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Graphene with composite pore structure, preparation method thereof and application in super capacitor

A composite hole and graphene technology, applied to graphene with a composite pore structure, in the field of its preparation, can solve the problems of low specific capacitance and low effective specific surface area, achieve high specific capacitance, improve effective specific surface area, The effect of high specific surface area

Active Publication Date: 2013-04-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific capacitance value of graphene assembled into a supercapacitor as an electrode material is not high, only 166F / g, which is far lower than the theoretical specific capacitance value of graphene 550F / g. The reason is mainly in the electrode preparation process. , due to the strong van der Waals force between the graphene sheets, the graphene aggregates with each other, making it difficult for the electrolyte to enter the narrow space between the graphene sheets during the charging process to form an effective electric double layer capacitance. Therefore, the microporous graphene Although the specific surface area is high, its effective specific surface area is very low.

Method used

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  • Graphene with composite pore structure, preparation method thereof and application in super capacitor
  • Graphene with composite pore structure, preparation method thereof and application in super capacitor
  • Graphene with composite pore structure, preparation method thereof and application in super capacitor

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Embodiment 1

[0037] In this embodiment, the graphene sheet structure having a compound pore structure includes both micropores and macropores, the diameter of the micropores is 0.1 nm˜10 nm, and the diameter of the macropores is 50 nm˜100 nm.

[0038] The above-mentioned preparation method of graphene with composite pore structure is as follows:

[0039] (1) After ultrasonically mixing 40ml of the aqueous dispersion containing 100mg of graphene oxide and 160ml of the aqueous dispersion containing 6mg of zinc oxide nanoparticles (average particle size 4nm), they were heated at 90°C for 5 hours under electromagnetic stirring to make Zinc oxide nanoparticles are uniformly dispersed on the surface of graphene oxide to obtain a dispersion liquid of zinc oxide nanoparticles composite graphene oxide;

[0040] (2) Place the dispersion of zinc oxide nanoparticles and graphene oxide under a 24W ultraviolet lamp, and light it for 12 hours under electromagnetic stirring;

[0041] (3) Add 2.1ml of hyd...

Embodiment 2

[0048] In this embodiment, the graphene sheet structure having a compound pore structure is the same as that of the graphene sheet structure having a compound pore structure in Example 1.

[0049] The above-mentioned preparation method of graphene with composite pore structure is as follows:

[0050] (1) Ultrasonically mix 40ml of N-methylpyrrolidone phase dispersion containing 100mg graphene oxide with 200ml of N-methylpyrrolidone phase dispersion containing 25mg of zinc oxide nanoparticles (average particle size 4nm) Heating at 90°C for 5 hours, so that the zinc oxide nanoparticles are evenly dispersed on the surface of graphene oxide, and a dispersion liquid of zinc oxide nanoparticles composite graphene oxide is obtained;

[0051] (2) Place the dispersion of zinc oxide nanoparticles and graphene oxide under a 24W ultraviolet lamp, and light it for 35 hours under electromagnetic stirring;

[0052] (3) Add 10ml of hydrochloric acid with a mass fraction of 0.37% to the dispe...

Embodiment 3

[0059] In this embodiment, the graphene sheet structure having a compound pore structure is the same as that of the graphene sheet structure having a compound pore structure in Example 1.

[0060] The above-mentioned preparation method of graphene with composite pore structure is as follows:

[0061] (1) After ultrasonically mixing 40ml of N-methylpyrrolidone phase dispersion containing 100mg graphene oxide and 160ml of N-methylpyrrolidone phase dispersion containing 12.5mg of zinc oxide nanoparticles (average particle size 4nm), the Stirring and heating at 90° C. for 5 hours, so that the zinc oxide nanoparticles are uniformly dispersed on the surface of graphene oxide, and a dispersion liquid of zinc oxide nanoparticles composite graphene oxide is obtained;

[0062] (2) Place the dispersion of zinc oxide nanoparticles and graphene oxide under a 24W ultraviolet lamp, and light it for 35 hours under electromagnetic stirring;

[0063] (3) Add 10ml of hydrochloric acid with a ma...

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Abstract

The invention provides graphene with a composite pore structure and a preparation method thereof. The lamellar structure of the graphene comprises micropores with pore diameters of 0.1-10nm and macropores with pore diameters of greater than 50nm. Semiconductor oxide nano particles are combined with graphene oxide; in the mixed dispersion liquid thereof, the conjugate microcells of the graphene oxide absorb photons to generate electrons and holes through an ultraviolet irradiation method, and the electrons and holes react with oxygen-containing groups of a non-conjugate area to generate macropores; and the semiconductor oxide nano particles absorb photons to generate electrons and holes, and the graphene oxide of the microcells in direct contact with the semiconductor oxide nano particles is oxidized to generate micropores. When serving as an electrode material, the graphene has a high specific surface area and also can enable electrolyte to enter a narrow space between the lamellas of the graphene to form an effective double layer so as to increase the effective specific surface area of the grapheme, thereby obtaining a device with a high specific capacitance value.

Description

technical field [0001] The invention relates to the fields of graphene materials and supercapacitors, in particular to graphene with a composite pore structure, its preparation method and its application in supercapacitors. Background technique [0002] Graphene is a new type of carbon nanomaterial with a two-dimensional single atomic layer thickness. Due to its ultra-high electrical conductivity and large specific surface area, it has received great attention in the field of energy storage materials in recent years. [0003] A supercapacitor is a new type of energy storage device, and its structure can be regarded as two parallel porous electrode plates suspended in the electrolyte. When an electric field is applied, the ions in the electrolyte migrate to the surface of the porous electrode plate, the positive charge accumulates on the negative plate, and the negative charge accumulates on the positive plate, thus forming two parallel electric double layer capacitors. Comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01G11/24C01B32/184C01B32/19
CPCY02E60/13
Inventor 周明陈友虎田天秦禄昌崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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