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Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application

A carbon composite material, nitrogen doping technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of unsuitable mass preparation, complex process, cumbersome process, etc., to improve the material utilization rate and increase the composite interface. , the effect of improving the preparation efficiency

Active Publication Date: 2022-01-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of depositing magnetic loss agents on existing templates is generally cumbersome and complicated, and is not suitable for mass production. Therefore, it is imperative to seek a carbon-based metal composite material with a simple preparation process.

Method used

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  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application
  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application
  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application

Examples

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Effect test

Embodiment 1

[0031] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0032] First, 0.005molNiSO 4 ·6H 2 O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0033] in N 2 Under atmosphere, P-Ni / C was sintered at 700°C (heating rate 5°C / min...

Embodiment 2

[0035] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0036] First, 0.005molNiSO 4 ·6H 2O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0037] in N 2 Under atmosphere, P-Ni / C was sintered at 800°C (heating rate 5°C / min)...

Embodiment 3

[0039] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0040] First, 0.005molNiSO 4 ·6H 2 O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0041] in N 2 Under atmosphere, sinter P-Ni / C at 900°C (heating rate 5°C / min) for ...

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Abstract

The invention discloses a method for preparing a hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, and relates to the technical field of electromagnetic absorption materials. It includes the following steps: S1, disperse water-soluble nickel salt, glucose, and hexamethylenetetramine in water solvent in sequence, and conduct a hydrothermal reaction at 170-190°C for 20-36 hours to obtain a nickel / carbon composite; S2, in a nitrogen atmosphere Under the atmosphere, the nickel / carbon composite obtained in S1 was sintered at 700-900°C for 2-4 hours, then placed in the air atmosphere, heated to 250-350°C, and kept for 8-15 minutes to obtain the hollow flower-shaped nitrogen Doped nickel oxide / nickel / carbon composite. The present invention adopts precursor pyrolysis to convert porous carbon / metal composite material, which is not only beneficial to the porous carbon framework of electromagnetic wave reflection, but also uniformly introduces nano-metal particles into the framework, which increases the composite interface and is conducive to improving impedance matching and increasing absorption bandwidth. .

Description

technical field [0001] The invention relates to the technical field of electromagnetic absorption materials, in particular to a hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, a preparation method and an application. Background technique [0002] With the discovery and rapid development of electromagnetic wave technology, it has provided many conveniences for modern life. Thanks to electromagnetic wave technology, we can use mobile phones, microwave ovens, and X-rays. In the military field, satellite communications, radio waves, radar, medical treatment and weaponry are all inseparable from electromagnetic waves. But everything has two sides. While electromagnetic waves bring us convenience, they will also cause electromagnetic pollution to the environment. High-frequency electromagnetic waves will also cause certain hidden dangers to the human body and cause electromagnetic interference to electronic devices. Generally speaking, electroma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 梁瑾孔杰赵彬男陈军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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