Preparation method of MXene-based alkaline electrolytic water hydrogen production electrode

Abstract

The invention provides a preparation method of an MXene-based alkaline electrolytic water hydrogen production electrode. The preparation method comprises the following steps: 1, pretreatment of a base material: cleaning impurities on the base material, drying, and carrying out sand blasting roughening treatment; secondly, first metal powder and second metal powder are weighed and mixed according to a certain proportion to be guided into a powder mixing machine, vacuum drying is conducted after mixing treatment, third metal powder is prepared, the first metal powder is MAX phase powder, and the second metal powder is one or more of metal simple substances or alloys used for water electrolysis hydrogen production; thirdly, third metal powder is deposited on the surface of the pretreated base material through the plasma spraying technology, and a composite coating is obtained; 4, immersing the base material treated in the step 3 into an activation solution for activation; 5, after activation is finished, the base material is taken out and dried, and then the electrode is obtained.The method optimizes the conductivity and hydrophilicity of the electrode, and the diversity of the morphology of a plasma spraying electrode coating is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water electrolysis hydrogen production, and specifically to a method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode. Background Art

[0002] In the research of hydrogen energy technology, water electrolysis has become an important method for hydrogen production. It decomposes water into hydrogen and oxygen through electrochemical reactions, which has the advantages of being clean and efficient. However, the existing water electrolysis hydrogen production electrodes are insufficient in catalytic performance, stability and economy. Commonly used precious metal catalysts such as platinum and ruthenium are expensive and have poor stability at high current density, which limits their large-scale application. Non-precious metal catalyst Raney nickel (Ni / Al) has attracted attention due to its low cost and good catalytic performance, but it is not active enough at high current density and is easily oxidized and corroded in alkaline environments, affecting long-term performance. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode. The electrode prepared by this method has high-efficiency electrocatalytic performance, good stability, high conductivity and hydrophilicity, can effectively reduce the cost of hydrogen production, and provide technical guarantee for the application of water electrolysis hydrogen production technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode comprises the following steps:

[0006] Step 1: Substrate pretreatment: clean and dry the impurities on the substrate, and then perform sandblasting roughening treatment to obtain a sandblasted roughened substrate;

[0007] Step 2: Weigh the first metal powder and the second metal powder, mix them in a certain proportion and introduce them into a powder mixer, mix them and dry them in vacuum to obtain a third metal powder, wherein the first metal powder is a MAX phase powder, and the second metal powder is one or more metal elements or alloys used for electrolysis of water to produce hydrogen;

[0008] Step 3: Depositing the third metal powder on the surface of the pretreated substrate by plasma spraying to obtain a composite coating;

[0009] Step 4: immersing the substrate with the third metal powder obtained by spraying with the plasma spraying equipment in the third step into the activation liquid for activation;

[0010] Step 5: After activation, the substrate is taken out and dried to obtain a MXene-based alkaline water electrolysis hydrogen production electrode.

[0011] In one embodiment, the substrate is a nickel mesh to ensure good mechanical support and current distribution.

[0012] In one embodiment, the first metal powder is one or a combination of MAX phase materials, and the powder particle size is 10 to 100 microns.

[0013] In one embodiment, the metal element of the second metal powder is one or more metal elements or alloys containing Ni, Al, Co, Fe, and Mo, and the powder particle size is 10 to 100 microns.

[0014] In one embodiment, the ratio of the first metal powder to the second metal powder is 1:1-100.

[0015] In one of the embodiments, the substrate electrode is subjected to sandblasting roughening treatment, specifically comprising: sandblasting the substrate electrode with white corundum sand between 80 and 240 meshes, the sandblasting angle is controlled at 50 to 90 degrees, the air pressure during sandblasting should be 0.3 to 0.6 MPa, and the sandblasting distance should be controlled between 80 and 160 mm to increase the roughness of the substrate surface.

[0016] In one embodiment, the specific requirements of the plasma spraying process are: argon gas flow rate is 30 to 60 liters / minute, hydrogen gas flow rate is 1 to 10 liters / minute, spraying power is 20 to 35 kilowatts, spraying distance is 100 to 200 mm, and spray angle is 60 to 120 degrees.

[0017] In one embodiment, the activation solution is 4-10M KOH, the activation temperature is 60-90°C, and the activation time is 2-12 hours.

[0018] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0019] The present invention provides a method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode, wherein the MXene material has excellent electrical conductivity and hydrophilicity, can improve the current conduction and mass transfer efficiency of the electrode, thereby improving the overall electrolysis efficiency. By combining the MXene material with Raney nickel, the electrode prepared by the method provided by the present invention can comprehensively improve the catalytic efficiency and durability, overcome the disadvantages of existing plasma spraying electrodes, and the method provided by the present invention is simple to operate and is suitable for large-scale industrial production. The components of the obtained product are evenly dispersed, the bonding strength between the coating and the conductive substrate is high, and the catalytic performance is significantly improved, providing a more effective solution for the sustainable development of hydrogen energy. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] The first metal powder is selected as Ti3AlC 2， The powder particle size is 15 to 45 microns; the second metal powder is a nickel-aluminum mixed powder, and the powder particle size is 15 to 45 microns:

[0023] S1: cleaning and drying the impurities on the nickel mesh, and then using 80 purpose white corundum sandblasting roughening process, wherein the sandblasting distance is 150mm, the sandblasting angle is 60 degrees, and the sandblasting gas pressure is 0.5MPa, to obtain the nickel mesh of sandblasting roughening process;

[0024] S2: Weigh Ti 3A Ti3AlC2, nickel powder and aluminum powder are mixed in a ratio of 1:7:2 and introduced into a powder mixer. After mixing, the mixture is dried in vacuum to obtain Ti3AlC2 / nickel / aluminum mixed powder.

[0025] S3: The Ti3AlC2 / nickel / aluminum mixed powder is filled into a plasma spraying device, the spraying input power is set at 35kw, the argon flow rate is 30 liters / minute, the hydrogen flow rate is 1 liter / minute, the spraying distance is 100 mm, the spray angle is 80 degrees, and the composite coating is deposited on the pretreated nickel mesh surface at a distance of 100 mm from the nickel mesh surface;

[0026] S4: The nickel mesh (10×10 cm) with Ti3C2 / nickel-aluminum mixed powder obtained by plasma spraying in S3 was immersed in 6M KOH at 80°C for 6 hours;

[0027] S5: After activation, the nickel mesh is taken out and dried to obtain a MXene-based alkaline water electrolysis hydrogen production electrode.

[0028] Comparative Example 1

[0029] Without adding the first metal powder, the other steps are the same as those in Example 1 to obtain a Raney nickel alkaline water electrolysis hydrogen production electrode.

[0030] Test Example 1

[0031] The hydrogen evolution performance, conductivity and bonding strength between the spray coating and the substrate electrode of the MXene-based electrode and the Raney nickel electrode obtained in Example 1 and Comparative Example 1 were tested respectively. The hydrogen evolution performance of the electrode was tested using a three-electrode system, with the working electrode being a hydrogen evolution electrode, the reference electrode being Hg / HgO, the counter electrode being a platinum electrode, the electrolyte being a 30wt% KOH solution, the test temperature being 80°C, and the pressure being 3kA / m 2 The potential of the working electrode was tested under electrical density. The test results are shown in Table 1.

[0032]

[0033] By comparing the data of Example 1 and Comparative Example 2, it can be seen that the use of MXene can significantly improve the bonding strength between the electrode and the substrate, the hydrogen evolution performance and the conductivity.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode, characterized in that: The following steps are involved: Step 1: Substrate pretreatment: clean and dry the impurities on the substrate, and then perform sandblasting roughening treatment to obtain a sandblasted roughened substrate; Step 2: Weigh the first metal powder and the second metal powder, mix them in a certain proportion and introduce them into a powder mixer, mix them and dry them in vacuum to obtain a third metal powder, wherein the first metal powder is a MAX phase powder, and the second metal powder is one or more metal elements or alloys used for electrolysis of water to produce hydrogen; Step 3: Depositing the third metal powder on the surface of the pretreated substrate by plasma spraying to obtain a composite coating; Step 4: immersing the substrate with the third metal powder obtained by spraying with the plasma spraying equipment in the third step into the activation liquid for activation; Step 5: After activation, the substrate is taken out and dried to obtain a MXene-based alkaline water electrolysis hydrogen production electrode.

2. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The substrate is a nickel mesh.

3. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The first metal powder is one or a combination of several MAX phase materials, and the powder particle size is 10 to 100 microns.

4. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The second metal powder is one or more metal single substances or alloys containing Ni, Al, Co, Fe, and Mo, and the powder particle size is 10 to 100 microns.

5. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The ratio of the first metal powder to the second metal powder is 1:1-100.

6. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The specific requirements of the plasma spraying process are: argon gas flow rate of 30 to 60 liters / minute, hydrogen gas flow rate of 1 to 10 liters / minute, spraying power of 20 to 35 kilowatts, spraying distance of 100 to 200 mm, and spraying angle of 60 to 120 degrees.

7. The method for preparing a MXene-based alkaline water electrolysis hydrogen production electrode according to claim 1, characterized in that: The activation solution is 4-10M KOH, the activation temperature is 60-90°C, and the activation time is 2-12 hours.

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