Preparation and application of nitrogen-doped graphene-carbon nanohorn composites

A nitrogen-doped graphene and carbon nanohorn technology, which is applied in the preparation/purification of carbon, graphite, hybrid capacitor electrodes, etc., can solve the problems of graphene nanosheets being easy to reunite and electrochemical performance, and achieve high yield, The effect of expanding the application field and high specific surface area

Inactive Publication Date: 2017-12-08
FUZHOU UNIV
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to provide the preparation and application of a nitrogen-doped graphene-carbon nanohorn composite material, which belongs to the technical field of preparation of graphene-based composite materials, overcomes and solves the problem of graphene nanohorn existing in the existing graphene preparation method. The composite material has the characteristics of good dispersion, low cost and excellent electrochemical performance.

Method used

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  • Preparation and application of nitrogen-doped graphene-carbon nanohorn composites
  • Preparation and application of nitrogen-doped graphene-carbon nanohorn composites
  • Preparation and application of nitrogen-doped graphene-carbon nanohorn composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of graphene oxide: Take 1.0 g of expandable graphite and put it into a round bottom flask, then add 6.0 g of potassium permanganate, then add 120 mL of concentrated sulfuric acid and 14 mL of concentrated phosphoric acid into the round bottom flask in turn; Heat the oil bath to 50 °C, put the rotor into the flask, install the condenser on the flask, and put it into the oil bath for 24 hours of magnetic stirring; take it out from the oil bath; Ice bath in a beaker, add 30 wt% hydrogen peroxide dropwise and stir until all the reactants turn golden yellow; after cooling to room temperature, wash with deionized water, suction filter and centrifuge repeatedly until the solution is neutral; pour the solution In the evaporating dish, put it into a drying oven for drying; after drying, grind it to obtain graphene oxide, and bottle it for later use;

[0041] (1) Dissolve 200 mg of graphene oxide powder in deionized water to prepare a dispersion with a concentration o...

Embodiment 2

[0045] The preparation of graphene oxide is the same as in Example 1.

[0046] (1) Dissolve 200 mg of graphene oxide powder in deionized water to prepare a dispersion with a concentration of 5.58 mg / mL, add 30 mg of sodium lignosulfonate after ultrasonic dispersion for 30 min, and add 20 g of melamine after ultrasonic dispersion for 30 min As a nitrogen dopant, add 5 mg carbon nanohorns to obtain a mixture of graphene oxide-lignosulfonic acid-melamine-carbon nanohorns; add deionized water to 100 mL, sonicate for 1 h, and pour it into an evaporating dish , dried in an oven at 60 °C to obtain a black solid powder, and then ground to obtain a precursor;

[0047] (2) Put the dried black precursor solid powder in (1) in a crucible, and carry out pyrolysis at 800 °C under the protection of 100 mL / min inert gas; heat up to 800 ℃, heat preservation for 120 min, and then cool with the furnace to obtain nitrogen-doped graphene-carbon nanohorn composite material, grind the sample and st...

Embodiment 3

[0050] The preparation of graphene oxide is the same as in Example 1.

[0051] (1) Dissolve 200 mg of graphene oxide powder in deionized water to prepare a dispersion with a concentration of 5.58 mg / mL, add 20 mg of cellulose sodium after ultrasonic dispersion for 30 min, and add 20 g of urea as nitrogen after ultrasonic dispersion for 30 min Dopant, then add 5 mg carbon nanohorn to obtain graphene oxide-cellulose sodium-urea-carbon nanohorn mixture; then add deionized water to 100 mL, after ultrasonication for 1 h, pour it into an evaporating dish, at 60 ℃ oven drying to obtain a black solid powder, and then grind to obtain a precursor;

[0052] (2) Put the dried black precursor solid powder in (1) in a crucible, and carry out pyrolysis at 700 °C under the protection of 200 mL / min inert gas; heat up to 700 ℃, heat preservation for 120 minutes, and then cool with the furnace to obtain nitrogen-doped graphene-carbon nanohorn composite materials, grind the samples and label the...

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Abstract

The invention provides a preparation method and an application of a nitrogen-doped graphene-carbon nanohorn composite material, and belongs to the field of functional carbon materials. The preparation method of the nitrogen-doped graphene-carbon nanohorn composite material comprises the steps of ultrasonically dispersing graphene oxide to form a uniform solution in the presence of a biomass raw material, adding a nitrogen source substance and a carbon nanohorn, performing ultrasonic and uniform dispersion again to obtain a graphene oxide-biomass-nitrogen source substance-carbon nanohorn mixture solution, and drying the mixture to a constant weight, thereby obtaining a nitrogen precursor mixture; and performing normal-pressure high-temperature pyrolysis on the nitrogen precursor mixture to obtain the nitrogen-doped graphene-carbon nanohorn composite material. The prepared nitrogen-doped graphene-carbon nanohorn composite material can be used for electrode materials of lithium ion batteries and supercapacitors. The preparation method is simple; and the obtained composite material is loose in structure and good in nitrogen-doped graphene nanosheet dispersity. The method provides a new way for preparing a nitrogen-doped graphene based composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene-based composite materials, and more specifically relates to the preparation and application of a nitrogen-doped graphene-carbon nanohorn composite material. Background technique [0002] Graphene has excellent electrical conductivity and high specific surface area, and is considered to be an ideal choice as an electrode material for superpolar electrical appliances. However, the existence of van der Waals force between sheets makes graphene sheets easy to reunite, which reduces the effective use of its specific surface area, and its surface lacks channels for electrolyte ions to move, which greatly limits its performance. Therefore, how to effectively solve the dispersion and surface modification of graphene has become a key scientific issue. In order to expand the application of graphene, it is often modified by doping or compounded with other materials to adjust the physical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/36H01G11/32H01G11/36C01B32/05C01B32/20
CPCH01G11/32H01G11/36H01M4/362H01M4/583H01M4/625Y02E60/10Y02E60/13
Inventor 吕秋丰王文栋林晓强
Owner FUZHOU UNIV
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