hydrogen peroxide generation efficiency was improved, the device structure was simplified, energy consumption was reduced, and the stability of the reaction and the product collection efficiency were improved.
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Figure CN121556065A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrochemical synthesis technology, and in particular to an apparatus and method for the self-breathing electrochemical synthesis of hydrogen peroxide. Background Technology
[0002] Hydrogen peroxide (H2O2) is widely used in various fields such as biochemical disinfection, textile bleaching, papermaking and pulping, water treatment and purification, and household sterilization due to its strong oxidizing properties and environmental friendliness. Market demand is increasing year by year. With the increasing environmental protection requirements, the development of clean, efficient, and safe hydrogen peroxide preparation technology has become a research hotspot in the industry.
[0003] Currently, the main industrial method for preparing hydrogen peroxide is the anthraquinone process. This method requires multiple reaction cycles and suffers from problems such as complex solution handling and high energy consumption. Other preparation methods, such as isopropanol oxidation and direct hydrogen-oxygen synthesis, also have drawbacks such as low safety and difficulty in product separation. Electrocatalytic oxygen reduction is gradually becoming the preferred technology to replace traditional methods due to its advantages of mild reaction conditions, clean production process, and safe operation.
[0004] Regarding the aforementioned technologies, the inventors believe that most existing electrochemical hydrogen peroxide synthesis devices employ flow-through, circulation, or critical structures. The core problem with these devices is insufficient dissolved oxygen supply in the cathode region, resulting in low hydrogen peroxide generation efficiency and high energy consumption. Summary of the Invention
[0005] The purpose of this application is to provide an apparatus and method for self-breathing electrochemical synthesis of hydrogen peroxide, so as to improve the problem of insufficient dissolved oxygen supply in the cathode region, which leads to low hydrogen peroxide generation efficiency and high energy consumption.
[0006] This application provides an apparatus and method for the self-breathing electrochemical synthesis of hydrogen peroxide, which adopts the following technical solution: A device for self-breathing electrochemical synthesis of hydrogen peroxide includes a housing and a reaction tank inside the housing. Cathode electrodes are disposed on opposite sides of the reaction tank, and the cathode electrodes are in contact with the electrolyte in the reaction tank. Connecting grooves communicating with the reaction tank are provided on both sides of the housing. The cathode electrodes are fitted against the inner wall of the connecting grooves. The side of the cathode electrodes facing away from the reaction tank is in contact with the air outside the housing. A cover plate is disposed above the reaction tank on the housing. An anode electrode in contact with the electrolyte is disposed on the side of the cover plate facing the reaction tank. The cover plate has a water inlet, and the end of the housing away from the cover plate has a water outlet communicating with the reaction tank.
[0007] By adopting the above technical solution, the shell and the internal reaction tank constitute the core supporting frame of the device. The cathode electrodes on opposite sides of the reaction tank are in contact with the electrolyte to ensure the reaction interface, and the side away from the reaction tank is in direct contact with the outside air through the connecting grooves on both sides of the shell, forming a self-breathing oxygen supply structure. There is no need to configure additional oxygen storage and transportation equipment, which fundamentally solves the problem of insufficient dissolved oxygen at the cathode of traditional devices, and simplifies the overall structure of the device. The anode electrode on the cover plate is in contact with the electrolyte. With the water inlet of the cover plate and the water outlet at the bottom of the shell, the continuous replenishment of electrolyte and the directional export of products are realized. The overall structural design is compact and reasonable, providing a stable reaction system for the efficient synthesis of hydrogen peroxide, and also facilitating subsequent integration and matching with various equipment.
[0008] Optionally, a plurality of non-conductive partitions are provided between the anode electrode and the cathode electrode, and a flow channel is formed between adjacent partitions. The partitions are arranged along the width direction of the anode electrode of the reaction tank.
[0009] By adopting the above technical solution, the non-conductive partition between the anode and cathode electrodes is set along the width of the anode electrode in the reaction tank. This achieves physical isolation between the anode and cathode, effectively preventing short-circuit faults and ensuring the safe and stable operation of the reaction. Furthermore, the partitions enclose a regular flow channel, providing a directional path for the electrolyte flow. The arrangement direction of the partitions matches the width of the anode electrode, allowing the electrolyte to be evenly distributed along the electrode reaction surface, increasing the contact area between the electrolyte and the electrode, reducing dead zones, improving the reaction conversion rate, and laying a structural foundation for the rapid extraction of subsequent products.
[0010] Optionally, a pressure plate is provided on the side wall of the cathode electrode in the housing, and a hollow groove corresponding to the cathode electrode is opened in the pressure plate. A retaining groove corresponding to the pressure plate is opened on both sides of the housing.
[0011] By adopting the above technical solution, the pressure plates on both sides of the shell are precisely positioned and installed through the embedding grooves. The hollow grooves on the pressure plates correspond precisely to the cathode electrodes. While forming a stable and tight clamping limit on the cathode electrodes, it does not block the contact area between the cathode electrodes and the air, ensuring that the self-breathing oxygen supply channel is unobstructed. The detachable design of the embedding grooves makes it easy to disassemble and assemble the pressure plates, which facilitates the replacement, cleaning and maintenance of the cathode electrodes and reduces the maintenance cost of the device. At the same time, the clamping effect of the pressure plates on the cathode electrodes prevents electrode displacement caused by electrolyte flow and electrode reaction vibration during the reaction process, ensuring the stability and consistency of the electrochemical reaction.
[0012] Optionally, the partition has a fixing groove for fixing the anode electrode, and the side wall of the partition abuts against the inner side wall of the housing and the side wall of the cathode electrode.
[0013] By adopting the above technical solution, the fixing groove on the partition provides a precise installation and positioning point for the anode electrode, ensuring that the anode electrode is accurately and stably positioned in the reaction tank, preventing electrode displacement from affecting the electric field distribution during the reaction. The tight contact between the partition sidewall and the inner sidewall of the shell and the cathode electrode sidewall further enhances the integrity and sealing of the internal structure of the device, preventing electrolyte leakage. At the same time, physical contact restricts the relative displacement of each component, avoiding instability of the reaction system due to loose components. The non-conductive partition material also further blocks unintended conduction between the anode and cathode, providing double protection for reaction safety.
[0014] Optionally, the end of the partition plate is provided with a flow guide groove communicating with the flow guide channel, and the flow guide grooves of adjacent partition plate ends are staggered.
[0015] By adopting the above technical solution, the guide grooves and guide channels at the ends of the partitions are interconnected, and the guide grooves of adjacent partitions are designed in an alternating manner, which extends the flow path of the electrolyte in the reaction tank, making the contact time between the electrolyte and the electrode reaction surface more sufficient, thereby improving the raw material conversion rate and the amount of hydrogen peroxide generated. The alternating arrangement of the guide grooves can guide the electrolyte to form a uniform flow state, avoid the phenomenon of electrolyte stagnation in local areas, reduce the residence time of hydrogen peroxide in the reaction system, reduce its decomposition loss, and thus improve the product concentration and yield. At the same time, the structural design of the guide grooves also reduces the electrolyte flow resistance, ensuring the continuous and stable reaction.
[0016] Optionally, the anode electrode is arranged along the length of the reaction tank, the anode electrode is located in the middle region between two cathode electrodes, and the end of the anode electrode is in contact with the bottom of the reaction tank.
[0017] By adopting the above technical solution, the anode electrode is set along the length of the reaction tank and located in the middle area between the two cathode electrodes, so that the distance between the anode and the cathodes on both sides is kept uniform and consistent, ensuring a balanced electric field distribution and avoiding the problem of uneven reaction caused by excessively strong or weak local electric fields, making the electrochemical reaction between the anode and cathode more stable and efficient; the end of the anode electrode is in contact with the bottom of the reaction tank, ensuring that the electrolyte can completely immerse the anode reaction area, maximizing the utilization of the effective reaction area of the electrode, increasing the reaction rate per unit time, and ensuring the continuous and stable generation of hydrogen peroxide.
[0018] Optionally, the cathode electrode is any one of graphite felt, carbon paper, graphite paper, nitrided graphite felt, nitrided carbon paper, nitrided graphite paper, or nitrided graphite felt, nitrided carbon paper, or nitrided graphite paper supported with a noble metal catalyst, and the anode electrode is platinum-plated foamed titanium or fiber titanium.
[0019] By adopting the above technical solutions, the graphite felt, carbon paper, and nitrided graphite felt materials selected for the cathode electrode have excellent air diffusion performance, electrocatalytic activity, and chemical stability. In particular, the materials supporting noble metal catalysts can significantly reduce the activation energy of the two-electron oxygen reduction reaction, promote the directional reaction, and reduce the generation of by-products. The platinum-plated foamed titanium or fiber titanium materials used for the anode electrode have good conductivity, strong catalytic activity, and good corrosion resistance. They can efficiently catalyze the water oxidation reaction to generate H⁺, providing a sufficient supply of protons for the cathode reaction. The scientific matching of the two electrode materials further improves the selectivity, efficiency, and service life of hydrogen peroxide synthesis.
[0020] Optionally, the ends of the anode electrode and the cathode electrode are provided with terminals for electrical connection to the power supply, and the side wall of the housing is provided with a slot corresponding to the cathode electrode.
[0021] By adopting the above technical solution, the terminals at the ends of the anode and cathode electrodes provide a convenient and reliable interface for connecting the electrodes to the power supply, ensuring stable and smooth current transmission, avoiding problems such as fluctuations in reaction efficiency and local heating caused by poor contact, and ensuring stable energy supply during the reaction process; the slots on the side wall of the shell are precisely matched with the edge of the cathode electrode, and the mechanical fitting further enhances the installation stability of the cathode electrode, preventing gaps between the electrode and the shell during the reaction process, which would affect the self-breathing oxygen supply effect and the electrolyte sealing performance. At the same time, the slot design also simplifies the assembly process of the cathode electrode and improves the overall assembly efficiency of the device.
[0022] A method for the electrochemical synthesis of hydrogen peroxide through respiration includes the following steps: S100, inject electrolyte into the reaction tank of the shell, and input power to the cathode electrode and anode electrode through the power supply; S200, water oxidation reaction occurs at the anode electrode, using the electrolyte as a reactant to generate oxygen or hydrogen peroxide; S300, a two-electron oxygen reduction reaction occurs on the surface of the cathode electrode, using oxygen in the air as a reactant to generate hydrogen peroxide, which diffuses into the electrolyte. In S400, the electrolyte carries the generated hydrogen peroxide through a flow channel formed by adjacent partitions. The hydrogen peroxide is then guided to the outlet through staggered flow channels at the ends of the partitions, continuously discharged and collected.
[0023] A method for the self-breathing electrochemical synthesis of hydrogen peroxide also includes the following steps: S210, the reaction at the anode electrode is H2O → 0.5O2 + 2H. + +2e - Or 2H₂O → H₂O₂ + 2H + +2e - Furthermore, the electrolyte creates a slightly acidic environment by dissolving CO2 in the air; S310, the reaction at the cathode electrode is O2 + 2H2O. + +e - →H2O2, the electrolyte is a water-based salt electrolyte, specifically mineral water or dechlorinated tap water, and the collected hydrogen peroxide concentration can reach more than 30%.
[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The shell and internal reaction tank constitute the core supporting frame of the device. The cathode electrodes on opposite sides of the reaction tank are in contact with the electrolyte to ensure the reaction interface, and the side away from the reaction tank is in direct contact with the outside air through the connecting grooves on both sides of the shell, forming a self-breathing oxygen supply structure. There is no need to configure additional oxygen storage and transportation equipment, which fundamentally solves the problem of insufficient dissolved oxygen at the cathode of traditional devices, and simplifies the overall structure of the device. The anode electrode on the cover plate is in contact with the electrolyte. With the water inlet of the cover plate and the water outlet at the bottom of the shell, the electrolyte is continuously replenished and the product is directed out. The overall structure is compact and reasonable, providing a stable reaction system for the efficient synthesis of hydrogen peroxide, and also facilitating subsequent integration with various equipment. 2. The non-conductive partition between the anode and cathode electrodes is set along the width of the anode electrode in the reaction tank. This achieves physical isolation between the anode and cathode, effectively preventing short-circuit faults and ensuring the safe and stable operation of the reaction. It also forms a regular flow channel through the enclosed partitions, providing a directional path for the electrolyte flow. The arrangement direction of the partitions matches the width of the anode electrode, allowing the electrolyte to be evenly distributed along the electrode reaction surface, increasing the contact area between the electrolyte and the electrode, reducing dead zones in the reaction, improving the reaction conversion rate, and laying a structural foundation for the rapid extraction of subsequent products. 3. The pressure plates on both sides of the shell are precisely positioned and installed through the embedding grooves. The hollow grooves on the pressure plates correspond precisely to the cathode electrodes. While forming a stable and tight clamping limit on the cathode electrodes, it does not block the contact area between the cathode electrodes and the air, ensuring that the self-breathing oxygen supply channel is unobstructed. The detachable design of the embedding grooves makes it easy to disassemble and assemble the pressure plates, which facilitates the replacement, cleaning and maintenance of the cathode electrodes and reduces the maintenance cost of the device. At the same time, the clamping effect of the pressure plates on the cathode electrodes prevents electrode displacement caused by electrolyte flow and electrode reaction vibration during the reaction process, ensuring the stability and consistency of the electrochemical reaction. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of an apparatus for the self-breathing electrochemical synthesis of hydrogen peroxide. Figure 2 This is a partial schematic diagram of a device for the self-breathing electrochemical synthesis of hydrogen peroxide; Figure 3 yes Figure 2 A magnified view of part A in the middle.
[0026] In the diagram, 1 is the shell; 11 is the reaction tank; 13 is the outlet; 14 is the connecting groove; 15 is the embedding groove; 16 is the slot; 2 is the cathode electrode; 3 is the cover plate; 31 is the inlet; 4 is the anode electrode; 5 is the partition plate; 51 is the flow guiding channel; 52 is the fixing groove; 53 is the flow guiding groove; 6 is the pressure plate; 61 is the hollow groove; and 7 is the wiring terminal. Detailed Implementation
[0027] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail below. Example
[0028] A device for the self-breathing electrochemical synthesis of hydrogen peroxide, referring to Figure 1 and Figure 2 The device includes a housing 1, which is integrally formed from an insulating material resistant to electrolyte corrosion. A cuboid reaction tank 11 is formed inside the housing 1. The size of the reaction tank 11 can be designed according to the actual application requirements. Symmetrical connecting grooves 14 are formed on opposite side walls of the housing 1, which are connected to the reaction tank 11. The shape and size of the connecting grooves 14 are completely adapted to the cathode electrode 2, ensuring that the cathode electrode 2 can be tightly attached to the inner side wall of the connecting grooves 14. The cathode electrode 2 is made of any one of the following materials: graphite felt, carbon paper, graphite paper, nitrided graphite felt, carbon nitride, nitrided graphite paper, or nitrided graphite felt, carbon nitride, or nitrided graphite paper loaded with a noble metal catalyst. The inner side wall of the cathode electrode 2 is in contact with the electrolyte in the reaction tank 11, and the outer side wall of the cathode electrode 2 is directly exposed to the air outside the housing 1, forming a self-breathing contact structure.
[0029] Reference Figure 2 and Figure 3 An embedding groove 15 is provided on the outer edge of the corresponding connecting groove 14 on both sides of the housing 1. The pressure plate 6 is made of insulating material that is the same as that of the housing 1. It is snapped onto the housing 1 through the embedding groove 15. A hollow groove 61 with the same size as the cathode electrode 2 is provided in the middle of the pressure plate 6. When the pressure plate 6 is installed in place, the hollow groove 61 is completely aligned with the cathode electrode 2, ensuring that the contact between the cathode electrode 2 and the air is not blocked. At the same time, the pressure plate 6 forms a uniform pressing force on the cathode electrode 2.
[0030] Reference Figure 2 and Figure 3The housing 1 is located above the reaction tank 11 and is equipped with a cover plate 3. The cover plate 3 on the top of the housing 1 can be sealed to the housing 1 with sealant. The side of the cover plate 3 facing the reaction tank 11 has a reserved anode mounting position. The anode electrode 4 is made of platinum-plated foam titanium or fiber titanium and is fixedly installed on the cover plate 3 along the length of the reaction tank 11. The lower end of the anode electrode 4 extends into the reaction tank 11 and is located in the middle area between the two cathode electrodes 2. The lower end of the anode electrode 4 is in close contact with the bottom of the reaction tank 11 to ensure that it is completely immersed in the electrolyte.
[0031] Reference Figure 2 and Figure 3 The reaction tank 11 contains several non-conductive baffles 5, which are arranged parallel to the width of the anode electrode 4. Each baffle 5 has a fixing groove 52 adapted to the anode electrode 4, allowing the anode electrode 4 to be precisely positioned within the fixing groove 52. The two side walls of each baffle 5 are in close contact with the inner wall of the housing 1 and the inner wall of the cathode electrode 2, respectively. Uniformly distributed flow channels 51 are formed between adjacent baffles 5. A flow channel 53 communicating with the flow channel 51 is provided at the lower end of each baffle 5. The flow channels 53 at the ends of adjacent baffles 5 are arranged in a staggered pattern to ensure that the electrolyte in the flow channel 51 can smoothly converge to the outlet 13.
[0032] Reference Figure 2 and Figure 3 The cover plate 3 is integrally formed with a water inlet 31 to facilitate the uniform flow of electrolyte. The bottom of the shell 1 away from the cover plate 3 has a water outlet 13, which is connected to the inside of the reaction tank 11 to discharge the electrolyte containing hydrogen peroxide. The upper ends of the anode electrode 4 and the cathode electrode 2 extend to the outside of the cover plate 3. The ends of the anode electrode 4 and the cathode electrode 2 are welded with metal terminals 7, which can be connected to the positive and negative terminals of an external power supply through wires. The side wall of the shell 1 has a slot 16 corresponding to the edge of the cathode electrode 2. The edge of the cathode electrode 2 is embedded in the slot 16 to further improve the installation stability. The electrolyte is dechlorinated tap water, which is injected into the reaction tank 11 to completely submerge the reaction areas of the anode electrode 4 and the cathode electrode 2. Example
[0033] A method for the electrochemical synthesis of hydrogen peroxide through respiration includes the following steps: S100, inject electrolyte into the reaction tank 11 of the shell 1, and input power to the cathode electrode 2 and anode electrode 4 through the power supply; S200, water oxidation reaction occurs at the anode electrode 4, using the electrolyte as a reactant to generate oxygen or hydrogen peroxide; S210, the reaction at anode electrode 4 is H2O → 0.5O2 + 2H + +2e - Or 2H₂O → H₂O₂ + 2H+ +2e - Furthermore, the electrolyte creates a slightly acidic environment by dissolving CO2 in the air; S300, a two-electron oxygen reduction reaction occurs on the surface of cathode electrode 2, using oxygen in the air as a reactant to generate hydrogen peroxide, which diffuses into the electrolyte. S310, the reaction formula for cathode electrode 2 is O2 + 2H+ + +e - →H2O2, the electrolyte is a salt electrolyte with water as the carrier, specifically mineral water or dechlorinated tap water, and the collected hydrogen peroxide concentration can reach more than 30%; S400, the electrolyte carries the generated hydrogen peroxide and flows in the guide channel 51 formed by the adjacent partitions 5. It is guided to the outlet 13 by the guide grooves 53 staggered at the ends of the partitions 5, and the hydrogen peroxide is continuously discharged and collected.
[0034] The implementation principle of this application embodiment is as follows: After the device is assembled, dechlorinated tap water is injected into the reaction tank 11 as the electrolyte. During the settling process, the electrolyte naturally dissolves CO2 from the air, creating a slightly acidic environment suitable for the electrocatalytic reaction. This eliminates the need for additional acid reagents, simplifying the reaction process. The anode electrode 4 is connected to the positive terminal of the power supply via terminal 7, and the cathode electrode 2 is connected to the negative terminal. When the power is turned on, the circuit forms a closed loop, and current is transmitted through terminal 7 to the anode electrode 4 and the cathode electrode 2, creating a stable electric field environment. Under the combined action of the electric field and the electrode catalyst, a water oxidation reaction occurs on the surface of the anode electrode 4, catalytically decomposing water molecules in the electrolyte to generate H₂. + Electrons and oxygen (or hydrogen peroxide), wherein electrons flow through an external circuit to the cathode electrode 2, H + The protons diffuse from the electrolyte toward the cathode, providing a proton supply for the cathode reaction. Simultaneously, the outer side of cathode electrode 2 is in direct contact with air, and oxygen from the air diffuses through the porous structure of the cathode electrode 2 material to the inner reaction surface of the electrode. Under the action of the cathode catalyst, it reacts with H+ in the electrolyte. +Electrons from the external circuit undergo a two-electron oxygen reduction reaction, directionally generating hydrogen peroxide. Because the cathode electrode 2 employs a self-breathing structure, it can continuously obtain oxygen from the air, ensuring sufficient oxygen supply during the reaction and solving the problem of insufficient oxygen supply in traditional devices. Under the continuous replenishment of the electrolyte through the inlet 31, it flows slowly along the guide channel 51. The staggered guide grooves 53 guide the electrolyte to flow evenly across the entire electrode reaction surface, allowing the generated hydrogen peroxide to flow with the electrolyte in a timely manner, avoiding prolonged residence in the reaction tank 11 and subsequent decomposition and loss. Finally, it is continuously discharged and collected through the outlet 13. The partition 5 between the anode and cathode not only achieves physical isolation but also ensures electrode stability through structures such as the fixing groove 52 and sidewall contact, resulting in a uniform electric field distribution and further improving the stability and efficiency of the reaction, ultimately achieving the efficient and continuous synthesis of high-concentration hydrogen peroxide.
[0035] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A device for the self-breathing electrochemical synthesis of hydrogen peroxide, characterized in that: The device includes a housing (1) and a reaction tank (11) inside the housing (1). Cathode electrodes (2) are provided on opposite sides of the reaction tank (11) of the housing (1). The cathode electrodes (2) are in contact with the electrolyte in the reaction tank (11). A connecting groove (14) communicating with the reaction tank (11) is provided on both sides of the housing (1). The cathode electrodes (2) are attached to the inner wall of the connecting groove (14). The side of the cathode electrodes (2) away from the reaction tank (11) is in contact with the air outside the housing (1). A cover plate (3) is provided above the reaction tank (11) of the housing (1). An anode electrode (4) in contact with the electrolyte is provided on the side of the cover plate (3) facing the reaction tank (11). A water inlet (31) is provided on the cover plate (3). A water outlet (13) communicating with the reaction tank (11) is provided at the end of the housing (1) away from the cover plate (3).
2. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 1, characterized in that: A plurality of non-conductive partitions (5) are provided between the anode electrode (4) and the cathode electrode (2), and a flow channel (51) is formed between adjacent partitions (5). The partitions (5) are arranged along the width direction of the anode electrode (4) of the reaction tank (11).
3. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 2, characterized in that: The housing (1) is provided with a pressure plate (6) on the side wall of the cathode electrode (2). The pressure plate (6) has a hollow groove (61) corresponding to the cathode electrode (2). The housing (1) has a fixing groove (15) corresponding to the pressure plate (6) on both sides.
4. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 3, characterized in that: The partition (5) has a fixing groove (52) for fixing the anode electrode (4), and the side wall of the partition (5) abuts against the inner side wall of the shell (1) and the side wall of the cathode electrode (2).
5. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 4, characterized in that: The partition (5) has a flow channel (53) at its end that communicates with the flow channel (51), and the flow channels (53) at adjacent ends of the partition (5) are staggered.
6. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 5, characterized in that: The anode electrode (4) is arranged along the length of the reaction tank (11). The anode electrode (4) is located in the middle region between the two cathode electrodes (2), and the end of the anode electrode (4) is in contact with the bottom of the reaction tank (11).
7. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 6, characterized in that: The cathode electrode (2) is any one of graphite felt, carbon paper, graphite paper, nitrided graphite felt, nitrided carbon paper, nitrided graphite paper or nitrided graphite felt, nitrided carbon paper, nitrided graphite paper or nitrided graphite paper loaded with a noble metal catalyst, and the anode electrode (4) is platinum-plated foamed titanium or fiber titanium.
8. The apparatus for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 7, characterized in that: The anode electrode (4) and cathode electrode (2) are provided with terminals (7) that are electrically connected to the power supply, and the side wall of the housing (1) is provided with a slot (16) corresponding to the cathode electrode (2).
9. A method for the electrochemical synthesis of hydrogen peroxide through self-breathing, characterized in that: An apparatus for the self-breathing electrochemical synthesis of hydrogen peroxide according to any one of claims 1-8. S100, inject electrolyte into the reaction tank (11) of the shell (1), and input power to the cathode electrode (2) and anode electrode (4) through the power supply; S200, the anode electrode (4) undergoes a water oxidation reaction, using the electrolyte as a reactant to generate oxygen or hydrogen peroxide; S300, a two-electron oxygen reduction reaction occurs on the surface of the cathode electrode (2), using oxygen in the air as a reactant to generate hydrogen peroxide, which diffuses into the electrolyte; S400, the electrolyte carries the generated hydrogen peroxide and flows in the guide channel (51) formed by the adjacent partitions (5), and is guided to the outlet (13) by the guide grooves (53) staggered at the ends of the partitions (5), and the hydrogen peroxide is continuously discharged and collected.
10. The method for self-breathing electrochemical synthesis of hydrogen peroxide according to claim 9, characterized in that: S210, the reaction at the anode electrode (4) is H2O → 0.5O2 + 2H + +2e - Or 2H₂O → H₂O₂ + 2H + +2e - Furthermore, the electrolyte creates a slightly acidic environment by dissolving CO2 in the air; S310, the reaction formula of cathode electrode (2) is O2 + 2H + +e - →H2O2, the electrolyte is a water-based salt electrolyte, specifically mineral water or dechlorinated tap water, and the collected hydrogen peroxide concentration can reach more than 30%.