Method for preparing nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers

A technology of metal nanoparticles and composite materials, which is applied in the field of preparation of inorganic catalysts, can solve the problems of incapable of large-scale production, cumbersome preparation process, leaching of metal ions, etc., and achieve the effect of low cost, wide sources and stable properties

Inactive Publication Date: 2019-05-17
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the above-mentioned prior art, the present invention provides a method for preparing nitrogen-doped carbon-coated metal nanoparticle composite materials by using carbon fibers, aiming to solve the problems of cumbersome preparation process, leaching of metal ions, agglomeration and deactivation, and operating costs. Technical problems such as too high, harsh experimental conditions, and incapable of large-scale production

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  • Method for preparing nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers
  • Method for preparing nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers
  • Method for preparing nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers

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Embodiment 1

[0028] In this example, the nitrogen-doped carbon-coated metal particle composite material was prepared according to the following steps:

[0029] (1) Pretreatment of carbon fiber: weigh 0.4g carbon paper and cut it into 0.5×0.5cm 2 size, first soaked in nitric acid with a mass concentration of 32% for 3 hours, then washed with deionized water until neutral, and finally dried at 70°C for use;

[0030] (2) Precursor preparation: First, weigh 1.0 g of tannic acid and 1.0 g of ferric nitrate nonahydrate and dissolve them in 10 mL of deionized water, then add the solution of ferric nitrate nonahydrate into the tannic acid solution and stir evenly to obtain iron Ionic tannic acid viscous composite material; the treated carbon paper was added to the iron ion tannic acid viscous composite material and stirred for 1 hour; after stirring, the carbon paper was taken out and dried at 80°C to obtain the composite material precursor body;

[0031](3) Carbonization process: Weigh 1.0g of ...

Embodiment 2

[0037] The preparation method of the present embodiment is the same as that of the embodiment 1, the only difference is that in the step (1), soak in nitric acid with a mass concentration of 20% for 3 hours.

[0038] The mass of the nitrogen-doped carbon-coated iron nanoparticle composite material prepared in this example is ~0.384 g.

Embodiment 3

[0040] The preparation method of present embodiment is identical with embodiment 1, and difference is only: the quality that adds ferric nitrate nonahydrate in step (2) is 1.5g.

[0041] The mass of the nitrogen-doped carbon-coated iron nanoparticle composite material prepared in this example is ~0.392 g.

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Abstract

The invention discloses a method for preparing a nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers. The method comprises the following steps: firstly, uniformly mixing and stirring water-soluble transition metal salt and a solution of tannic acid to obtain a metal ion tannic acid viscous composite material; then adding the carbon fibers treated through nitric acid and continually stirring and drying; finally, adding a cyanamide type compound and carrying out calcination and pyrolysis in inert gas, so as to obtain a target product. According to the method disclosed by the invention, a preparation technology is simple in flow, controllable in operation and low in cost; the method has the advantages of safety, high efficiency, greenness and environment protection and the like and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of inorganic catalyst preparation, in particular to a method for preparing a nitrogen-doped carbon-coated metal particle composite material by using carbon fibers. Background technique [0002] Transition metal nitrogen-doped carbon materials are considered to be the most potential catalytic materials because of their good catalytic performance. At present, transition metal nitrogen-doped carbon materials are mainly prepared by calcination of transition metals, nitrogen elements, and carbon materials at high temperatures through chemical vapor deposition. The carbon supports include graphene, carbon nanotubes, and carbon fibers, and the nitrogen-containing precursors include ammonia. , Melamine, polyaniline, polypyrrole, etc. However, the active sites of transition metal nitrogen-doped carbon composite catalysts are prone to corrosion, dissociation and deactivation, poor stability, single pore structure, sm...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10
Inventor 姚运金高梦雪尹红玉张婕胡欢欢余茂静程卓冉毕志伟
Owner HEFEI UNIV OF TECH
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