Method for preparing high-efficiency long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis

A molybdenum alloy and porous nickel technology, applied in the field of high-efficiency and long-life porous nickel-molybdenum alloy preparation, can solve the problems of few active sites, small electrode specific surface area, poor stability, etc., and achieve a small Tafel slope value and a large hydrogen evolution current. The effect of excellent density and electrical conductivity

Inactive Publication Date: 2019-09-10
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

However, there are still problems such as poor conductivity, few active sites, and poor stability, which limit its replacement of Pt noble metal catalysts and cannot achieve commercial applications.
At present, the preparation of base metal catalyst electrodes for hydrolysis hydrogen usually uses traditional insulating binders to fix the active materials or directly deposit the active materials on the substrate, which leads to a further reduction in the conductivity of the electrode active materials and the contact area between the electrolyte and the active materials. reduction, active substances are easy to fall off from the matrix under strong hydrogen evolution conditions, etc., making the electrocatalytic activity and stability of the electrode still difficult to meet the actual use requirements of oxygen evolution electrodes for water electrolysis hydrogen production
In addition, the preparation of porous base metal catalyst electrodes by vacuum or atmosphere (the method used in this project belongs to atmosphere sintering) sintering method has developed rapidly in recent years. Due to the limitations of sintering methods and pore-forming agents, it is difficult to obtain ultra-fine pores, making the specific surface area of ​​the electrode Small, hydrogen evolution electrocatalytic activity is still low

Method used

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  • Method for preparing high-efficiency long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis
  • Method for preparing high-efficiency long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis
  • Method for preparing high-efficiency long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis

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Experimental program
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Effect test

Embodiment 1

[0019] Nickel and molybdenum powders are prepared at an atomic ratio of 1:3, and then Mg powder is added as a pore-forming agent, and the mass percentage of Mg powder is 10%. Then use a tablet press to press into a billet, wherein the pressing pressure is 600 MPa, and the holding time is 30 seconds. Then place the obtained sample in an alumina crucible, and then put the crucible into a tube-type sintering furnace; then fill the tube with argon gas with a purity of 99.999%, and control the output power of the tube-type sintering furnace at a rate of 20°C / min. The heating rate was heated to 900°C, and the temperature was maintained for 30 minutes. Then the tubular sintering furnace was closed, and the sample was cooled with the furnace to obtain a porous nickel-molybdenum alloy that can be used as a cathode material for hydrogen production by electrolysis of water.

[0020] Microstructure and electrolytic performance analysis:

[0021] from figure 1 It can be seen that there a...

Embodiment 2

[0026] Nickel and molybdenum powders are prepared at an atomic ratio of 3:1, and then Mg powder is added as a pore-forming agent, and the mass percentage of Mg powder is 13%. Then use a tablet press to press into a billet, wherein the pressing pressure is 700 MPa, and the holding time is 30 seconds. Then place the obtained sample in an alumina crucible, and then put the crucible into a tubular sintering furnace; then fill the tube with argon gas with a purity of 99.999%, and control the output power of the tubular sintering furnace at a rate of 30°C / min. The heating rate was heated to 1000°C, and the temperature was maintained for 40 minutes. Then the tubular sintering furnace was closed, and the sample was cooled with the furnace to obtain a porous nickel-molybdenum alloy that can be used as a cathode material for hydrogen production by electrolysis of water.

Embodiment 3

[0028] Nickel and molybdenum powders are prepared at an atomic ratio of 5:1, and then Mg powder is added as a pore-forming agent, and the mass percentage of Mg powder is 15%. Then use a tablet press to press into a billet, wherein the pressing pressure is 800 MPa, and the holding time is 30 seconds. Then place the obtained sample in an alumina crucible, and then put the crucible into a tube-type sintering furnace; then fill the tube with argon gas with a purity of 99.999%, and control the output power of the tube-type sintering furnace at a rate of 40°C / min. The heating rate was heated to 1100°C, and the temperature was maintained for 50 minutes. Then the tubular sintering furnace was closed, and the sample was cooled with the furnace to obtain a porous nickel-molybdenum alloy that can be used as a cathode material for hydrogen production by electrolysis of water.

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Abstract

The invention discloses a method for preparing a high-efficiency long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis. The method adopts a powder metallurgy atmosphere sintering method, Mg powder is used as a pore-forming agent, ultra-fine Ni, Mo powder and Mg powder with different content ratios are subjected to ball milling and then press forming, and the porousnickel-molybdenum alloy is prepared by sintering in a high temperature atmosphere. The porous nickel-molybdenum alloy has the advantages of three-dimensional open-cell structure, high permeability, and large specific surface area, and multi-component composite hydroxide active sites with high catalytic performance can be formed on the surface of the alloy in a long-term hydrogen evolution processin an alkaline solution, so that the alloy is suitable for hydrogen evolution electrodes for hydrogen production by water electrolysis.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency and long-life porous nickel-molybdenum alloy for hydrogen production by water electrolysis, and specifically belongs to the technical field of porous nickel-molybdenum alloy materials. Background technique [0002] Noble metals (Pt) have been widely used in electrolysis of water to produce hydrogen due to their high electrochemical activity due to their peak potential close to zero millivolts in the hydrogen evolution reaction. However, from the perspective of cost savings, these noble metals Elements are expensive and have limited reserves on the earth, making it impossible to achieve sustainable development. The development of inexpensive catalysts with excellent performance has become a research hotspot in recent years. In recent years, people have extensively studied the performance of cheap and easy-to-obtain hydrogen evolution catalysts such as alloys of transition metals, sulfide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04B22F3/10B22F3/11C22C27/04C25B1/04C25B11/03
CPCB22F3/1007B22F3/1125B22F2999/00C22C27/04C25B1/04C25B11/031C25B11/061B22F2201/11Y02E60/36
Inventor 叶志国商鹏飞吴显通彭新元周益帆王昕孙学梅李多生
Owner NANCHANG HANGKONG UNIVERSITY
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