Preparation method of nickel phosphide foam net with high mechanical stability and application of nickel phosphide foam net in water electrolysis for hydrogen production
By adjusting the phosphating reaction conditions, a nickel phosphide foam mesh with strong mechanical stability was prepared, which solved the problems of high cost of adding precious metals and poor mechanical stability in the electrolysis of water to produce hydrogen. This achieved low-cost, high-efficiency preparation and high catalytic activity.
Patent Information
- Application Number
- CN202411227410.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2026-03-10
AI Technical Summary
Existing nickel foam mesh exhibits good catalytic activity under high temperature and high pressure conditions, but the cost of adding precious metals is high and the loading is reduced. Nickel phosphide foam mesh also has poor mechanical stability, which affects its application in hydrogen production through water electrolysis.
By placing red phosphorus powder upstream of the nickel foam mesh, controlling the temperature rise of the tube furnace and introducing nitrogen gas, adjusting the phosphating reaction conditions, and reducing the calcination temperature and time, a nickel phosphide foam mesh with strong mechanical stability can be prepared.
This study achieved low-cost and efficient preparation of nickel phosphide foam with strong mechanical stability, maintaining catalytic activity, reducing preparation costs and time, and ensuring the mechanical stability of the material.
Smart Images
Figure CN121629440A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydrogen production through water electrolysis, specifically to a method for preparing a nickel phosphide foam mesh with high mechanical stability and its application in hydrogen production through water electrolysis. Background Technology
[0002] For electrode materials used in water electrolysis for hydrogen production, most domestic and international companies currently use nickel-based compounds, with nickel foam mesh being the most common. Nickel foam mesh exhibits extremely high stability; however, it only demonstrates certain catalytic activity under high temperature and pressure conditions. To improve the catalytic activity of nickel foam mesh in water electrolysis, the addition of precious metals is typically employed. However, precious metals are expensive, and their loading gradually decreases over time, leading to a gradual decline in catalytic activity. In conclusion, developing a novel catalyst for water electrolysis to produce hydrogen that can replace nickel foam mesh shows promising application prospects.
[0003] Numerous studies have demonstrated that nickel phosphide possesses excellent catalytic activity for hydrogen production through water electrolysis, leading to the development of various types of self-supporting nickel phosphide foam meshes. However, nickel foam meshes require different phosphating processes to transform into nickel phosphide foam meshes, and some phosphating treatments necessitate high-temperature assistance, resulting in poor mechanical stability. In the process of assembling the catalyst into an electrolyzer, good mechanical properties would bring significant feasibility and convenience. Therefore, developing a nickel phosphide foam mesh with strong mechanical stability as a cathode for hydrogen production through water electrolysis has considerable application value. Summary of the Invention
[0004] Based on the above problems, this invention proposes a method for preparing nickel phosphide foam mesh with strong mechanical stability and its application in hydrogen production by water electrolysis, so as to enhance the mechanical properties of nickel phosphide foam mesh and increase its practical application potential.
[0005] To achieve the above objectives, the present invention provides a method for preparing a nickel phosphide foam mesh with high mechanical stability and its application in hydrogen production through water electrolysis, comprising the following steps:
[0006] S1: Place the nickel foam mesh in the center of the heating zone of the horizontal tube furnace, and then place the red phosphorus powder upstream of the nickel foam mesh;
[0007] S2: Clean the atmosphere inside the tubular furnace, then continuously introduce nitrogen;
[0008] S3: Heat the heating zone of the tube furnace and maintain it for several minutes, then allow the sample to cool naturally to obtain a nickel phosphide foam with strong mechanical stability.
[0009] S4: A hydrogen production device for water electrolysis is constructed using a nickel phosphide foam mesh with high mechanical stability as the cathode, a graphite rod as the anode, and a potassium hydroxide solution as the electrolyte.
[0010] Furthermore, the purity of the red phosphorus powder mentioned in step S1 is 98.5%.
[0011] Further, in step S1, red phosphorus powder is placed 5-10 cm upstream of the nickel foam mesh.
[0012] Furthermore, the nitrogen gas in step S2 has a purity of 99.9% and a flow rate of 25-30 sccm.
[0013] Furthermore, in step S3, the heating zone of the tubular furnace is heated to 460-480°C and maintained for 4-10 minutes.
[0014] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:
[0015] This invention provides a method for preparing nickel phosphide foam with strong mechanical stability and its application in hydrogen production through water electrolysis. Compared with traditional preparation methods, the calcination temperature is lower, the calcination time is shorter, and the preparation cost and time are effectively reduced.
[0016] This invention adjusts the phosphating reaction conditions, lowers the calcination temperature, and shortens the calcination time, ensuring both the formation of nickel phosphide on the surface of the foam mesh and the retention of metallic nickel inside the foam mesh. This is key to ensuring the high catalytic activity and strong mechanical stability of the nickel phosphide foam mesh. Attached Figure Description
[0017] Figure 1 Scanning electron microscope image of nickel phosphide foam mesh provided in an embodiment of the present invention;
[0018] Figure 2 X-ray diffraction pattern of nickel phosphide foam mesh provided in an embodiment of the present invention;
[0019] Figure 3 The polarization curve of the nickel phosphide foam mesh provided in the embodiment of the present invention. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] This invention proposes a method for preparing a nickel phosphide foam mesh with high mechanical stability and its application in hydrogen production through water electrolysis, comprising the following steps:
[0023] S1: Place the nickel foam mesh in the center of the heating zone of the horizontal tube furnace, and then place the 98.5% pure red phosphorus powder 10cm upstream of the nickel foam mesh;
[0024] S2: Clean the atmosphere inside the tube furnace, and then continuously introduce 99.9% pure nitrogen at a flow rate of 30 sccm;
[0025] S3: Heat the heating zone of the tube furnace to 480℃ and hold for 5 minutes, then allow the sample to cool naturally to obtain a nickel phosphide foam mesh with strong mechanical stability (see scanning electron microscope image). Figure 1 ).
[0026] S4: A hydrogen production device for water electrolysis is constructed using a nickel phosphide foam mesh with high mechanical stability as the cathode, a graphite rod as the anode, and a potassium hydroxide solution as the electrolyte.
[0027] The nickel phosphide foam mesh prepared in this embodiment exhibits strong mechanical stability, as shown in the X-ray diffraction pattern of the nickel phosphide foam mesh (see...). Figure 2 The presence of both Ni5P4 and metallic Ni crystalline phases was observed, indicating that the surface of the foam mesh has formed the active material Ni5P4, while the core of the foam mesh remains metallic nickel. The presence of the surface-active material ensures the catalytic performance of the material, while the presence of metallic nickel in the center ensures the mechanical stability of the entire material. Polarization curves (see...) Figure 3 It was found that in potassium hydroxide solution, this nickel phosphide foam mesh requires only 104 mV overpotential to achieve 10 mA / cm. 2 The current density indicates that the nickel phosphide foam mesh has good hydrogen production activity in water electrolysis.
[0028] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A method for preparing a mechanically stable nickel phosphide foam mesh and its application in the production of hydrogen by electrolysis of water, characterized in that, The method comprises the following steps: S1: placing the nickel foam net in the center of the heating zone of a horizontal tube furnace, and then placing red phosphorus powder at an upstream position of the nickel foam net; S2: cleaning the internal atmosphere of the tube furnace, and then continuously introducing nitrogen; S3: heating the heating zone of the tube furnace and keeping for several minutes, and then naturally cooling the sample to obtain a mechanically stable nickel phosphide foam net; S4: constructing a water electrolysis hydrogen production device by using the mechanically stable nickel phosphide foam net as a water electrolysis hydrogen production cathode, using a graphite rod as a water electrolysis anode, and using a potassium hydroxide solution as an electrolyte.
2. The method of claim 1, wherein the nickel phosphide foam web has a mechanical stability of at least 0.5 N / mm2. The purity of the red phosphorus powder in step S1 is 98.5%.
3. The method of claim 1, wherein the nickel phosphide foam web has a mechanical stability of at least 0.5 g / cm3. In step S1, the red phosphorus powder is placed at a position 5-10 cm upstream of the nickel foam net.
4. The method of claim 1, wherein the nickel phosphide foam web has a mechanical stability of at least 0.5 g / cm3. The purity of the nitrogen in step S2 is 99.9%, and the flow rate is 25-30 sccm.
5. The method of claim 1, wherein the nickel phosphide foam web has a mechanical stability of at least 0.5 g / cm3. In step S3, the heating zone of the tube furnace is heated to 460-480°C and kept for 4-10 minutes.
6. The method of producing a mechanically stable nickel phosphide foam mesh according to claim 1, wherein In step S4, the graphite rod can be replaced by other stable water electrolysis anode materials, and the potassium hydroxide solution can be replaced by other electrolytes.
7. A nickel phosphide foam net prepared by the preparation method of claim 1.
8. A water electrolysis hydrogen production device using the nickel phosphide foam net of claim 7 as a water electrolysis hydrogen production cathode.