Nickel net

Abstract

The utility model relates to a nickel net which is characterized in that the nickel net is a multi-strand stranded wire nickel net and comprises transverse stranded wires and longitudinal stranded wires, the transverse stranded wires and the longitudinal stranded wires are woven in a transverse and longitudinal staggered mode to form the nickel net, the transverse stranded wires are formed by stranding a plurality of strands of first nickel monofilaments, and the longitudinal stranded wires are formed by stranding a plurality of strands of second nickel monofilaments. Compared with a traditional nickel net weaving mode, the nickel net and the production process thereof have the advantages that the multi-strand stranded wire nickel net has higher surface area and surface roughness, and has better surface adhesion effect and fewer surface adhesion defects after spraying treatment, so that the catalytic activity of the surface of an electrode is improved, the hydrogen evolution overpotential is reduced, and the service life of the electrode is prolonged. The water electrolysis hydrogen production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a nickel mesh. Background Art

[0002] Alkaline water electrolysis hydrogen production technology is currently a relatively mature water electrolysis hydrogen production method. The alkaline water hydrogen production electrolysis device is an electrolytic cell, which is mainly composed of a strong alkaline electrolyte, a porous cathode / anode, and a diaphragm component. The widely used electrolytic cell anode material is nickel mesh, and the cathode material is a spray-treated nickel mesh. The existing nickel mesh forming method is usually to weave nickel wire of a specific diameter (commonly used 0.19 / 0.25mm) into nickel meshes of different mesh sizes as anode materials, and spray-treated nickel meshes as cathode materials. The quality of the electrode performance determines the voltage and energy consumption of the water electrolyzer, which affects the cost. The quality of industrial water electrolysis electrode materials is evaluated by service life and water electrolysis energy consumption.

[0003] The practical application of electrodes requires the following characteristics: 1. High surface area; 2. High conductivity; 3. Good electrocatalytic activity; 4. Long-term mechanical and chemical stability; 5. Small bubble precipitation; 6. High selectivity; 7. Easy to obtain and low cost; 8. Safety. Hydrogen production by water electrolysis often requires a large current density (usually greater than 4000A / square meter), so characteristics 2 and 4 are particularly important. High conductivity can reduce the energy loss caused by ohmic excitation, and high stability ensures the long life of the electrode material. Characteristics 1 and 3 are requirements for reducing the overpotential of hydrogen and oxygen evolution.

[0004] There are two main development directions for nickel-based electrodes: one is the electrode crystal structure design, that is, designing the crystal structure mainly by alloying to prepare electrode materials with high catalytic activity and stability with faster hydrogen adsorption and desorption capabilities, thereby essentially improving the inherent catalytic activity of the nickel-based electrode; the other is the electrode size structure design, that is, increasing the surface roughness of the electrode, effectively reducing the real current density of the electrochemical process of the hydrogen evolution reaction, thereby reducing the hydrogen evolution overpotential and providing more reaction active centers for the hydrogen evolution reaction.

[0005] Therefore, it is necessary to design and develop new cathode and anode electrode materials with excellent catalytic activity to reduce the cell pressure during electrolysis, which is the key to improving efficiency and reducing costs. The hydrogen evolution voltage of the electrode material woven by the current nickel mesh weaving method is between 0.6-0.8V, and it is difficult to further reduce the hydrogen evolution voltage to below 0.6V. Utility Model Content

[0006] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a nickel mesh.

[0007] The purpose of the utility model is achieved in this way:

[0008] A nickel mesh is a multi-stranded wire nickel mesh, comprising transverse strands and longitudinal strands, the transverse strands and the longitudinal strands are woven horizontally and vertically to form the nickel mesh, the transverse strands are formed by twisting multiple strands of first nickel monofilaments, and the longitudinal strands are formed by twisting multiple strands of second nickel monofilaments.

[0009] As a preference, the transverse stranded wire is formed by twisting 2 to 5 strands of first nickel monofilaments, and the longitudinal stranded wire is formed by twisting 2 to 5 strands of second nickel monofilaments.

[0010] As a preference, the transverse stranded wire is formed by twisting three first nickel monofilaments, and the longitudinal stranded wire is formed by twisting three second nickel monofilaments.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] Compared with the weaving method of traditional nickel mesh, the multi-strand twisted wire nickel mesh of the utility model has a higher surface area and surface roughness, and has better surface bonding effect and fewer surface adhesion defects after spraying treatment, thereby improving the catalytic activity of the electrode surface, reducing the hydrogen evolution overpotential, and improving the efficiency of hydrogen production by electrolysis of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the single nickel wire nickel mesh structure.

[0014] Figure 2 This is a schematic diagram of the three-strand nickel mesh structure.

[0015] Figure 3 This is a cross-sectional view of the three-strand nickel wire mesh.

[0016] in:

[0017] Transverse strands 100 , longitudinal strands 200 , first nickel monofilaments 101 , and second nickel monofilaments 102 . DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Referring to the accompanying drawings, the utility model relates to a nickel mesh, which is a multi-strand stranded nickel mesh, including a transverse stranded wire 100 and a longitudinal stranded wire 200. The transverse stranded wire 100 and the longitudinal stranded wire 200 are woven horizontally and vertically to form the nickel mesh. The transverse stranded wire 100 is formed by twisting a plurality of first nickel monofilaments 101, and the longitudinal stranded wire 200 is formed by twisting a plurality of second nickel monofilaments 201.

[0020] Preferably, the transverse stranded wire 100 is formed by twisting 2 to 5 strands of first nickel monofilaments 101 , and the longitudinal stranded wire 200 is formed by twisting 2 to 5 strands of second nickel monofilaments 201 .

[0021] More preferably, the transverse stranded wire 100 is formed by twisting three first nickel monofilaments 101 , and the longitudinal stranded wire 200 is formed by twisting three second nickel monofilaments 201 .

[0022] By using multiple strands of twisted wire with the same unit mass instead of a single strand of silk thread, the woven mesh has a higher surface area under the same unit mass, can adhere to more catalyst materials, and provide more reaction active centers for the hydrogen evolution reaction.

[0023] A nickel mesh woven from multiple strands of twisted wire is used as the electrode material, which increases the roughness of the electrode surface and improves the catalyst adhesion effect, effectively reducing the real current density of the electrochemical process of the hydrogen evolution reaction, thereby reducing the hydrogen evolution overpotential.

[0024] The following is a comparison of the main performances of single nickel wire nickel mesh and multi-stranded nickel mesh of the same unit mass:

[0025] Hydrogen evolution voltage(V) Roughness(Ra) Dropout rate (%) Single nickel wire nickel mesh 0.6-0.8 130 0.0016-0.0018 Three-strand nickel wire mesh 0.582 150 0.0013

[0026] A production process of nickel mesh:

[0027] Step 1: Forming single wire: Use three-stage vacuum melting to reduce the content of low-melting-point volatile harmful metals in the material, improve the purity of the material, fully remove the gas content in the raw materials, and improve the flexibility of the material; use the electroslag remelting process to improve the surface quality of the ingot; use constant speed and constant tension annealing to ensure the consistency of annealing performance. After the ingot is processed into a rod, it is drawn into a single wire through multiple passes.

[0028] Step 2: Twisting a single wire into multiple strands: Use a wire twisting machine to twist the nickel single wire into multiple strands of wire, and the wires will not loosen or twist after twisting.

[0029] Step 3: Netting: Use a high-precision CNC nickel mesh weaving machine to weave the twisted strands into a nickel mesh product with uniform mesh holes, smooth mesh surface and zero defects.

[0030] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A nickel mesh, characterized in that The nickel mesh is a multi-strand stranded nickel mesh, including transverse strands and longitudinal strands, which are woven horizontally and vertically to form the nickel mesh. The transverse strands are formed by twisting multiple strands of first nickel monofilaments, and the longitudinal strands are formed by twisting multiple strands of second nickel monofilaments.

2. A nickel mesh according to claim 1, characterized in that The transverse stranded wire is formed by twisting 2 to 5 strands of first nickel monofilaments, and the longitudinal stranded wire is formed by twisting 2 to 5 strands of second nickel monofilaments.

3. A nickel mesh according to claim 1, characterized in that The transverse stranded wire is formed by twisting three first nickel monofilaments, and the longitudinal stranded wire is formed by twisting three second nickel monofilaments.

Images