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Composite material of nitrogen doped three-dimensional graphene supported nano silver and preparation method thereof

A composite material, graphene technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reducing the excellent properties of graphene, prone to stacking and agglomeration, and achieve easy reaction process. Control, catalytic activity enhancement, and spin density enhancement effects

Active Publication Date: 2017-10-13
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong π-π interaction between graphene sheets, it is easy to stack and agglomerate, which greatly reduces the excellent properties of graphene.

Method used

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  • Composite material of nitrogen doped three-dimensional graphene supported nano silver and preparation method thereof
  • Composite material of nitrogen doped three-dimensional graphene supported nano silver and preparation method thereof
  • Composite material of nitrogen doped three-dimensional graphene supported nano silver and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Preparation of graphene materials:

[0021] With graphite paper as anode, carbon rod as cathode, and concentrated sulfuric acid (concentration 98%) as electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A; after 24 hours of peeling, the electrolyte is diluted 10 times with distilled water, and the solution is After cooling to room temperature, use a high-speed centrifuge at 12,000 rpm to separate and filter. The filtered powder was fully washed with distilled water to neutrality, and dried at 50° C. under a vacuum of 100 Pa to obtain graphene oxide powder.

[0022] 2. Preparation of nitrogen-doped three-dimensional graphene-supported nano-silver composite:

[0023] Add 200 mg of the above graphene oxide powder into 100 mL of distilled water, and make a suspension after ultrasonic dispersion for 60 minutes; add 20 mL of ethylenediamine solution into the graphene oxide suspension, ultrasonically disperse for 10 minutes, then weigh 42...

Embodiment 2

[0026] 1. Preparation of graphene materials:

[0027] Using graphite paper as anode, carbon rod as cathode, and concentrated sulfuric acid (98% concentration) as electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A. After stripping for 24 hours, the electrolyte solution was diluted 10 times with distilled water, and after the solution was cooled to room temperature, it was separated and filtered by a high-speed centrifuge at 12,000 rpm. The filtered powder was fully washed with distilled water to neutrality, and dried at 50° C. under a vacuum of 100 Pa to obtain graphene oxide powder.

[0028] 2. Preparation of nitrogen-doped three-dimensional graphene-loaded nano-silver composite:

[0029] Take 100 mg of the above-mentioned graphene oxide powder and add it into 100 mL of distilled water, and make a suspension after ultrasonic dispersion for 60 min. Take 10mL of ethylenediamine solution and add it to the graphene oxide suspension, ultrason...

Embodiment 3

[0032] 1. Preparation of graphene materials:

[0033] Using graphite paper as anode, carbon rod as cathode, and concentrated sulfuric acid (98% concentration) as electrolyte, the graphite paper is oxidized and peeled off at a constant current of 0.2A. After stripping for 24 hours, the electrolyte solution was diluted 10 times with distilled water, and after the solution was cooled to room temperature, it was separated and filtered by a high-speed centrifuge at 12,000 rpm. The filtered powder was fully washed with distilled water to neutrality, and dried at 50° C. under a vacuum of 100 Pa to obtain graphene oxide powder.

[0034] 2. Preparation of nitrogen-doped three-dimensional graphene-supported nano-silver composite:

[0035] Take 120 mg of the above-mentioned graphene oxide powder and add it to 100 mL of distilled water, and make a suspension after ultrasonic dispersion for 60 minutes; take 15 mL of ethylenediamine solution and add it to the graphene oxide suspension, ult...

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Abstract

The invention provides a composite material of nitrogen doped three-dimensional graphene supported nano silver, wherein the composite material is a porous three-dimensional network structure which is formed by the self assembly of a graphene sheet with a nitrogen doping amount of 2.3 to 8.8% under the action of temperature and pressure; silver particles with a particle size of 80 to 120nm are evenly dispersed on the three-dimensional grapheme surface and the loading capacity of the composite material is 12 to 51%. The preparation method of the composite material comprises the following steps: taking graphite paper as an anode, a carbon rod as a cathode, concentrated sulfuric acid as electrolyte, performing oxidization and exfoliation, and preparing a thin layer graphene oxide material; and orderly adding ethanediamine and silver nitrate into graphene oxide suspension, performing an one step hydrothermal reaction, and then drying, thus the composite material is obtained. The preparation method of the composite material of the nitrogen doped three-dimensional graphene supported nano silver provided by the invention is simple in operation and low in cost; in an electrocatalysis process, a porous structure of the composite material greatly increases a three-phase reaction interface, thereby improving the mass transfer rate of oxygen; and meanwhile, the composite material has higher electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a composite material. Background technique [0002] Metal-air batteries have attracted widespread attention due to their advantages of low cost, no pollution, and high specific energy. Among them, the catalytic effect of the battery catalyst directly determines the various performance indicators of the battery. Precious metals have many excellent properties such as high catalytic activity, high temperature resistance, oxidation resistance, corrosion resistance and good stability. Among them, silver nanomaterials are an emerging catalyst material because of their good electrical conductivity and stable physical and chemical properties. The cost of silver such as gold, palladium and so on is lower. However, silver nanoparticles are easy to agglomerate during the preparation process, which greatly reduces the catalytic activity. Graphene is a ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCB82Y30/00H01M4/88H01M4/9041H01M4/9083Y02E60/50
Inventor 胡婕靳凤丹石自伟卢本乾黄浩
Owner YANSHAN UNIV
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