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Hetero atom-doped hollow spherical grapheme composite material, and preparation method and applications thereof

A composite material and graphene technology, applied in the field of graphene composite materials, heteroatom-doped hollow sphere graphene composite materials and their preparation, can solve the problems of difficult control, low actual utilization of specific surface, and influence of heteroatom-doped graphite To reduce the thickness and good solvent dispersion performance

Active Publication Date: 2015-10-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of using these two methods are: (1) the operating conditions are relatively harsh: the reaction temperature is high (usually >800 ° C), and the reaction time is long; (2) the degree of reduction is not high: the C / O atomic ratio is only 10, so It affects the conductivity of heteroatom-doped graphene; (3) the degree of doping is not high: the amount of heteroatom doping is less than 10%, and it is not easy to control; (4) the preparation cost is high; (5) the prepared graphene Sheets are easy to aggregate: Due to the high specific surface area, graphene is easy to aggregate due to the strong van der Waals force between planes
The transport of ions mainly occurs at the edge of the graphene sheet, which is less than the actual utilization of the surface
This greatly hinders its application in batteries

Method used

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  • Hetero atom-doped hollow spherical grapheme composite material, and preparation method and applications thereof
  • Hetero atom-doped hollow spherical grapheme composite material, and preparation method and applications thereof
  • Hetero atom-doped hollow spherical grapheme composite material, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A heteroatom-doped hollow sphere graphene composite material is prepared by the following method:

[0055] (1) Synthesis of graphene oxide

[0056] Adopt improved Hummers method to prepare graphene oxide, its technological process is as follows:

[0057] (1-1) Assemble the reaction flask in an ice-water bath, add a solid mixture of 1g of expanded graphite powder and 2.5g of sodium nitrate to the reaction flask under stirring (the stirring speed is 500r / min), and then add 150mL of mass percentage 95% concentrated sulfuric acid, reacted in an ice-water bath for 30 minutes; then, added 15 g of potassium permanganate 60 times (1 min each time), controlled the reaction temperature not to exceed 20 ° C, and continued to react for 12 h; then added 150 mL of deionized water After diluting, stirring and reacting for 30 minutes (stirring speed is 500r / min), the temperature was raised to 98° C. at a heating rate of 10° C. / min, and the temperature was kept for 48 hours. The color ...

Embodiment 2

[0078] A heteroatom-doped hollow sphere graphene composite material is prepared by the following method:

[0079] (1) synthesis of graphene oxide: same as embodiment 1 synthetic method;

[0080] (2) Preparation of positively charged polystyrene ball template: same as the preparation method of Example 1;

[0081] (3) Preparation of graphene oxide polystyrene spheres with core-shell structure and solid film of dibenzyl disulfide:

[0082] Disperse step (2) positively charged polystyrene balls in water and prepare the polystyrene ball dispersion of 25mg / mL; disperse graphene oxide in water and prepare the graphene oxide dispersion of 15mg / mL; Positively charged polystyrene sphere dispersion and 15 mL of graphene oxide dispersion were sequentially added to the reactor, magnetically stirred at room temperature for 24 h (stirring speed was 500 r / min), and filtered to obtain graphene oxide polymer with core-shell structure. Styrene sphere compound; Add 3g dibenzyl disulfide and sol...

Embodiment 3

[0087] A heteroatom-doped hollow sphere graphene composite material is prepared by the following method:

[0088] (1) synthesis of graphene oxide: same as embodiment 1 synthetic method;

[0089] (2) Preparation of positively charged polystyrene ball template: same as the preparation method of Example 1;

[0090] (3) Preparation of solid film of graphene oxide polystyrene spheres with core-shell structure and triphenylphosphine:

[0091] Disperse step (2) positively charged polystyrene balls in water and prepare the polystyrene ball dispersion of 25mg / mL; disperse graphene oxide in water and prepare the graphene oxide dispersion of 15mg / mL; Positively charged polystyrene sphere dispersion and 15 mL of graphene oxide dispersion were sequentially added to the reactor, magnetically stirred at room temperature for 24 h (stirring speed was 500 r / min), and filtered to obtain graphene oxide polymer with core-shell structure. Styrene sphere compound; Add 3g triphenylphosphine and sol...

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Abstract

The invention belongs to the technical field of carbon material and electrochemistry, and discloses a hetero atom-doped hollow spherical grapheme composite material, and a preparation method and applications thereof. The preparation method comprises following steps: styrene, polyvinyl pyrrolidone, and 2,2'-azobis(2-methylpropionamidine) dihydrochloride are mixed with water, and positively charged polystyrene spheres are prepared under certain conditions; a graphene oxide aqueous dispersion and a positively charged polystyrene sphere aqueous dispersion are stirred for reaction so as to prepare a graphene oxide@polystyrene sphere compound; a hetero atom-doped sourced compound and a solvent are added into the graphene oxide@polystyrene sphere compound, and an obtained mixture is subjected to mixing, coating, and freeze drying so as to obtain solid thin films; a substrate loaded with the solid thin films is delivered into a plasma high-temperature tubular reactor for reaction so as to obtain the hetero atom-doped hollow spherical grapheme composite material. The hetero atom-doped hollow spherical grapheme composite material possesses relatively high specific surface area and relatively excellent electrical properties, and can be applied to the field of supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of carbon materials and electrochemistry, and relates to a graphene composite material, in particular to a heteroatom-doped hollow sphere graphene composite material, a preparation method thereof, and an application in supercapacitors. Background technique [0002] Supercapacitors (Supercapacitors) have the advantages of fast charging and discharging speed, no pollution to the environment and long cycle life, and are expected to become a new type of green energy in this century. Electrode materials are an important part of supercapacitors and a key factor affecting the capacitance performance and production cost of supercapacitors. Therefore, research and development of high-performance, low-cost electrode materials is an important part of supercapacitor research. The electrode materials for supercapacitors currently studied mainly include carbon materials, metal oxides and their hydrate electrode materials,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 蒋仲杰
Owner SOUTH CHINA UNIV OF TECH
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