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Preparation method of n and s double-doped graphene-graphene nanoribbon aerogels

A graphene nanobelt and graphene technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of effective specific surface area loss, reduce specific capacitance, etc., achieve enhanced reactivity and conductivity, and improve electrical conductivity performance, improve the electrochemical performance

Active Publication Date: 2019-12-17
福建宸琦新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because the strong van der Waals force and π-π stacking interactions between graphene layers make them easy to aggregate to form a graphitic structure, which leads to the loss of effective specific surface area and lowers its specific capacitance.

Method used

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  • Preparation method of n and s double-doped graphene-graphene nanoribbon aerogels

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preparation example Construction

[0021] Preparation of graphene oxide nanoribbons:

[0022] (A) In 36 mL of concentrated H 2 SO 4 0.15 g of multi-walled carbon nanotubes (MWCNTs) was added to the solution, and after magnetic stirring for 2 h, 4 mL of H 3 PO 4 , continue stirring for 15 min; add 1.2 g KMnO 4 Then, it was transferred to an oil bath at 65 °C and stirred for 2 h. After the reaction was completed and cooled to room temperature, 100 mL of ice water (containing 5 mL of 30% H 2 o 2 ), let stand for 14 h;

[0023] (B) After standing still, pour off the supernatant, filter the remaining solution with a 220 µm microporous membrane, wash twice with 6 mL of 20% HCl; redisperse the solid obtained by suction in a 60 mL ultra Stir in pure water for 2 h and then sonicate to obtain a uniformly dispersed solution, which is added to 40 mL of 30% HCl and allowed to stand for 14 h;

[0024] (C) Suction filter with the same filter membrane and redisperse the obtained product in 40 mL of anhydrous methanol a...

Embodiment 1

[0027] A preparation method of N and S double-doped graphene-graphene nanoribbon airgel, specifically comprising the following steps:

[0028] (1) Preparation of graphene oxide nanobelts;

[0029] (2) Preparation of graphene oxide;

[0030] (3) Mix 50 mg of graphene oxide nanoribbons prepared in step (1) with 50 mg of graphene oxide prepared in step (2), add 50 mL of deionized water, and obtain a mixed solution with a concentration of 2 mg / mL after ultrasonication ;

[0031] (4) Add 0.5 mg of pyrrole and 0.5 mg of thiophene to the mixture obtained in step (3), and conduct a hydrothermal reaction at a reaction temperature of 165°C for 5 hours to obtain a hydrogel;

[0032] (5) Put the hydrogel obtained in step (4) into 2M KNO 3 In the solution, a second hydrothermal reaction is carried out, the reaction temperature is 120°C, the reaction time is 3h, after cooling to room temperature, it is filtered, washed and freeze-dried;

[0033] (6) The product obtained after freeze-dry...

Embodiment 2

[0035] A preparation method of N and S double-doped graphene-graphene nanoribbon airgel, specifically comprising the following steps:

[0036] (1) Preparation of graphene oxide nanobelts;

[0037] (2) Preparation of graphene oxide;

[0038] (3) Mix 50 mg of graphene oxide nanoribbons prepared in step (1) with 50 mg of graphene oxide prepared in step (2), add 50 mL of deionized water, and obtain a mixed solution with a concentration of 2 mg / mL after ultrasonication ;

[0039] (4) Add 0.5 mg of pyrrole and 0.5 mg of thiophene to the mixture obtained in step (3), and conduct a hydrothermal reaction at a reaction temperature of 180°C for 3 hours to obtain a hydrogel;

[0040] (5) Put the hydrogel obtained in step (4) into 2M KNO 3 In the solution, a second hydrothermal reaction is carried out, the reaction temperature is 130°C, and the reaction time is 2h. After cooling to room temperature, it is filtered, washed and freeze-dried;

[0041] (6) The product obtained after freeze...

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Abstract

The present invention relates to the technical field of electrode material preparation. Disclosed is a preparation method for an N / S-double doped graphene – graphene nanoribbon aerogel. The method comprises: first, mixing a graphene oxide nanoribbon with graphene oxide, adding deionized water, and performing uniform ultrasound to obtain the mixing solution; adding pyrrole and thiophene to the mixing solution, and performing one hydrothermal reaction to obtain a hydrogel; placing the obtained hydrogel into the KNO 3 solution, performing a second hydrothermal reaction, cooling to the room temperature, filtering, washing, and performing freeze drying; and performing thermal pyrolysis on the product obtained by freeze drying in an argon atmosphere to prepare the N / S-double doped graphene – graphene nanoribbon aerogel. According to the present invention, the graphene aerogel is doped with N / S. The N / S-double doping can further improve the reactivity and the conductivity of a carbon material. Compared with a single N- or S-doped material, more active sites are introduced to the N / S-double doped graphene aerogel to improve the electrochemical performance thereof, and the N / S-double doped graphene aerogel is expected to apply in the electrode material of a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation method of N and S double-doped graphene-graphene nanoribbon airgel. Background technique [0002] Among all carbon materials, such as carbon nanotubes, nanofibers, porous carbon, hollow nanospheres, carbon capsules, graphene nanosheets, graphene nanoribbons and their composites, graphene is superior due to its extraordinary electronic and mechanical properties. on other carbon materials. Although graphene has made considerable progress in supercapacitors, the performance is still not satisfactory. This is because the strong van der Waals force and π-π stacking interactions between graphene layers make them easy to aggregate to form a graphitic structure, which leads to the loss of effective specific surface area and lowers its specific capacitance. Therefore, in order to fully utilize the electrochemical properties of graphene, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86C01B32/184C01B32/194
CPCC01B32/184C01B32/194H01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 郑玉婴周珺
Owner 福建宸琦新材料科技有限公司
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