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Method for preparing Ni@C or Co@C core-shell nanoparticles

A nanoparticle, core-shell technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limited commercial production, high reaction temperature, long reaction time, etc., and achieve low cost , Simplify the preparation process, and the effect of simple process

Inactive Publication Date: 2014-12-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sol-gel method currently used for preparation limits commercial production because it requires longer reaction time and higher reaction temperature.

Method used

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  • Method for preparing Ni@C or Co@C core-shell nanoparticles
  • Method for preparing Ni@C or Co@C core-shell nanoparticles
  • Method for preparing Ni@C or Co@C core-shell nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of NiC core-shell nanoparticles, the steps are as follows:

[0019] 1) Add 1.5 g NiCl 2 ·6H 2 O was added to an aqueous solution of isopropanol consisting of 20 mL of water and 20 mL of isopropanol, and under continuous stirring, 0.6 g of nitrogen triacetic acid (NTA) was added and stirred at room temperature for 1 hour to obtain a mixed solution;

[0020] 2) Transfer the above mixed solution into a reaction kettle, place the reaction kettle in a blast drying oven at 180 °C for 6 hours, then lower it to room temperature, separate the product and wash it with water and ethanol three times in turn, and after vacuum drying, get Precursor Ni-NTA;

[0021] 3) The above precursor Ni-NTA was placed in a tube furnace, heated to 500 °C at a heating rate of 2 °C / min and kept for 2 hours to obtain the black product NiC core-shell nanoparticles.

[0022] figure 1 The XRD pattern and SEM pattern of the NiC core-shell nanoparticles prepared in Example 1, in t...

Embodiment 2

[0024] A preparation method of CoC core-shell nanoparticles, the steps are as follows:

[0025] 1) 1.5 g CoCl 2 ·6H 2 O was added to an aqueous solution of isopropanol consisting of 20 mL of water and 20 mL of isopropanol, and under continuous stirring, 0.6 g of nitrogen triacetic acid (NTA) was added and stirred at room temperature for 1 hour to obtain a mixed solution;

[0026] 2) Transfer the above mixed solution into a reaction kettle, place the reaction kettle in a blast drying oven at 180 °C for 6 hours, then lower it to room temperature, separate the product and wash it with water and ethanol three times in turn, and after vacuum drying, get Precursor Co-NTA;

[0027] 3) The above precursor Co-NTA was placed in a tube furnace, heated to 500 °C at a heating rate of 2 °C / min and kept for 2 hours to obtain the black product CoC core-shell nanoparticles.

[0028] figure 2 XRD pattern and SEM pattern of the CoC core-shell nanoparticles prepared for Example 2, in the fig...

Embodiment 3

[0030] A preparation method of NiC core-shell nanoparticles, the steps are as follows:

[0031] 1) Add 1.5 g NiCl 2 ·6H 2 O was added to an aqueous solution of isopropanol consisting of 20 mL of water and 20 mL of isopropanol, and under continuous stirring, 0.6 g of nitrogen triacetic acid (NTA) was added and stirred at room temperature for 1 hour to obtain a mixed solution;

[0032] 2) Transfer the above mixed solution into a reaction kettle, place the reaction kettle in a blast drying oven at 180 °C for 6 hours, then lower it to room temperature, separate the product and wash it with water and ethanol three times in turn, and after vacuum drying, get Precursor Ni-NTA;

[0033] 3) The above precursor Ni-NTA was placed in a tube furnace, heated to 600 °C at a heating rate of 2 °C / min and kept for 2 hours to obtain the black product NiC core-shell nanoparticles.

[0034] The XRD pattern, SEM pattern and TEM pattern of the prepared NiC core-shell nanoparticles are similar to ...

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Abstract

The invention relates to a method for preparing Ni@C or Co@C core-shell nanoparticles. The method comprises the steps: (1) adding nickel chloride or cobalt chloride into an isopropanol aqueous solution, adding nitrilotriacetic acid, and stirring for 1 hour at room temperature, so as to obtain a mixed solution; (2) transferring the mixed solution to a reactor, placing the reactor into an air-blasting drying oven, carrying out heat preservation for 6 hours at the temperature of 180 DEG C, cooling, then, separating a product, cleaning and drying in vacuum, so as to obtain a precursor; (3) putting the precursor into a tubular furnace, heating to the temperature of 500-600 DEG C at the heating rate of 2 DEG C / min, and carrying out heat preservation for 2 hours, thereby obtaining a black product, namely the Ni@C or Co@C core-shell nanoparticles. The method has the advantages that the method is simple in process, low in energy consumption, low in cost and free from environmental pollution, and the in-situ synthesis of the Ni@C or Co@C core-shell nanoparticles is realized; the prepared core-shell nanoparticles have porous structures and are larger in specific surface area and narrower in pore size distribution, thereby being a promising catalyst or energy storage material.

Description

technical field [0001] The invention relates to a method for preparing metal carbon core-shell nanoparticles, in particular to a method for preparing NiC or CoC core-shell nanoparticles. Background technique [0002] Transition metals are an important class of multifunctional materials, and their applications in catalysis and magnetism have attracted wide attention. However, simple transition metals are easily oxidized in air, which limits their wide application. At present, the commonly used solution is carbon coating to prevent the oxidation of the transition metal element and also have a positive effect on its performance. However, the currently used sol-gel method limits commercial production because it requires a long reaction time and high reaction temperature. Therefore, it is of great significance to develop an easy-to-operate, low-cost, and environmentally friendly method for in situ synthesis of MC (M=Ni, Co) core-shell nanoparticles. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
Inventor 王一菁焦丽芳袁华堂安翠华王俊婷黄娅楠陈程成
Owner NANKAI UNIV
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