CN115233237A - Method for preparing cathode electrode for hydrogen production by electrolyzing water and reaction solution - Google Patents

Method for preparing cathode electrode for hydrogen production by electrolyzing water and reaction solution Download PDF

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CN115233237A
CN115233237A CN202210986654.0A CN202210986654A CN115233237A CN 115233237 A CN115233237 A CN 115233237A CN 202210986654 A CN202210986654 A CN 202210986654A CN 115233237 A CN115233237 A CN 115233237A
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reaction solution
nickel
cathode electrode
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noble metal
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裴渊韬
郑宇�
王宏媛
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Shenzhen Tolingke Industrial Development Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B23/00—Obtaining nickel or cobalt
    • C22B23/04—Obtaining nickel or cobalt by wet processes
    • C22B23/0407—Leaching processes
    • C22B23/0446—Leaching processes with an ammoniacal liquor or with a hydroxide of an alkali or alkaline-earth metal
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/054—Electrodes comprising electrocatalysts supported on a carrier
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
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    • C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
    • C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
    • C25B11/061—Metal or alloy
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
    • C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
    • C25B11/081—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound the element being a noble metal
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The application provides a method for preparing a cathode electrode for hydrogen production by electrolyzing water and a reaction solution, wherein the reaction solution is prepared by a specific formula, a nickel substrate is immersed into the reaction solution for a displacement reaction, and compressed air is introduced into the reaction solution for air stirring, so that the cathode electrode for hydrogen production by electrolyzing water, the internal substrate of which is metallic nickel and the surface of which is noble metal, is prepared by a simple process and a small amount of noble metal consumption.

Description

Method for preparing cathode electrode for hydrogen production by electrolyzing water and reaction solution
Technical Field
The application relates to the technical field of hydrogen production by electrolyzing water, in particular to a method for preparing a cathode electrode for hydrogen production by electrolyzing water and a reaction solution used by the method.
Background
With the wide construction of new energy power stations such as photovoltaic power stations, wind power stations and the like, the scale of hydrogen energy storage requirements for storing electric energy which cannot be on line in a hydrogen energy form by using water electrolysis hydrogen production equipment is also sharply enlarged. At present, the electrolytic alkaline water is adopted to produce hydrogen, the power consumption for producing 1 standard cubic meter of hydrogen is about 5kWh, and the energy conversion efficiency is about 70%. The energy conversion efficiency is influenced by the structure of equipment parts, and the part is nearly optimized to the limit through long-time updating iteration; on the other hand, the catalytic water electrolysis activity of the hydrogen production electrode is directly related, and currently, a nickel woven mesh or foam nickel is still adopted as a cathode and an anode, but sufficient optimization and promotion space still exists.
Noble metals such as platinum, palladium, rhodium and the like represented by platinum are used as a cathode, so that the hydrogen production activity by water electrolysis is extremely high, the potential of the cathode is close to 0, but the noble metals are directly used as electrodes, so that the price is high, the cost is high, and the application is difficult, so that the development of the high-efficiency hydrogen production electrode by water electrolysis with low noble metal content is of great significance.
Content of application
In view of the above, the present application provides a method for preparing a cathode electrode for hydrogen production by electrolyzing water and a reaction solution, which can prepare a high-efficiency electrode with a small amount of precious metal consumption.
According to one aspect of the application, a method for preparing a cathode electrode for hydrogen production by electrolysis of water comprises:
providing a reaction solution: 4-8 g/L of noble metal salt and 15-25 g/L of ammonium chloride, and adding ammonia water to adjust the pH value of the reaction solution to 8.5-9.5 by taking deionized water as a solvent;
immersing a nickel matrix in the reaction liquid for a displacement reaction, introducing compressed air into the reaction liquid for air stirring, so that the noble metal precipitated by the reaction is attached to the surface of the nickel matrix to form a noble metal layer, taking out the prepared cathode electrode, cleaning and drying, wherein the nickel matrix is subjected to surface cleaning treatment before being immersed in the reaction liquid.
In a preferred embodiment, the noble metal is platinum, palladium or rhodium.
In a preferred embodiment, the noble metal salt is diammineplatinum nitrite, dichlorodiaminopalladium, tetraaminepalladium dichloride, rhodium sulfate or rhodium chloride.
In a preferred embodiment, the geometric area of the nickel matrix and the volume of the reaction solution are matched in a ratio of 1m during the displacement reaction 2 ：20～40L。
In a preferred embodiment, the flow rate of the compressed air fed for air agitation is set to 500 to 800L/min/m 2 "m" in the unit of the amount of the gas flow 2 "means the area of the liquid surface of the reaction solution after the reaction solution is placed in the reaction vessel.
In a preferred embodiment, the time for the air agitation is set to 10 to 20 hours.
In a preferred embodiment, the drying temperature for drying the prepared cathode electrode is set to 60 to 90 ℃.
In a preferred embodiment, before immersing the nickel substrate in the reaction liquid, the nickel substrate is immersed in an alkali solution to perform degreasing and degreasing treatment, then washed with ultrapure water, then immersed in an acid solution, and then dried after rinsing with ultrapure water.
In a preferred embodiment, the acid solution is a HCl solution with a concentration of 2 to 4M; the alkali solution is KOH solution, and the concentration is 1-5M.
In a preferred embodiment, the nickel matrix is flat nickel, a woven nickel mesh or foamed nickel.
According to another aspect of the present application, a reaction solution for preparing a cathode electrode for hydrogen production by electrolyzing water for a displacement reaction with a nickel substrate to form a noble metal layer on the surface of the nickel substrate, the reaction solution comprising: 4-8 g/L of noble metal salt, 15-25 g/L of ammonium chloride, and adjusting the pH value of the reaction solution to 8.5-9.5 by ammonia water by taking deionized water as a solvent.
In a preferred embodiment, the noble metal is platinum, palladium or rhodium.
In summary, the application provides a method for preparing a cathode electrode for hydrogen production by electrolyzing water and a reaction solution, wherein the reaction solution is prepared by a specific formula, a nickel-based body is immersed in the reaction solution for a displacement reaction, and compressed air is introduced into the reaction solution for air stirring, so that the cathode electrode for hydrogen production by electrolyzing water, the internal matrix of which is metallic nickel and the surface of which is a noble metal, is prepared by a simple process and a small amount of noble metal consumption.
Drawings
Fig. 1 is a schematic flow diagram of a preparation method of the present application.
Fig. 2 is a scanning electron microscope image of a cathode electrode for hydrogen production by water electrolysis with nickel foam as a matrix and a platinum metal layer as an active layer, prepared by the present application, at a scale of 40 micrometers.
Fig. 3 is a scanning electron microscope image of a cathode electrode for hydrogen production by electrolysis with nickel foam as a matrix and a platinum metal layer as an active layer, prepared according to the present application, at a scale of 10 μm.
Fig. 4 is an ac impedance diagram of a cathode electrode prepared according to the preparation method of the present application.
Fig. 5 is a comparison graph of linear sweep voltammetry curves of hydrogen evolution performance of the cathode electrode prepared according to the preparation method of the present application and the nickel substrate directly used as the cathode electrode.
Detailed Description
To facilitate an understanding of the present application, it is described more fully below. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
On one hand, the application provides a method for producing hydrogen by electrolyzing water, nickel metal is selected as a matrix of the cathode electrode, and the cathode for electrolyzing water manufactured by the method has good chemical corrosion resistance, good conductivity and physical properties, and can enhance the electrolysis efficiency, greatly prolong the service life and save energy consumption. The use of noble metals as electrodes has high electrolytic activity and greatly improved electrolytic efficiency, but noble metals are expensive, which greatly increases the cost and makes industrial mass application difficult. According to the method, a small amount of precious metal is coated on the surface of the nickel-based body, the prepared cathode electrode is high in electrolytic activity, and the energy conversion efficiency can be greatly improved, so that the hydrogen is efficiently produced by electrolyzing water, the preparation method can be carried out at normal temperature and normal pressure, the preparation conditions are safe and mild, the process is simple and easy to implement, the method is suitable for industrial large-scale application, and the problem of high power consumption when the general cathode electrode for producing hydrogen by electrolyzing water is applied to the hydrogen production industry is effectively solved.
In another aspect, the present application provides a reaction solution for preparing a cathode electrode for hydrogen production by electrolyzing water, for performing a displacement reaction with a nickel substrate to form a noble metal layer on a surface of the nickel substrate, the reaction solution comprising: 4-8 g/L of noble metal salt, 15-25 g/L of ammonium chloride and deionized water as a solvent, and adjusting the pH value of the reaction solution to be 8.5-9.5 by ammonia water.
It should be noted that the thickness of the nickel matrix used in this application does not exceed 2mm.
Specifically, as shown in fig. 1, the method for preparing the cathode electrode for hydrogen production by electrolyzing water comprises the following steps:
s1, providing a reaction solution: 4-8 g/L of noble metal salt, 15-25 g/L of ammonium chloride, and adding ammonia water to adjust the pH value of the reaction solution to 8.5-9.5 by taking deionized water as a solvent;
and S2, immersing the nickel substrate into the reaction liquid for a displacement reaction, introducing compressed air into the reaction liquid for air stirring, so that the noble metal precipitated by the reaction is attached to the surface of the nickel substrate to form a noble metal layer, taking out the prepared cathode electrode, cleaning and drying.
Preferably, in the above method, the nickel substrate is subjected to surface cleaning treatment before being immersed in the reaction liquid.
Wherein, the nickel substrate can be flat nickel, nickel woven mesh or foam nickel. The noble metal may be platinum, palladium or rhodium; correspondingly, the noble metal salt may be diammineplatinum nitrite, dichlorodiaminopalladium, tetraaminepalladium dichloride, rhodium sulfate or rhodium chloride.
Through research, under an acidic condition, the nickel substrate and hydrogen ions generate side reaction, the uniformity of the noble metal replacement layer can be influenced by the separated hydrogen, and when the pH value of the reaction liquid is higher than 9.5, the reaction liquid can generate an unstable condition to influence the replacement reaction; therefore, on the basis of a large amount of experimental researches, the pH value of the reaction solution is set to be between 8.5 and 9.5, and the cathode electrode prepared under the conditions has better performance.
In the preparation method, the matching ratio of the geometric area of the nickel matrix to the volume of the reaction solution is 1m 2 : 20-40L, namely 20-40L of reaction liquid is used for each square meter of nickel substrate. Researches show that the proportion range is matched to ensure that the noble metal salt can fully react, the content of the noble metal in the cathode electrode is increased, the material waste is avoided, and the cost is saved.
In the preparation method, the compressed air is continuously introduced to the bottom of the reaction container in the reaction process to stir the reaction liquid, so that the displacement reaction is uniformly carried out on all parts of the surface of the nickel base, the uniformity of the noble metal layer attached to the surface of the nickel base is enhanced, the integral uniformity of the cathode electrode is improved, the product performance is improved, the reaction rate can be obviously accelerated, and the reaction time is shortened.
Preferably, the flow rate of the air introduced into the tank for air agitation is set to 500 to 800L/min/m 2 Wherein "m" in the unit of the air flow rate 2 "means the area of the liquid surface of the reaction solution after the reaction solution is placed in the reaction vessel. Research shows that the product performance of the product prepared by introducing compressed air in the air flow range is better.
Preferably, the time for introducing the compressed air is set to 10 to 20 hours. Research shows that the compressed air is introduced for less than 10 hours, the replacement reaction is incomplete, material waste is caused, and the performance of the prepared cathode electrode is influenced; the compressed air is introduced for more than 20 hours, the displacement reaction is already complete, and the compressed air is not required to be introduced any more.
Preferably, the prepared cathode electrode is taken out and washed with ultrapure water and then dried at a temperature of 60 to 90 ℃.
The surface cleaning treatment of the nickel substrate can use acid solution or alkali solution, including: before immersing the nickel substrate in the reaction solution, the nickel substrate can be immersed in an alkali solution to carry out degreasing and oil removal treatment, washed by ultrapure water, immersed in an acid solution, rinsed by ultrapure water and dried. Wherein, the acid solution can be HCl solution, and the molar concentration of the HCl solution is set to be 2-4M; the alkali solution can be KOH solution, and the molar concentration of the KOH solution is set to be 1-5M.
Referring to fig. 2 and fig. 3, fig. 2 is a scanning electron microscope image of a cathode electrode for hydrogen production by water electrolysis with nickel foam as a matrix and a platinum metal layer as an active layer, prepared according to the present application, at a scale of 40 μm. Fig. 3 is a scanning electron microscope image of a cathode electrode for hydrogen production by electrolysis with nickel foam as a matrix and a platinum metal layer as an active layer, prepared according to the present application, at a scale of 10 μm. As clearly seen from the figure, the platinum metal layer is uniformly covered on the surface of the nickel base, and the surface of the platinum metal layer is relatively flat, so that the cathode electrolysis with better quality can be prepared according to the method for preparing the cathode electrode by electrolyzing water, and the replacement reaction effect is good.
As shown in fig. 4, which is an ac impedance diagram of the cathode electrode prepared according to the preparation method of the present application in 1M KOH solution at 25 ℃, it can be seen that the cathode electrode shows lower electrochemical impedance and higher catalytic activity.
As shown in fig. 5, it is a comparison graph of linear sweep voltammetry curves of hydrogen evolution performance of the cathode electrode A1 prepared according to the preparation method of the present application and the cathode electrode A2 directly made of nickel matrix, wherein the cathode electrode prepared according to the present application is a cathode electrode using nickel foam as matrix and platinum metal layer as activation layer, and the areal density of the nickel foam is 480g/m 2 The thickness is 1.8mm; in contrast theretoThe cathode electrode of the cathode is directly made of foamed nickel as an electrode. It can be seen from the figure that the cathode electrode with the platinum metal layer attached thereto has an electrification potential of about 0, and the current density can be much higher than that of the cathode electrode directly made of foamed nickel under the same overpotential.
The following is a specific example of the method of producing a cathode electrode for hydrogen production by electrolysis of water as described above.
Example 1
In the embodiment, the cathode electrode for hydrogen production by electrolyzing water, which takes the nickel woven mesh as a matrix and the platinum metal layer as an active layer, is prepared by the following specific steps:
(1) At room temperature, 1m 2 Soaking the nickel woven net in 1M KOH solution for 10 minutes to degrease and remove oil, and cleaning with ultrapure water; then putting the substrate into 2M HCl solution to be soaked for 10 minutes to further remove impurities on the surface of the substrate; finally, washing the mixture for 2 minutes by using ultrapure water and drying the mixture for later use.
(2) Preparing a displacement reaction solution according to the following formula: 4g/L of diammine platinum nitrite and 15g/L of ammonium chloride, adding ammonia water into deionized water serving as a solvent, and adjusting the amount of the ammonia water to adjust the pH value of the replacement reaction solution to be between 8.5 and 9.5, for example, setting the pH value to be 8.5.
(3) And (3) immersing the nickel woven mesh treated in the step (1) in 20L of the replacement reaction solution prepared in the step (2).
(4) At room temperature, continuously introducing compressed air into the bottom of the reaction vessel, and stirring with air flow of 500L/min/m 2 After 10 hours, the aeration was stopped, and the cathode electrode was taken out and rinsed with ultrapure water for 2 minutes and then dried at 60 ℃.
Example 2
In the embodiment, the cathode electrode for hydrogen production by water electrolysis with nickel foam as a matrix and a palladium metal layer as an active layer is prepared by the following specific steps:
(1) At room temperature, 0.5m 2 Soaking foamed nickel in 3M KOH solution for 30 minutes to degrease and remove oil, and cleaning with ultrapure water; then putting the substrate into 2.5M HCl solution for soaking for 5 minutes to further remove impurities on the surface of the substrate; finally, rinsing the mixture for 5 minutes by using ultrapure water and drying the mixture for later use.
(2) Preparing a displacement reaction solution according to the following formula: 4g/L of dichlorodiaminopalladium and 25g/L of ammonium chloride, adding ammonia water into deionized water serving as a solvent, and adjusting the amount of the ammonia water to adjust the pH value of the replacement reaction liquid to be between 8.5 and 9.5, for example, setting the pH value to be 9.
(3) Immersing the foamed nickel treated in the step (1) in 15L of the replacement reaction liquid prepared in the step (2).
(4) At room temperature, continuously introducing compressed air into the bottom of the reaction vessel, and stirring with air at a flow rate of 800L/min/m 2 After 15 hours, the aeration was stopped, and the cathode electrode was taken out and rinsed with ultrapure water for 5 minutes and then dried at 90 ℃.
Example 3
In the embodiment, the cathode electrode for hydrogen production by electrolyzing water, which takes flat nickel as a substrate and a rhodium metal layer as an active layer, is prepared by the following specific steps:
(1) At room temperature, 0.1m 2 Soaking the flat nickel in 5M KOH solution for 30 minutes to degrease and remove oil, and cleaning with ultrapure water; then putting the substrate into a 4M HCl solution to be soaked for 10 minutes so as to further remove impurities on the surface of the substrate; finally, rinsing the mixture for 5 minutes by using ultrapure water and drying the mixture for later use.
(2) Preparing a displacement reaction solution according to the following formula: 8g/L rhodium sulfate and 25g/L ammonium chloride, adding ammonia water by taking deionized water as a solvent, and adjusting the amount of the ammonia water to adjust the pH value of the replacement reaction liquid to be between 8.5 and 9.5, for example, setting the pH value to be 9.5.
(3) Immersing the flat nickel treated in the step (1) in 4L of the replacement reaction solution prepared in the step (2).
(4) At room temperature, continuously introducing compressed air into the bottom of the reaction vessel, and stirring with air at a flow rate of 800L/min/m 2 After 20 hours, the aeration was stopped, and the cathode electrode was taken out and rinsed with ultrapure water for 5 minutes and then dried at 90 ℃.
It should be noted that the parameters used in the above embodiments are mostly the end values of various process parameter ranges, such as the concentration range of the noble metal salt, the concentration range of ammonium chloride, the range of the air flow rate of the introduced compressed air, the range of the drying temperature, and the like. The ranges of the various process parameters are obtained through experimental research, and in some other non-illustrated embodiments of the present application, the end values and all intermediate values of the ranges of the various process parameters can be used to prepare the high-efficiency cathode electrode by the preparation method of the present application under a preset condition, which can effectively solve the technical problems of high power consumption and the like when the general cathode electrode for hydrogen production by electrolyzing water is applied to the hydrogen production industry.
In summary, the present application provides a method for preparing a cathode electrode for hydrogen production by water electrolysis and a reaction solution, wherein the reaction solution is prepared by a specific formula, a nickel substrate is immersed in the reaction solution for a displacement reaction, and compressed air is introduced into the reaction solution for air stirring, and the cathode electrode for hydrogen production by water electrolysis with an internal matrix of metallic nickel and a surface of noble metal is prepared by a simple process and a small amount of noble metal consumption.
The above-mentioned embodiments only express one implementation mode of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (12)

1. A method for preparing a cathode electrode for hydrogen production by water electrolysis is characterized by comprising the following steps:
providing a reaction solution: 4-8 g/L of noble metal salt and 15-25 g/L of ammonium chloride, and adding ammonia water to adjust the pH value of the reaction solution to 8.5-9.5 by taking deionized water as a solvent;
immersing a nickel matrix in the reaction solution for a displacement reaction, introducing compressed air into the reaction solution for air stirring at the same time to ensure that the noble metal precipitated by the reaction is attached to the surface of the nickel matrix to form a noble metal layer, taking out the prepared cathode electrode, cleaning and drying, wherein the nickel matrix is subjected to surface cleaning treatment before being immersed in the reaction solution.
2. The method of claim 1, wherein the noble metal is platinum, palladium, or rhodium.
3. The method according to claim 1, wherein the noble metal salt is diammineplatinum nitrite, dichlorodiaminopalladium, tetraaminepalladium dichloride, rhodium sulfate or rhodium chloride.
4. The method of claim 1, wherein the geometric area of the nickel matrix and the volume of the reaction solution are matched in a ratio of 1m during the displacement reaction 2 ：20～40L。
5. The method as claimed in claim 1, wherein the flow rate of the compressed air introduced for air agitation is set to 500 to 800L/min/m 2 "m" in the unit of the gas flow 2 "means the area of the liquid surface of the reaction solution after the reaction solution is placed in the reaction vessel.
6. The method according to claim 1, wherein the time for the air agitation is set to 10 to 20 hours.
7. The method of claim 1, wherein a drying temperature for drying the prepared cathode electrode is set to 60 to 90 ℃.
8. The method according to claim 1, wherein before immersing the nickel substrate in the reaction liquid, the nickel substrate is immersed in an alkali solution to perform degreasing and degreasing treatment, then washed with ultrapure water, then immersed in an acid solution, and then dried after rinsing with ultrapure water.
9. The method of claim 8, wherein the acid solution is an HCl solution at a concentration of 2 to 4M; the alkali solution is KOH solution, and the concentration is 1-5M.
10. The method of any one of claims 1-9, wherein the nickel substrate is flat nickel, a woven mesh of nickel, or foamed nickel.
11. A reaction solution for preparing a cathode electrode for hydrogen production by water electrolysis, which is used for performing a displacement reaction with a nickel substrate to form a noble metal layer on the surface of the nickel substrate, wherein the reaction solution comprises: 4-8 g/L of noble metal salt, 15-25 g/L of ammonium chloride, and adjusting the pH value of the reaction solution to 8.5-9.5 by ammonia water by taking deionized water as a solvent.
12. The reaction solution for producing a cathode electrode for hydrogen production by electrolysis of water according to claim 11, wherein the noble metal is platinum, palladium or rhodium.
CN202210986654.0A 2022-08-17 2022-08-17 Method for preparing cathode electrode for hydrogen production by electrolyzing water and reaction solution Pending CN115233237A (en)

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