A method for preparing alkaline water electrolysis electrode plates

Abstract

This invention provides a method for preparing an alkaline water electrolysis electrode plate, relating to the field of alkaline water electrolysis for hydrogen production. First, an alkali-resistant resin, a conductive polymer, conductive graphite, and nickel powder A are mixed and heated to obtain a molten liquid. Then, the molten liquid is injected into a custom mold, cooled, and demolded to obtain a preliminary plate. Finally, a mixed solution of nickel powder B and an alcohol solvent is sprayed onto both sides of the preliminary plate. After drying, an electrode plate with nickel powder on the surface and raised papillae on both sides is obtained. Using resin materials instead of traditional metal materials effectively reduces the weight and cost of the electrolytic cell while significantly avoiding the defects of stamping and forming of raised dots in traditional electrode plate preparation processes, thus improving production efficiency. The use of an injection molding process effectively balances the problems in existing fields where increasing the number of raised dots is necessary while simultaneously addressing the difficulties and high costs of processing all raised dots.

Description

Technical Field

[0001] This invention belongs to the field of alkaline water electrolysis for hydrogen production, and particularly relates to a method for preparing alkaline water electrolysis electrode plates. Background Technology

[0002] In recent years, with the development of the energy industry, hydrogen energy has gradually entered the public eye as a new energy source. Especially with the rapid increase in hydrogen usage, research on large-scale water electrolysis for hydrogen production has been included in the national energy development plan, and extensive research has been conducted on water electrolysis equipment. Currently, there are four main technical routes for water electrolysis for hydrogen production: alkaline electrolysis (AWE), proton exchange membrane electrolysis (PEM), solid oxide electrolysis (SOEC), and anion exchange membrane electrolysis (AEM). Among these, alkaline water electrolysis is the most mature, has the lowest cost, and is currently the most economical.

[0003] The alkaline electrolyzer is the core of the alkaline water electrolysis hydrogen production equipment. It generally consists of several or dozens of electrolysis chambers connected in series. Each electrolysis chamber is composed of components such as plates, electrodes, diaphragms, nickel mesh, and sealing gaskets. Figure 1 As shown, in the small chamber of the alkaline electrolyzer, the electrode plate 3 is positioned on both sides of the nickel mesh 2. Its function is to conduct electrons, making the electrolytic current density on the electrode plate more uniform, while reducing the contact resistance between the electrode plate and the nickel mesh, increasing the current density, and reducing the energy consumption for hydrogen production. Furthermore, the electrode plates are located at both ends of a complete small chamber structure, forming chambers for the flow of alkaline solution in the cathode and anode regions. This achieves the separation of the cathode and anode alkaline solutions, reducing the oxygen content in hydrogen and the hydrogen content in oxygen to a certain extent, thus ensuring the safety of the electrolyzer operation.

[0004] The electrode plate consists of two parts: the main electrode plate and the electrode frame. Currently, a complete electrode plate is made by welding the main electrode plate and the electrode frame together, and then plating the whole plate with nickel. The surfaces of both sides of the main electrode plate are evenly distributed with spherical uneven structures, such as... Figure 1 As shown, the concave-convex structure is generally made by stamping. These structures, on the one hand, allow the electrodes on both sides of the diaphragm 1 to form reliable multi-point electrical contact in a "top-to-top" configuration 7. The greater number of contact protrusions reduces the contact resistance inside the single-cell chamber. On the other hand, the concave-convex structure and the nickel mesh form the internal cavity and circulation channel 6 of the electrolysis unit. This prevents the electrolyte from flowing directly upwards when entering the electrode channel of the electrolysis unit, forcing it to pass through the curved gaps between many spherical concave-convex structures. This enhances the flow disturbance, reduces the electrolyte concentration difference throughout the channel, and makes the electrolyte distribution more uniform, thereby reducing the energy consumption of the electrolysis equipment and improving its long-term operational stability.

[0005] Currently, the electrode plates in existing alkaline electrolyzers are generally made of cast iron, nickel, or stainless steel plates through machining, which involves numerous processing steps and is expensive to manufacture. Electrolyzers assembled using these electrode plates are not only heavy, but also require careful attention to avoid potential short circuits between the plates. Furthermore, due to the harsh operating environment of alkaline electrolyzers, the electrode frame of these plates is highly susceptible to corrosion, affecting the normal operation of the electrolyzer.

[0006] Furthermore, current electrode fabrication methods simultaneously incorporate both papillary (5) and grooved (4) structures per unit area. Therefore, the number of papillary structures can only be half. A higher number of papillary structures serves two purposes: firstly, it improves contact between the electrode and the plate, reducing contact resistance and chamber voltage; secondly, during electrolysis, hydrogen and oxygen bubbles continuously precipitate from the electrode surface, coalescing into large bubbles. This increases the resistance within the electrolyte. A more porous structure between the electrode and the plate reduces the probability of large bubbles forming in the electrolyte, thus minimizing the likelihood of significant resistance and reducing the impact of bubbles on current density. Therefore, from a performance perspective, a higher number of papillary structures is preferable. However, from a manufacturing cost perspective, increasing the number of papillary structures directly increases stamping costs, and limitations in machinery and materials prevent an unlimited increase in the number of papillary structures. Summary of the Invention

[0007] Given the current manufacturing problems of electrode plates and the limitations of papillary structures on performance improvement, the research and development of new low-cost, high-performance electrode plates has become an urgent issue to be addressed.

[0008] To solve the above-mentioned technical problems, the present invention provides a method for preparing an alkaline water electrolysis electrode plate, comprising the following steps:

[0009] Step 1: Mix the alkali-resistant resin, conductive polymer, conductive graphite, and nickel powder A to obtain a mixture;

[0010] Step 2: Heat and melt the mixture from Step 1, stirring to obtain a molten liquid;

[0011] Step 3: Inject the molten liquid into a custom mold, and use the mold injection method to obtain the initial plate after demolding;

[0012] Step 4: Weigh out nickel powder B, add it to an alcohol solvent to prepare a mixed solution, then spray it onto both sides of the initial plate obtained in step 3, heat and dry it to obtain an electrode plate with nickel powder and papillae on the surface;

[0013] Among them, the particle size of nickel powder A is 50-200nm, and the particle size of nickel powder B is 10-30nm;

[0014] The main electrode plate forming cavity and the electrode frame forming cavity are interconnected by the customized mold block. The main electrode plate forming cavity is formed by the assembly of the front mold and the rear mold. The front mold and the rear mold are both provided with arrayed nipple cavities.

[0015] Furthermore, in step one, the alkali-resistant resin is any one of epoxy resin, vinyl resin, bisphenol A type unsaturated polyester, and furan resin.

[0016] Furthermore, in step one, the conductive polymer is any one of polypyrrole, polyaniline, and polythiophene.

[0017] Furthermore, in step one, the conductive graphite is any one of expanded graphite, flake graphite, and microcrystalline graphite.

[0018] Furthermore, in step one, the mass ratio of alkali-resistant resin, conductive polymer, conductive graphite, and nickel powder A is alkali-resistant resin : conductive polymer : conductive graphite : nickel powder A = 1 : 0.2-0.6 : 0.05-0.1 : 5-8.

[0019] Furthermore, in step two, the heating temperature is 150-200℃.

[0020] Further, in step four, the nickel powder B content in the mixed solution is 100-400 mg / mL; the alcohol solvent is any one of methanol, ethanol, or isopropanol; the spraying flow rate is 3-7 mL / min, and the spraying speed is 20-40 mm / s; the heating and drying temperature is 60-80℃; and the nickel powder B content on the surface of the electrode plate is 20-40 mg / cm³. 2 .

[0021] Beneficial effects:

[0022] 1. This invention uses a mixture of alkali-resistant resin, conductive polymer, and conductive graphite material. On the one hand, the resin and conductive polymer material strengthen the bonding strength of different materials, giving the electrode plate high conductivity and high mechanical properties. This can meet the requirements of different electrolytic cells for electrode plate tensile strength, bending strength, conductivity, corrosion resistance, and cost.

[0023] 2. The conductive polymer and conductive graphite material in the electrode plate prepared by this invention provide high electronic conductivity, the alkali-resistant resin gives the electrode plate sufficient density and durability, and the addition of nickel powder further increases the conductivity and corrosion resistance of the electrode plate. While improving the strength and corrosion resistance of the bipolar plate, the conductivity of the electrode plate is further enhanced.

[0024] 3. This invention employs injection molding to produce an electrode plate with a double-sided raised structure and no grooves. Each surface is covered with dense papillae (protrusions), resulting in low contact resistance and significantly high current density. Furthermore, the multi-protrusion structure increases the inflow disturbance of the alkali solution, preventing alkali precipitation from blocking alkali transport. Additionally, during water electrolysis, hydrogen and oxygen continuously precipitate from the electrode surface as bubbles, which then coalesce into large bubbles. This causes a sharp increase in the resistance within the electrolyte; the more protrusions on the multi-protrusion electrode plate... The more points of contact with the electrodes, the more and denser the flow channel structure is formed. These dense flow channel structures reduce the probability of large bubbles forming in the alkali solution, thus reducing the likelihood of significant resistance and minimizing the impact of bubbles on current density. Furthermore, the more protrusions there are, the smaller the overall cavity becomes, resulting in more flow channel structures. Therefore, under the same alkali solution flow rate, the alkali solution flows faster, preventing localized overheating in the electrolytic cell. This leads to a more uniform temperature distribution within the electrolytic cell, significantly improving the electrolysis efficiency and service life of the electrolytic cell.

[0025] 4. The electrode plate prepared by this invention adopts an injection molding process, which avoids the welding process required between the electrode frame and the main electrode plate in traditional processes, thus avoiding gas leakage and electrode frame corrosion caused by incomplete welding. Furthermore, it avoids the tendency for weld seams in metal materials to crack under stress. In addition, resin materials are used instead of traditional metal materials. During the electrode plate preparation process, various materials are mixed and integrally molded. The components in the mixture must be controlled within a certain proportion range; increasing or decreasing any component will lead to adverse changes in the mechanical strength and conductivity of the prepared electrode plate. Moreover, the temperature rise and fall during the electrode plate preparation process can affect the electrode plate's properties. The integrity of the molding process is crucial. For example, if the temperature is too low, the prepared electrode may have defects such as cavities; if the temperature is too high, the prepared electrode may have problems such as bubbles. Therefore, the process conditions play a vital role in the preparation process. Furthermore, using resin materials instead of traditional metal materials effectively reduces the weight and cost of the electrolytic cell while greatly avoiding the defects of bump stamping in traditional electrode preparation processes, improving production efficiency and facilitating the large-scale industrial production of this product to meet the requirements of alkaline electrolytic cells. In other words, this invention uses an injection molding process, effectively balancing the existing problems of increasing the number of bumps while simultaneously addressing the difficulties and high costs of processing all bumps.

[0026] 5. In this invention, after the initial plate is formed, a layer of nickel powder is sprayed on its surface, which further improves the corrosion resistance and airtightness of the plate, thereby making the hydrogen gas produced more pure and the surface smoother, avoiding the formation of large particles or agglomerates, which could damage the diaphragm under pressure. In addition, the contact between small nickel powder particles is closer, thereby improving conductivity.

[0027] In addition, the present invention firstly has nickel powder A with larger particles in the molten state, which allows the alkali-resistant corrosion-resistant resin, conductive polymer and conductive graphite material to be fully filled in the gaps between the larger nickel powder particles A. The large nickel powder particles A can also be fully dispersed, and will not cause defects such as uneven dispersion due to agglomeration caused by the particles being too small, which in turn leads to uneven heat transfer of the electrode plate and hot spot problems, reducing the service life of the electrolytic cell.

[0028] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a main electrode plate with a concave-convex structure forming a "top-to-top" configuration in an electrolysis chamber, as described in the prior art.

[0030] Figure 2 The structural diagram of the mold customized for this application omits the pole frame forming cavity;

[0031] Figure 3 This is a schematic diagram of a main electrode plate in an electrolysis chamber of this application, which has only papillary structures and forms a "top-to-top" configuration.

[0032] In the picture:

[0033] 1. Diaphragm; 2. Nickel mesh; 3. Electrode plate; 4. Groove; 5. Papillary; 6. Cavity and circulation channel; 7. Top-to-top configuration; 8. Front mold; 9. Rear mold; 10. Main electrode plate forming cavity; 11. Papillary cavity. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0036] The custom molds applicable to the following embodiments and comparative examples include a main electrode plate forming cavity 10 and an electrode frame forming cavity (the electrode frame serves to transmit gas, liquid, and the sealing line bonding area; the electrode frame is a common and conventional structure in existing electrode plate structures, and the electrode frame forming cavity is not shown in the attached drawings) that are interconnected with each other. Figure 2 As shown, the main electrode plate forming cavity 10 is formed by assembling and installing the front mold 8 and the rear mold 9, and the front mold 8 and the rear mold 9 are both provided with arrayed nipple cavities 11.

[0037] The slurry is injected into the main electrode plate forming cavity 10 using a mold injection molding process, and fills the nipple cavity 11 and the electrode frame forming cavity. The slurry filled in the cavity is then rapidly solidified and formed during the subsequent cooling process. Finally, a custom mold is used to open the mold and obtain the initial plate.

[0038] Using the preparation method of this invention, after the initial plate is prepared and the electrode plate is formed, it is an integral plate with papillary structures distributed on both sides. In an electrolysis chamber, the two electrode plates are placed on both sides of the diaphragm, as follows. Figure 3 As shown, the nipple structure 5 of the two electrode plates forms a top-to-top configuration 7, which creates multi-point electrical contact. The nipple structure 5 and the nickel mesh 2 also constitute the internal cavity and circulation channel 6 of the electrolysis unit. This prevents the electrolyte from flowing directly upwards when entering the electrode channel of the electrolysis unit. Instead, it must pass through the bending gaps between many spherical concave and convex structures. This helps to enhance the degree of flow disturbance, reduce the electrolyte concentration difference in various parts of the channel, and make the electrolyte distribution more uniform. This reduces the energy consumption of the electrolysis equipment and improves its long-term operational stability.

[0039] Using the preparation method of this invention, after the initial plate is prepared and the electrode plate is formed, it is an integral plate with papillae 5 structures distributed on both sides. In an electrolysis chamber, the two electrode plates 3 are respectively placed on both sides of the diaphragm 1, as follows. Figure 3 As shown, the nipple structures 5 of the two electrode plates 3 form a top-to-top configuration 7, which creates multi-point electrical contact. The nipple structures 5 and the nickel mesh 2 also constitute the internal cavity and circulation channel 6 of the electrolysis unit. This prevents the electrolyte from flowing directly upwards when entering the electrode channel of the electrolysis unit. Instead, it must pass through the bending gaps between many spherical protrusions, which helps to enhance the degree of flow disturbance, reduce the electrolyte concentration difference in various parts of the channel, and make the electrolyte distribution more uniform. This reduces the energy consumption of the electrolysis equipment and improves its long-term operational stability.

[0040] Example 1:

[0041] 1. Weigh 100g of epoxy resin, 20g of polypyrrole, 10g of expanded graphite and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat the mixture to 150℃ to completely melt the polymer and form a molten liquid.

[0042] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0043] 3. Weigh 10g of nickel powder B with a particle size of 10nm and add it to 100mL of ethanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0044] 4. Using a spraying process with a spraying flow rate of 3 mL / min and a spraying speed of 20 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 60℃, a surface nickel powder content of 20 mg / cm³ is obtained. 2 The electrode plates have a dense papillary structure.

[0045] Example 2:

[0046] 1. Weigh 100g of vinyl resin, 60g of polyaniline, 5g of flake graphite and 800g of nickel powder A with a particle size of 200nm and mix them together. Heat to 200℃ to completely melt the polymer and form a molten liquid.

[0047] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0048] 3. Weigh 10g of nickel powder B with a particle size of 30nm and add it to 40g of isopropanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0049] 4. Using a spraying process with a spraying flow rate of 7 mL / min and a spraying speed of 40 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 80℃, a surface nickel powder content of 40 mg / cm³ is obtained. 2 The electrode plates have a dense papillary structure.

[0050] Example 3:

[0051] 1. Weigh 100g of bisphenol A type unsaturated resin, 40g of polythiophene, 8g of microcrystalline graphite and 600g of nickel powder A with a particle size of 100nm and mix them together. Heat to 180℃ to completely melt the polymer and form a molten liquid.

[0052] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0053] 3. Weigh 10g of nickel powder B with a particle size of 20nm and add it to 60g of methanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0054] 4. Using a spraying process with a spraying flow rate of 5 mL / min and a spraying speed of 30 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 70℃, a surface nickel powder content of 30 mg / cm³ is obtained.2 The electrode plates have a dense papillary structure.

[0055] Comparative Example 1: (Without conductive graphite)

[0056] 1. Weigh 100g of epoxy resin, 20g of polypyrrole and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat to 150℃ to completely melt the polymer and form a molten liquid.

[0057] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0058] 3. Weigh 10g of nickel powder B with a particle size of 10nm and add it to 100g of ethanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0059] 4. Using a spraying process with a spraying flow rate of 3 mL / min and a spraying speed of 20 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 60℃, a surface nickel powder content of 20 mg / cm³ is obtained. 2 The electrode plates have a dense papillary structure.

[0060] Comparative Example 2: (Surface not coated with nickel powder B)

[0061] 1. Weigh 100g of epoxy resin, 20g of polypyrrole, 10g of expanded graphite and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat the mixture to 150℃ to completely melt the polymer and form a molten liquid.

[0062] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the electrode plate.

[0063] Comparative Example 3: (Without conductive polymer)

[0064] 1. Weigh 100g of epoxy resin, 10g of expanded graphite and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat the mixture to 150℃ to completely melt the polymer and form a molten liquid.

[0065] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0066] 3. Weigh 10g of nickel powder B with a particle size of 10nm and add it to 100g of ethanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0067] 4. Using a spraying process with a spraying flow rate of 3 mL / min and a spraying speed of 20 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 60℃, a surface nickel powder content of 20 mg / cm³ is obtained. 2 The electrode plates have a dense papillary structure.

[0068] Comparative Example 4: (Nickel powder A)

[0069] 1. Weigh 100g of epoxy resin, 20g of polypyrrole, 10g of expanded graphite and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat the mixture to 150℃ to completely melt the polymer and form a molten liquid.

[0070] 2. Inject the molten liquid from step 1 into a custom mold, fill the entire mold using injection molding, and demold after natural cooling to obtain the initial plate;

[0071] 3. Weigh 10g of nickel powder A with a particle size of 50nm and add it to 100g of ethanol. After dispersing evenly, a mixture of nickel powder A is obtained.

[0072] 4. Using a spraying process with a spraying flow rate of 3 mL / min and a spraying speed of 20 mm / s, the nickel powder A mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 60℃, a surface nickel powder content of 20 mg / cm³ is obtained. 2 The electrode plates have a dense papillary structure.

[0073] Comparative Example 5: (Using the same material to make electrode plates with concave and convex structures)

[0074] 1. Weigh 100g of epoxy resin, 20g of polypyrrole, 10g of expanded graphite and 500g of nickel powder A with a particle size of 50nm and mix them together. Heat the mixture to 150℃ to completely melt the polymer and form a molten liquid.

[0075] 2. The molten liquid from step 1 is injected into a customized mold with a spherical uneven structure on the surface of the existing main electrode plate. The mold is filled with the molten liquid using injection molding. After natural cooling, the plate is demolded to obtain the initial plate.

[0076] 3. Weigh 10g of nickel powder B with a particle size of 10nm and add it to 100g of ethanol. After dispersing evenly, a mixture of nickel powder B is obtained.

[0077] 4. Using a spraying process with a spraying flow rate of 3 mL / min and a spraying speed of 20 mm / s, the nickel powder B mixture from step 3 is sprayed onto both sides of the initial plate obtained in step 2. After drying at 60℃, a surface nickel powder content of 20 mg / cm³ is obtained. 2 Anodally shaped electrode plate.

[0078] Test conditions:

[0079] The tensile strength and flexural strength of this invention are tested using a universal testing machine under the following conditions: temperature 25°C and humidity 40%. The electrical conductivity is tested directly using a four-probe resistance tester.

[0080] Table 1

[0081]

[0082]

[0083] As shown in Table 1, the results of the embodiments demonstrate that the conductive polymer material and conductive graphite in the electrode plate prepared by this invention provide high electronic conductivity, with conductivity exceeding 120 S / cm, meeting the requirements for high-current operation in alkaline electrolytic cells. Furthermore, the polymer resin material imparts sufficient density to the electrode plate, preventing interpenetration between the materials on both sides. The functional materials enhance the corrosion resistance and mechanical strength of the electrode plate. This technology can resolve the contradiction between conductivity and mechanical properties in traditional plastic bipolar plates, improving both the strength and corrosion resistance of the bipolar plate while further enhancing its conductivity.

[0084] In the comparative examples, Comparative Example 1, without the addition of conductive graphite, exhibits low conductivity. Comparative Example 2, where the electrode surface is not coated with nickel powder, results in high surface contact resistance and thus low conductivity, but its mechanical strength remains unaffected. Comparative Example 3, lacking conductive polymer, fails to form a complete conductive network structure within the electrode, leading to high resistance and low conductivity. Furthermore, the absence of a high-molecular-weight conductive material reduces mechanical strength to some extent, causing deformation of the papillary structure during operation, resulting in uneven liquid flow and affecting electrolytic performance. The reduced mechanical strength also makes the protruding structure prone to deformation during operation, further impacting electrochemical performance. Comparative Example 4, with its surface coated with large-particle nickel powder, exhibits large surface voids, resulting in low conductivity, but its mechanical strength remains unchanged. Comparative Example 5, prepared using a traditional concave-convex electrode mold through injection molding, yields an electrode with few protrusions on one side, poor electrochemical performance, and low mechanical strength.

[0085] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preparing an alkaline water electrolysis electrode plate, characterized in that, Includes the following steps: Step 1: Mix the alkali-resistant resin, conductive polymer, conductive graphite, and nickel powder A to obtain a mixture; Step 2: Heat and melt the mixture from Step 1, stirring to obtain a molten liquid; Step 3: Inject the molten liquid into a custom mold, and use the mold injection method to obtain the initial plate after demolding; Step 4: Weigh nickel powder B, add it to an alcohol solvent to prepare a mixed solution, then spray it onto both sides of the initial plate obtained in step 3, heat and dry it to obtain an electrode plate (3) with nickel powder and papillae (5) on the surface. Among them, the particle size of nickel powder A is 50-200nm, and the particle size of nickel powder B is 10-30nm; The customized mold package includes a main electrode plate forming cavity (10) and an electrode frame forming cavity that are interconnected. The main electrode plate forming cavity (10) is formed by combining and installing a front mold (8) and a rear mold (9). Both the front mold (8) and the rear mold (9) are provided with arrayed nipple cavities (11). After the initial plate is prepared and the electrode plate (3) is formed, it is an integrated plate with papillary (5) structures distributed on both sides. In an electrolysis chamber, the two electrode plates (3) are placed on both sides of the diaphragm (1) to form a main electrode plate with only papillary structure and in a "top to top" form.

2. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step one, the alkali-resistant resin is any one of epoxy resin, vinyl resin, bisphenol A type unsaturated polyester, and furan resin.

3. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step one, the conductive polymer is any one of polypyrrole, polyaniline, and polythiophene.

4. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step one, the conductive graphite is any one of expanded graphite, flake graphite, and microcrystalline graphite.

5. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step one, the mass ratio of alkali-resistant corrosion resin, conductive polymer, conductive graphite and nickel powder A is alkali-resistant corrosion resin: conductive polymer: conductive graphite: nickel powder A = 1:0.2-0.6:0.05-0.1:5-8.

6. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step two, the heating temperature is 150-200℃.

7. The method for preparing alkaline water electrolysis electrode plates as described in claim 1, characterized in that, In step four, the nickel powder B content in the mixed solution is 100-400 mg / mL; the alcohol solvent is any one of methanol, ethanol, or isopropanol; the spraying flow rate is 3-7 mL / min, and the spraying speed is 20-40 mm / s; the heating and drying temperature is 60-80℃; and the nickel powder B content on the electrode surface is 20-40 mg / cm³. 2 .

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