A preparation method of nitrogen-doped porous carbon/graphene two-dimensional composite electrode material

A composite material and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of large diffusion resistance and long diffusion path of electrolyte ions, and achieve improved conductivity, excellent power characteristics, The effect of increasing the specific capacitance

Inactive Publication Date: 2018-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of graphene increases the conductivity of the composite material to a certain extent, but the composite material is not a two-dimensional composite material. The path for the electrolyte ions to diffuse into the internal pores of the electrode material is very long, and the diffusion resistance is large. It is 50mA / g in the KOH system. When the specific capacitance value is only 278F / g

Method used

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  • A preparation method of nitrogen-doped porous carbon/graphene two-dimensional composite electrode material
  • A preparation method of nitrogen-doped porous carbon/graphene two-dimensional composite electrode material
  • A preparation method of nitrogen-doped porous carbon/graphene two-dimensional composite electrode material

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Embodiment 1

[0020] Weigh a certain amount of concentrated graphene oxide solution and ultrasonically disperse it in 100ml of deionized water to obtain a 0.33mg / ml graphene oxide suspension, then add 1g of pyrrole monomer, stir for 0.5h under ice bath conditions, and then add 50g of 10 % ferric chloride solution, continue to stir the reaction for 7h. After suction filtration, washing and drying, the polypyrrole / graphene oxide two-dimensional composite material is obtained. In this embodiment, the mass ratio of pyrrole / graphene oxide is 30:1, and its scanning electron microscope photo is shown in figure 1 , wherein, presents a two-dimensional structure, the thickness of the material is about 30nm.

Embodiment 2

[0022] Weigh a certain amount of concentrated graphene oxide solution and ultrasonically disperse it in 100ml of deionized water to obtain a 0.2mg / ml graphene oxide suspension, then add 1g of pyrrole monomer, stir for 0.5h under ice bath conditions, and then add 50g of 10 % ferric chloride solution, continue to stir the reaction for 7h. After suction filtration, washing and drying, the polypyrrole / graphene oxide two-dimensional composite material is obtained. In the embodiment of the present invention, the mass ratio of pyrrole / graphene oxide is 50:1, and its scanning electron microscope photo is shown in figure 2 , wherein, presents a two-dimensional structure, the thickness of the material is about 58nm.

Embodiment 3

[0024] Weigh a certain amount of graphene oxide concentrated solution and ultrasonically disperse it in 100ml of deionized water to obtain a 0.125mg / ml graphene oxide suspension, then add 1g of pyrrole monomer, stir for 0.5h under ice bath conditions, and then add 50g of 10 % ferric chloride solution, continue to stir the reaction for 7h. After suction filtration, washing and drying, the polypyrrole / graphene oxide two-dimensional composite material is obtained. In the embodiment of the present invention, the mass ratio of pyrrole / graphene oxide is 80:1, and its scanning electron microscope photo is shown in image 3 , wherein, presents a two-dimensional structure, the thickness of the material is about 78nm.

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Abstract

The invention relates to a preparation method for a nitrogen-doped porous carbon / graphene two-dimensional composite electrode material. The steps are as follows: (1) dispersing graphene oxide in a solvent in an ultrasonic manner to obtain a suspension, adding organic monomers, mechanically stirring and mixing the suspension, adding initiators to initiate the polymerization reaction, and obtaining a polymer / graphene oxide two-dimensional composite material via pumping filtration, washing, and drying after the completion of the reaction; and (2) mixing the product obtained by the step (1) with potassium hydroxide via a dry method according to a proportion and arranging the mixture into a tube furnace, performing high-temperature activation under the protection of nitrogen, and obtaining a target product via acid elution, deionized water washing, and drying of the activated product. The composite material prepared by the method is a two-dimensional structure, the pore channels of micropores are short, electrolyte ions can be rapidly diffused into the pore channels in the material from external electrolytic liquid phase, the conductivity of the composite material can be improved by graphene, and the thickness of a porous carbon layer in the composite material is adjustable.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor electrode material, in particular to a nitrogen-doped porous carbon / graphene two-dimensional composite electrode material and a preparation method thereof. Background technique [0002] With the rapid increase in the use of portable electronic devices, electric vehicles, and hybrid electric vehicles, the demand for energy storage devices with high power density and high energy density is also increasing. As a new type of energy storage device, supercapacitors have higher power density than secondary batteries and higher energy density than traditional capacitors, and have attracted widespread attention. The selection and design of electrode materials are critical to the performance of supercapacitors. A good electrode material should have a large effective specific surface area and fast ion transport channels. A large effective specific surface area can provide more adsorption interfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/36
CPCY02E60/13
Inventor 邢伟张誉李学进高秀丽薛庆忠阎子峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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