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Nitrogen-doped graphene-metal oxide nanocomposite material as well as preparation method and application thereof

A technology of nitrogen-doped graphene and nanocomposite materials, applied in the field of nanomaterials, can solve the problems of large particle size, uneven growth of metal oxide particles, low nitrogen doping content, etc., and achieve uniform particle size and operability And the effect of good repeatability and simple process

Active Publication Date: 2016-11-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies in the prior art that the nitrogen doping content in the carrier of the composite material is not high, the in-situ growth of metal oxide particles on the graphene surface is uneven, and the particle size is large, and provide a A nitrogen-doped graphene-metal oxide nanocomposite material, in which metal oxide nanometers are uniformly grown on the surface of nitrogen-doped graphene in situ

Method used

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  • Nitrogen-doped graphene-metal oxide nanocomposite material as well as preparation method and application thereof
  • Nitrogen-doped graphene-metal oxide nanocomposite material as well as preparation method and application thereof
  • Nitrogen-doped graphene-metal oxide nanocomposite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation:

[0042] S1. Measure 200ml 0.5mg / ml graphene oxide aqueous solution and place it in a 250ml triangular beaker, then add 8ml 50wt% cyanamide aqueous solution, stir evenly, react at 90°C for 24h, filter the reaction product with deionized water Washing and drying to obtain nitrogen-doped graphene.

[0043] S2. Weigh 30mg of nitrogen-doped graphene, add it to 160ml of absolute ethanol for ultrasonic dispersion, and then take 0.07mmol of TiCl 4 , dissolved in 8ml of absolute ethanol, added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was uniformly dispersed, slowly added 4ml of deionized water, and then transferred the dispersion to the reaction kettle for 120 ℃ reaction 2h.

[0044] S3. The reaction product is naturally cooled, filtered, washed, and dried at 60° C. to obtain a nitrogen-doped graphene-titanium dioxide nanocomposite material.

[0045] 2. Characterization and performance testing:

[0046] Performance tes...

Embodiment 2

[0051] S1. Weigh 100 mg of partially reduced graphene and place it in a 250 ml conical beaker, add 200 ml of deionized water, and ultrasonically disperse evenly. Then add 4 g of melamine, stir evenly, react at 200° C. for 0.5 h, filter the reaction product with suction, wash with deionized water, and dry to obtain nitrogen-doped graphene.

[0052] S2. Weigh 30mg of nitrogen-doped graphene, ultrasonically disperse it into 160ml of absolute ethanol, and then take 0.7mmol of SnCl 4 , dissolved in 8ml of absolute ethanol, then added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was uniformly dispersed, then slowly added 4ml of deionized water, and then transferred the dispersion to the reaction kettle Reaction at 120°C for 2h.

[0053] S3. The reaction product is naturally cooled, then filtered, washed, and dried at 100° C. to obtain a solvothermally synthesized nitrogen-doped-tin dioxide nanocomposite material.

[0054] After testing, the nitr...

Embodiment 3

[0056] S1. Weigh 100 mg of partially reduced graphene and place it in a 250 ml conical beaker, add 200 ml of deionized water, and ultrasonically disperse evenly. Then add 4 g of urea, stir evenly, react at 90° C. for 48 hours, filter the reaction product with suction, wash with deionized water, and dry to obtain nitrogen-doped graphene.

[0057] S2. Weigh 30mg of nitrogen-doped graphene and ultrasonically disperse it into 160ml of absolute ethanol, then take 0.3mmol of FeCl 3 ·6H 2 O, dissolved in 8ml of absolute ethanol, then added to the dispersed nitrogen-doped graphene solution, magnetically stirred until it was uniformly dispersed, then slowly added 4ml of deionized water, and then transferred the dispersion to the reaction kettle React at 120°C for 2h.

[0058] S3. The reaction product is naturally cooled, then suction filtered, washed, and dried at 80° C. to obtain a solvothermally synthesized nitrogen-doped graphene-ferric oxide nanocomposite material.

[0059] Afte...

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Abstract

The invention discloses a nitrogen-doped graphene-metal oxide nanocomposite material as well as a preparation method and application thereof. The nitrogen-doped graphene-metal oxide nanocomposite material is obtained by performing reaction on nitrogen-doped graphene and a metal salt in an organic solvent in a solvothermal way, wherein the nitrogen-doped graphene is obtained by performing reaction on oxidized graphene or partially-reduced graphene and a nitrogen-enriched substance in a water solution. The nitrogen-doped graphene-metal oxide nanocomposite material is simple in process, relatively low in cost, and good in operability and repeatability; by the preparation method, the problems that the nitrogen doping content of a carrier in the composite material is not high, in-situ growth of metal oxide particles on the surface of the graphene is not uniform and the particle size is large are solved; the nitrogen-doped graphene-metal oxide nanocomposite material can be applied to lithium ion batteries and supercapacitors on a large scale.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and more specifically relates to a nitrogen-doped graphene-metal oxide nanocomposite material and its preparation method and application. Background technique [0002] Graphene has been widely concerned in many fields because of its large specific surface area, high thermal conductivity and strong Young's modulus, especially in the field of lithium-ion batteries, graphene is combined with other substances for doping, such as boron , nitrogen, phosphorus, etc. doping, has achieved excellent electrical properties, graphene provides a highly efficient conductive network, and it has a higher stability of the substance loaded, so that the graphene-based composite material shows more High lithium storage capacity and cycle stability. Among the many dopants, nitrogen-doped graphene has received the most attention. Compared with undoped graphene, nitrogen-doped graphene has more active sites, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01G11/24H01G11/36H01G11/46H01G11/86B82Y30/00
CPCB82Y30/00H01G11/24H01G11/36H01G11/46H01G11/86H01M4/366H01M4/48H01M4/587Y02E60/10Y02E60/13
Inventor 李运勇朱俊陆黄观尚郑勇华张海燕
Owner GUANGDONG UNIV OF TECH
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