Electrochemical active oxygen supply device for washing machine and preparation method

Abstract

The invention provides an electrochemical active oxygen supply device for a washing machine and a preparation method. The device comprises a shell, a single closed reaction chamber is formed in the shell, a bifunctional anode electrode and a bifunctional cathode electrode are integrated in the reaction chamber, and a compact and uniform reaction area is formed between the anode electrode and the cathode electrode. When water flows through the reaction area, hydrogen peroxide (H2O2) and / or hydroxyl radicals (OH) are / is electrochemically generated on the surface in situ by accurately adjusting the electrode potential of the difunctional anode, so that instant generation and instant utilization of active oxygen are realized. The active oxygen directly enters a washing system of the washing machine along with water flow, bacteria, viruses and fungi can be efficiently inactivated under the normal-temperature or low-temperature washing condition without additionally adding chemical disinfectants, organic stains and peculiar smell molecules are synchronously degraded, and green, efficient and intelligent healthy washing is achieved.

Description

TECHNICAL FIELD The present application relates to the technical field of water treatment for washing machines, and in particular to an electrochemically active oxygen supply device for washing machines and a preparation method thereof. BACKGROUND With the increasing demand of consumers for laundry care and healthy washing, modern washing machines are generally integrated with sterilization functions, aiming to kill or inhibit microorganisms such as bacteria, viruses, fungi and the like attached to clothes through physical, chemical or biological means.

[0001] At present, common sterilization technologies for washing machines include high-temperature sterilization, ultraviolet (UV) sterilization, ozone (O3) sterilization and silver ion (Ag + ) sterilization, etc. However, these technologies each have obvious limitations: high-temperature washing has reliable sterilization effect, but has high energy consumption and is easy to damage fabric fibers; ultraviolet has weak penetration and is difficult to cover the creases or stacked areas of clothes, thus having a sterilization blind area; ozone has strong oxidizing property and can achieve normal-temperature sterilization, but has a stimulating odor and has a risk of corrosion to internal components such as rubber and plastic of the washing machine; silver ion has long-lasting effect, but its release rate is difficult to control and has environmental accumulation risk, which may cause ecological toxicity problems.

[0002] To break through the above bottlenecks, research in recent years has focused on green sterilization paths based on active oxygen, especially the use of electrochemical methods to generate hydrogen peroxide (H2O2) or hydroxyl radicals (•OH) and other highly active substances in situ. Such substances have strong oxidizing ability and harmless decomposition products only water and oxygen, and can achieve efficient sterilization and stain removal at low temperatures. However, existing electrochemical active oxygen generation technologies are mostly limited to the generation of a single active species, and the related devices are usually independent external equipment outside the washing machine system, resulting in low overall integration, large space occupation and complex operation. At the same time, during the transportation of active oxygen from the generation device to the washing chamber, it is easy to be significantly lost due to decomposition, side reactions or transmission delay, resulting in insufficient effective concentration actually reaching the surface of the clothes, significantly reducing the sterilization and stain removal efficiency. SUMMARY The purpose of the present application is to provide an electrochemically active oxygen supply device for washing machines, which solves the problems of high energy consumption, low efficiency, chemical residues and safety hazards existing in current high-temperature, ultraviolet, ozone and silver ion sterilization technologies.

[0003] The present application is realized by the following technical solutions: An electrochemically active oxygen supply device for washing machines, comprising a shell for water flow, a cathode electrode and a bifunctional anode electrode are arranged in the shell, and a reaction zone for electrochemistry is formed between the bifunctional anode electrode and the cathode electrode. When water flows through the reaction zone, hydrogen peroxide and / or hydroxyl radicals are generated on the surface of the bifunctional anode electrode by controlling the potential of the bifunctional anode electrode.

[0004] The electrochemically active oxygen supply device for washing machine, the dual-function anode electrode is a titanium-based electrode with a boron-doped diamond coating or a tin-antimony oxide coating.

[0005] The electrochemically active oxygen supply device for washing machine, the thickness of the boron-doped diamond coating and the tin-antimony oxide coating is 0.5-20 μm.

[0006] The electrochemically active oxygen supply device for washing machine, the cathode electrode is a gas diffusion electrode composed of a gas diffusion layer and a selective catalytic layer.

[0007] The electrochemically active oxygen supply device for washing machine, the cathode electrode is provided with a plurality of liquid flow holes for increasing the contact area between water and the electrode.

[0008] The electrochemically active oxygen supply device for washing machine, the distance between the cathode electrode and the dual-function anode electrode is 1-3 mm.

[0009] The electrochemically active oxygen supply device for washing machine, the shell comprises a first shell and a second shell for fixing the electrodes, a reaction chamber for water flow is formed between the first shell and the second shell, and the first shell is provided with a water inlet and a water outlet communicating with the reaction chamber.

[0010] The electrochemically active oxygen supply device for washing machine, the first shell is provided with a first limiting block and a second limiting block for fixing the electrodes, and the second shell is provided with a first limiting hole and a second limiting hole for fixing the electrodes.

[0011] The electrochemically active oxygen supply device for washing machine, the cathode electrode and the dual-function anode electrode are respectively electrically connected to an external power source through an electrical connection assembly, and the cathode electrode, the dual-function anode electrode and the electrical connection assembly are fixed in the second shell through a sealing element.

[0012] Another object of the present application is to provide a preparation method of electrochemically active oxygen for washing machine, which adopts the electrochemically active oxygen supply device for washing machine, and comprises the following steps: S1, the cathode electrode and the dual-function anode electrode are respectively connected to the negative electrode and the positive electrode of an external power source through the electrical connection assembly, forming an electrochemical loop; S2, when water flows through the reaction chamber from the water inlet, a multi-channel constant potential instrument is used to control the potential of the dual-function anode electrode, so that hydrogen peroxide and / or hydroxyl radicals are generated on the surface of the dual-function anode electrode, forming an active oxygen treatment solution containing hydrogen peroxide and / or hydroxyl radicals, which flows out of the reaction chamber through the water outlet.

[0013] The beneficial effects of the present application are as follows: The present application provides an electrochemically active oxygen supply device for a washing machine. First, a single sealed reaction chamber is formed inside the housing, providing a safe and isolated place for electrochemical reaction. The reaction chamber integrates a dual-function anode electrode and a cathode electrode, which are respectively connected to the positive and negative poles of an external power source, forming a complete electrochemical circuit. The device can be directly connected to the water inlet of the washing machine, realizing the integration of the active oxygen generation unit and the washing machine water circuit. This compact structure design is easy to install, effectively avoids the additional pipelines, interfaces and control systems required by external generation devices, and significantly reduces system complexity and active oxygen transmission loss. Second, a compact reaction zone is formed between the dual-function anode electrode and the cathode electrode. When water flows through the reaction zone, a specific working potential is applied to the dual-function anode electrode under constant potential control, causing in-situ electrochemical generation of hydrogen peroxide (H2O2) and / or hydroxyl radicals (•OH) on its surface. By precisely controlling the potential, the type of active oxygen can be selected as needed, realizing the immediate generation and immediate use of active oxygen, fully utilizing the stable oxidation of H2O2 and the transient strong oxidation ability of •OH, and synergistically improving the bactericidal efficiency and stain removal performance under normal or low temperature conditions.

[0014] The present application also provides a method for preparing electrochemically active oxygen for a washing machine. Based on the single-chamber compact multifunctional electrochemically active oxygen supply device, the potential of the dual-function anode electrode and the cathode electrode is precisely and independently controlled, realizing the collaborative generation of active oxygen through multiple paths, and coupling and synergizing at the electrochemical level to achieve the immediate generation and immediate use of active oxygen. The generated active oxygen can directly enter the washing machine washing system (such as the inner drum) with the water flow, and under normal or low temperature washing conditions, without the need for additional chemical disinfectants, it can efficiently inactivate bacteria, viruses and fungi, and simultaneously degrade organic stains and odor molecules. BRIEF DESCRIPTION OF DRAWINGS Figure 1 is a perspective view of the structure of the present application; Figure 2 is a front view of the structure of the present application; Figure 3 is Figure 2 A-A sectional view; Figure 4 is an exploded view of the structure of the present application Figure 1 ; Figure 5 is an exploded view of the structure of the present application Figure 2 ; Figure 6 is an exploded view of the structure of the present application Figure 3 ; Figure 7 is Figure 4 an enlarged schematic view of B; Figure 8 for Figure 6 Enlarged view at point C; Figure 9 This is a schematic diagram illustrating the relationship between hydrogen peroxide concentration and time according to the present invention. Figure 10 This is a schematic diagram illustrating the relationship between the concentration of hydroxyl radicals and time according to the present invention. Detailed Implementation like Figures 1 to 8 An electrochemical active oxygen supply device for a washing machine is shown, comprising a housing 1 for water flow, wherein a cathode electrode 2 and a bifunctional anode electrode 3 are provided in the housing 1, and a reaction zone 4 for electrochemical reaction is formed between the bifunctional anode electrode 3 and the cathode electrode 2. When water flows through the reaction zone 4, hydrogen peroxide and / or hydroxyl radicals are generated on the surface of the bifunctional anode electrode 3 by controlling the potential of the bifunctional anode electrode 3.

[0015] This invention relates to an electrochemical active oxygen supply device for washing machines. The device's casing forms a single, sealed reaction chamber, providing a safe and isolated environment for the electrochemical reaction. This reaction chamber integrates a dual-function anode electrode and a cathode electrode, which are respectively connected to the positive and negative terminals of an external power supply, forming a complete electrochemical circuit. The device can be directly connected to the washing machine's water inlet, achieving integrated operation of the active oxygen generation unit and the washing machine's water circuit. This compact design facilitates installation and effectively avoids the additional piping, interfaces, and control systems required by external generators, significantly reducing system complexity and active oxygen transmission loss. Secondly, a compact reaction zone is formed between the dual-function anode and cathode electrodes. When water flows through this zone, a specific working potential is applied to the dual-function anode electrode under constant potential control, causing in-situ electrochemical generation of hydrogen peroxide (H2O2) and / or hydroxyl radicals (•OH) on its surface. By precisely controlling the potential and selecting the appropriate type of active oxygen as needed, the device achieves immediate generation and utilization of active oxygen, fully leveraging the stable oxidizing properties of H2O2 and the instantaneous strong oxidizing power of •OH, synergistically improving sterilization efficiency and detergency under low or normal temperature conditions.

[0016] Specifically, during the electrochemical reaction, a two-electron oxygen reduction reaction (2e) occurs at the cathode surface. - ORR): O2+2H + +2e - →H2O2; The surface of a bifunctional anode can be classified into the following two cases under different potential conditions: a) When a relatively low potential is applied, a two-electron water oxidation reaction (2e) occurs. - WOR), to generate hydrogen peroxide: 2H2O→H2O2+2H + +2e - ; b) When a certain (impulse) potential is applied, a hydrogen peroxide activation reaction occurs to generate hydroxyl radicals: H2O2 + e - → •OH + OH - ; and / or a water oxidation reaction occurs directly to generate hydroxyl radicals: H2O → •OH + H + + e - .

[0017] Among them, hydrogen peroxide (H2O2) is a green disinfectant, and its decomposition products are only water and oxygen, without secondary pollution or harmful residues. Hydroxyl radicals (•OH) have strong oxidizing ability and can non-selectively and efficiently degrade organic stains and inactivate bacteria, viruses and other microorganisms.

[0018] The application efficiently utilizes dissolved oxygen in water or oxygen in air through the cathode to generate H2O2 in situ by electrochemistry; at the same time, through the precise potential regulation of the bifunctional anode, on the one hand, it can directly oxidize water to generate •OH, and on the other hand, it can efficiently activate the generated H2O2 to further produce •OH with stronger activity, realizing the multi-path generation mechanism on the surface of a single electrode. H2O2 and •OH form active oxygen treatment liquid, which is generated and acts on the surface of clothes in the washing water flow, and is dispersed dynamically with the water flow in the form of microbubbles or dissolved state, and penetrates into the areas such as the gaps of clothes fibers and the dead corners of the drum which are difficult to reach by traditional technologies. In addition, the device can continuously operate in the whole cycle of washing, rinsing and soaking, and by adjusting the electrode potential, the real-time dynamic control of the active oxygen generation intensity can be realized, and the bactericidal efficiency and stain removal performance under normal temperature or low temperature conditions can be effectively improved.

[0019] Further, the bifunctional anode electrode 3 is a titanium-based electrode with a boron-doped diamond coating or a tin-antimony oxide coating.

[0020] Among them, the bifunctional anode electrode 3 is provided with a positive plug 31 for connecting an external power supply.

[0021] The bifunctional anode adopts titanium (Ti) as an electrode substrate, and the surface of the titanium is modified with a boron-doped diamond (BDD) coating or a tin-antimony oxide (Sb-SnO2) coating, so as to endow the single anode electrode with a dual-function characteristic. The titanium substrate has excellent chemical stability and corrosion resistance, and can spontaneously form a dense titanium dioxide (TiO2) passivation film under water environment and strong oxidizing electrochemical conditions, effectively resisting corrosion and protecting the long-term integrity of the electrode structure. At the same time, the titanium substrate has good electrical conductivity and mechanical strength, which can not only efficiently conduct current to drive electrochemical reactions, but also provide stable support for the surface coating to avoid deformation or coating peeling during water flow impact or assembly process. The BDD coating or the Sb-SnO2 coating on the surface of the titanium substrate endows the anode with high oxygen evolution overpotential and excellent electrocatalytic activity. Through the synergistic effect of the titanium substrate and the functional coating, the bifunctional anode can not only be operated stably for a long time, but also accurately regulate the generation path and intensity of ·OH through potential, and cooperate with H2O2 generated by the cathode to jointly build an active oxygen output mode that can be switched as needed, so as to flexibly meet the decontamination and sterilization needs of the washing machine in different scenarios such as daily washing and deep sterilization.

[0022] Further, the thickness of the boron-doped diamond coating and the tin-antimony oxide coating is 0.5-20 μm.

[0023] The bifunctional anode of the application can ensure efficient and stable electrochemical generation of active oxygen by optimizing the thickness of the coating. If the thickness is less than 0.5 μm, the coating will be incomplete, the active sites will be insufficient, or the coating will be easily worn out and the service life will be shortened. If the thickness is greater than 20 μm, the electrical resistance in the coating will increase, which will affect the electrical conductivity, or the stress will be too large and the coating will fall off, thereby reducing the catalytic efficiency and stability.

[0024] Further, the cathode electrode 2 is a gas diffusion electrode composed of a gas diffusion layer and a selective catalytic layer.

[0025] The cathode electrode 2 is provided with a negative tab 22 for connecting an external power source.

[0026] The cathode electrode of the application is a gas diffusion electrode, which adopts a hydrophobic carbon paper as a gas diffusion layer, and the surface of the carbon paper is loaded with a selective catalytic layer. The catalytic layer adopts a non-noble metal material (such as boron-nitrogen co-doped mesoporous carbon, carbon nanotube, etc.) that promotes a two-electron oxygen reduction reaction (2e - ORR). A hydrophobic and breathable resin (such as polytetrafluoroethylene) is also incorporated, and after secondary sintering, a micrometer-scale porous channel is formed, which constructs a stable gas-liquid-solid three-phase reaction interface, significantly improves the oxygen mass transfer efficiency, effectively inhibits the hydrogen evolution and other competitive side reactions, reduces the invalid energy consumption, and ensures the high efficiency and selectivity of the catalytic reaction.

[0027] Further, the cathode electrode 2 is provided with a plurality of liquid flow holes 21 for increasing the contact area between water and the electrode.

[0028] The liquid flow holes of the present application can guide water flow to penetrate the electrode structure more evenly, significantly improve the contact efficiency of water flow with the surface of the cathode and anode electrodes, make full use of the catalytic active area of the electrode, and thus improve the generation rate of active oxygen. At the same time, the liquid flow holes induce local turbulence of water flow, strengthen the mass transfer of reactants (such as dissolved oxygen) to the electrode surface, and accelerate the diffusion of products (such as H2O2) away, effectively alleviate the concentration polarization phenomenon, and further improve the efficiency of electrochemical reaction.

[0029] Further, the distance between the cathode electrode 2 and the bifunctional anode electrode 3 is 1-3 mm.

[0030] The distance between the cathode electrode and the bifunctional anode electrode affects the electrochemical reaction rate and the mass transfer effect of water. By optimizing the distance between the electrodes, the present application can significantly reduce the internal resistance of the reaction chamber, reduce energy consumption, shorten the mass transfer path of reactants and products, improve current efficiency, reduce the residence time of H2O2 in the reaction chamber, inhibit its decomposition, and thus improve the output concentration of effective active oxygen and the system response speed.

[0031] Specifically, in the present embodiment, the distance between the cathode electrode 2 and the bifunctional anode electrode 3 is 3 mm, and the areas of the two are the same, which can meet the demand of efficient electrochemical reaction and has good anti-clogging ability, and is suitable for complex water quality environment of household washing machines.

[0032] Further, the shell 1 includes a first shell 11 and a second shell 12 for fixing the electrodes, and a reaction chamber 13 for water flow communication is formed between the first shell 11 and the second shell 12, and the first shell 11 is provided with a water inlet 14 and a water outlet 15 in communication with the reaction chamber 13.

[0033] The shell of the present application adopts a single-chamber structure with split combination and integrated functions, and a closed reaction chamber is formed by assembling the first shell and the second shell, and all electrochemical reactions are completed in the chamber without the need for a diaphragm or an external reactor. The first shell is provided with a water inlet and a water outlet in communication with the reaction chamber, forming a complete water flow channel. The first shell is integrally formed by injection molding with high-strength corrosion-resistant engineering plastic (such as reinforced PP or PVDF), and the inner surface is mirror-polished (surface roughness Ra≤0.8 μm), which can significantly reduce water flow resistance and pressure drop, ensure the water inlet efficiency of the washing machine, and effectively inhibit the adsorption and heterogeneous decomposition of H2O2 and •OH on the wall, ensuring that active oxygen enters the washing process efficiently and maximizing its sterilization and stain removal efficiency.

[0034] Further, the first shell 11 is provided with a first limiting block 111 and a second limiting block 112 for fixing the electrode, and the second shell 12 is provided with a glue pouring groove 120, and the glue pouring groove 120 is provided with a first limiting hole 121 and a second limiting hole 122 for fixing the electrode.

[0035] The first limiting block 111 and the second limiting block 112 are both provided with a plurality of limiting grooves 110 for accommodating the cathode electrode 2 and the dual-function anode electrode 3.

[0036] The cathode electrode and the dual-function anode electrode are respectively arranged in the corresponding limiting grooves, then the negative tab is inserted into the first limiting hole, and the positive tab is inserted into the second limiting hole, so that the two electrodes can be fixed in the reaction chamber, and the cover plate and the shell are connected in a high-strength sealing manner through the ultrasonic welding process.

[0037] Further, the cathode electrode 2 and the dual-function anode electrode 3 are electrically connected to the external power supply through the electrical connection assembly 5; and the cathode electrode 2, the dual-function anode electrode 3 and the electrical connection assembly 5 are fixed in the second shell 12 through the sealing element 6.

[0038] The electrical connection assembly 5 includes two spring insertion terminals 51, a wire 52, a plastic terminal 53, and a heat shrink sleeve 54 covering the outer surface of the wire 52. The two spring insertion terminals 51 are respectively electrically connected to the negative tab 21 and the positive tab 31 to realize reliable conduction with the external power supply. After assembly is completed, special sealing glue is injected at the wire harness leading part area, and the sealing element 6 is formed after curing, thereby ensuring long-term sealing safety and electrical insulation reliability of the shell under the conditions of frequent water inflow, high humidity and vibration of the washing machine.

[0039] A preparation method of electrochemically active oxygen for a washing machine and a supply device of the electrochemically active oxygen for the washing machine, comprising the following steps: S1, the cathode electrode 2 and the dual-function anode electrode 3 are connected to the negative and positive poles of the external power supply through the electrical connection assembly 5, respectively, to form an electrochemical loop; S2, when water flows from the water inlet 14 through the reaction chamber 13, a multi-channel constant potential instrument is used to control the potential of the dual-function anode electrode 3, so that hydrogen peroxide and / or hydroxyl radicals are generated on the surface of the dual-function anode electrode 3, to form an active oxygen treatment liquid containing hydrogen peroxide and / or hydroxyl radicals, which flows out of the reaction chamber 13 through the water outlet 15.

[0040] This invention discloses a method for preparing electrochemical active oxygen for washing machines. Based on a compact, multi-functional electrochemical active oxygen supply device with a single chamber, it employs a constant voltage / constant current mode driven by the washing process signal. By precisely adjusting external power supply parameters, it controls the potentials of the dual-function anode and cathode electrodes, achieving multi-path synergistic generation of active oxygen. This is coupled and synergistically at the electrochemical level, enabling the immediate generation and utilization of active oxygen. The generated active oxygen can directly enter the washing machine drum with the water flow. Under normal temperature or low temperature washing conditions, it can efficiently inactivate bacteria, viruses, and fungi without the need for additional chemical disinfectants, and simultaneously degrade organic stains and odor molecules.

[0041] The performance of the electrochemical active oxygen supply device for the washing machine was tested under the following conditions: Hydrogen peroxide concentration test: 25L of tap water (pH=7.2, total dissolved solids TDS=150ppm) was placed in an external test water tank and pumped into the electrochemical active oxygen supply device at a flow rate of 12L / min. The bifunctional anode and cathode of the device were connected to the positive and negative terminals of an external power supply, respectively. A multi-channel potentiostat was used to control the electrode potential, and the power supply provided 12V DC power. After the water flow stabilized, the sample after one flow was collected at the outlet, and hydrogen peroxide (H2O2) was determined using the N,N-diethyl-p-phenylenediamine spectrophotometric method.

[0042] Table 1 Hydrogen peroxide concentration test

[0043] Hydroxyl radical concentration test: 25L of tap water (pH=7.2, total dissolved solids TDS=150ppm) was placed in an external test tank and pumped into the electrochemical active oxygen supply device at a flow rate of 12L / min. The bifunctional anode and cathode of the device were connected to the positive and negative terminals of an external power supply, respectively. A multi-channel potentiostat was used to control the electrode potential, and the power supply provided 12V DC power. After the water flow stabilized, the sample after one flow was collected at the outlet. The hydroxyl radicals (·OH) were quantitatively analyzed using electron spin resonance (ESR) combined with DMPO spin trapping technology.

[0044] Table 2 Hydroxyl radical concentration test

[0045] like Figure 9 As shown, after tap water undergoes one pass through the electrochemical active oxygen supply device, the treated liquid sample collected at the outlet has an H2O2 concentration of 3 mg / L. Figure 10 As shown, after tap water passes through the electrochemical active oxygen supply device once, the treated liquid sample collected at the outlet has an OH concentration of 7 μmol / L. Under simulated actual use conditions, the device's operating life can reach 1000 hours.

[0046] The results show that the electrochemically active oxygen supply device can generate H2O2 and high-activity transient oxidative species ·OH with sustained oxidation ability simultaneously under normal temperature / low temperature and without chemical addition. The two can form active oxygen treatment liquid in cooperation, and the concentration level thereof can meet the sterilization and stain removal requirements in the household washing scene. The active oxygen treatment liquid can efficiently degrade organic stains such as proteins and oils and odor molecules, significantly improve the cleaning efficiency, and has a significant killing effect on the high-resistance biological indicator, i.e., Bacillus subtilis var. niger spores.

[0047] The above only further illustrates the technical content of the present application by way of examples, so as to make it easier for the reader to understand, but does not represent that the embodiments of the present application are limited to this. Any technical extension or re-creation made according to the present application is protected by the present application. The protection scope of the present application is subject to the claims.

Claims

1. A device for supplying electrochemical active oxygen for a washing machine, comprising a housing (1) for water flow, characterized in that: The housing (1) is provided with a cathode electrode (2) and a bifunctional anode electrode (3). A reaction zone (4) for electrochemical reaction is formed between the bifunctional anode electrode (3) and the cathode electrode (2). When water flows through the reaction zone (4), hydrogen peroxide and / or hydroxyl radicals are generated on the surface of the bifunctional anode electrode (3) by controlling the potential of the bifunctional anode electrode (3).

2. The electrochemical active oxygen supply device for washing machines according to claim 1, characterized in that: The dual-function anode electrode (3) is a titanium-based electrode with a boron-doped diamond coating or a tin-antimony oxide coating.

3. The electrochemical active oxygen supply device for washing machines according to claim 2, characterized in that: The thickness of the boron-doped diamond coating and the tin-antimony oxide coating is 0.5-20 μm.

4. The electrochemical active oxygen supply device for washing machines according to claim 1, characterized in that: The cathode electrode (2) is a gas diffusion electrode composed of a gas diffusion layer and a selective catalytic layer.

5. The electrochemical active oxygen supply device for a washing machine according to claim 1, characterized in that: The cathode electrode (2) is provided with multiple liquid flow holes (21) to increase the contact area between water and the electrode.

6. The electrochemical active oxygen supply device for a washing machine according to claim 1, characterized in that: The distance between the cathode electrode (2) and the bifunctional anode electrode (3) is 1-3 mm.

7. The electrochemical active oxygen supply device for washing machines according to claim 1, characterized in that: The housing (1) includes a first housing (11) and a second housing (12) for fixing electrodes. A reaction chamber (13) for water flow is formed between the first housing (11) and the second housing (12). The first housing (11) is provided with an inlet (14) and an outlet (15) communicating with the reaction chamber (13).

8. The electrochemical active oxygen supply device for a washing machine according to claim 7, characterized in that: The first housing (11) is provided with a first limiting block (111) and a second limiting block (112) for fixing the electrode, and the second housing (12) is provided with a first limiting hole (121) and a second limiting hole (122) for fixing the electrode.

9. The electrochemical active oxygen supply device for a washing machine according to claim 1, characterized in that: The cathode electrode (2) and the dual-function anode electrode (3) are respectively electrically connected to an external power source through an electrical connection assembly (5); the cathode electrode (2), the dual-function anode electrode (3) and the electrical connection assembly (5) are fixed in the second housing (12) by a seal (6).

10. A method for preparing electrochemically active oxygen for washing machines, characterized in that: The electrochemical active oxygen supply device for a washing machine as described in any one of claims 1-9 includes the following steps: S1. Connect the cathode electrode (2) and the bifunctional anode electrode (3) to the negative and positive terminals of an external power source respectively through the electrical connection assembly (5) to form an electrochemical circuit; S2. When water flows from the inlet (14) through the reaction chamber (13), a multi-channel potentiostat is used to control the potential of the dual-function anode electrode (3) so that hydrogen peroxide and / or hydroxyl radicals are generated on its surface, forming an active oxygen treatment liquid containing hydrogen peroxide and / or hydroxyl radicals, which flows out of the reaction chamber (13) through the outlet (15).

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