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A preparation method of two-dimensional nitrogen-doped porous carbon material for supercapacitor

A supercapacitor, nitrogen-doped technology, applied in hybrid/electric double-layer capacitor manufacturing, carbon preparation/purification, hybrid capacitor electrodes, etc., can solve problems such as pollution, avoid pollution, improve electrochemical performance, and prepare methods simple effect

Active Publication Date: 2022-05-10
DALIAN UNIV OF TECH PANJIN INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current template-free methods are to obtain two-dimensional carbon materials by carbonizing the precursor of the two-dimensional structure, and there are few methods available.
[0003] In addition, in order to create pores for carbon materials and improve their electrochemical performance, the current common activation method is to use potassium hydroxide as an activator for high-temperature treatment, which will generate a lot of pollution and bring serious environmental problems.

Method used

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  • A preparation method of two-dimensional nitrogen-doped porous carbon material for supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0022] Dissolve 0.3mol of zinc nitrate in 30ml of isopropanol, add 6ml of glycerol, stir evenly, put it in a polytetrafluoroethylene kettle, react at 200°C for 4h, wash with ethanol, and dry at 60°C 12h, the zinc-glycerol compound (Zn-GL) was obtained.

[0023] Take 40 mg of the dry product obtained above and disperse it in a mixed solution of 20 ml of ethanol and 20 ml of water, then add 10 mg of tris(hydroxymethyl)aminomethane and 10 mg of dopamine hydrochloride, and react at room temperature for 12 hours. The reacted product was centrifuged and dried to obtain Zn-GL@PDA

[0024] The dried product Zn-GL@PDA obtained in the previous step was carbonized at 910 °C for 2 h at 2 °C / min, and the product was taken out to obtain a two-dimensional nitrogen-doped porous carbon. In the three-electrode test system of 6M KOH solution, 0.5Ag -1 Under constant current conditions, the specific capacitance is 186Fg -1 , 10Ag -1 Under constant current conditions, the specific capacitance ...

Embodiment 2

[0026] Dissolve 0.6mol of zinc nitrate in 30ml of isopropanol, add 6ml of glycerol, stir evenly, put it in a polytetrafluoroethylene kettle, react at 180°C for 12h, wash with ethanol, and dry at 60°C 12h, the zinc-glycerol compound (Zn-GL) was obtained.

[0027] Take 60 mg of the dry product obtained above and disperse it in a mixed solution of 20 ml of ethanol and 20 ml of water, then add 120 mg of tris(hydroxymethyl)aminomethane and 120 mg of dopamine hydrochloride, and react at room temperature for 24 hours. The reacted product was centrifuged and dried to obtain Zn-GL@PDA

[0028] The dried product Zn-GL@PDA obtained in the previous step was carbonized at 1000 °C for 2 h at 5 °C / min, and the product was taken out to obtain a two-dimensional nitrogen-doped porous carbon. In the three-electrode test system of 6M KOH solution, 0.5Ag -1 Under constant current conditions, the specific capacitance is 278Fg -1 , 10Ag -1 Under constant current conditions, the specific capacita...

Embodiment 3

[0030] Dissolve 0.3mol of zinc sulfate in 20ml of isopropanol, add 10ml of glycerol, stir evenly, put it into a polytetrafluoroethylene kettle, react at 220°C for 18h, wash with ethanol, and dry at 60°C 12h, obtain zinc-glycerol compound (Zn-GL)

[0031] Take 100mg of the dry product obtained above and disperse in a mixed solution of 20ml of ethanol and 20ml of water, then add 200mg of tris(hydroxymethyl)aminomethane and 400mg of dopamine hydrochloride, and react at room temperature for 24h. The reacted product was centrifuged and dried to obtain Zn-GL@PDA

[0032] The dried product Zn-GL@PDA obtained in the previous step was carbonized at 1100 °C for 4 h at 10 °C / min, and the product was taken out to obtain a two-dimensional nitrogen-doped porous carbon. In the three-electrode test system of 6M KOH solution, 0.5Ag -1 Under constant current conditions, the specific capacitance is 212Fg -1 , 10Ag -1 Under constant current conditions, the specific capacitance is 183Fg -1 . ...

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Abstract

The invention belongs to the technical field of material preparation, and relates to a method for preparing a two-dimensional nitrogen-doped porous carbon material for supercapacitors. Mix zinc salt, glycerol and isopropanol to prepare a solution, and carry out solvothermal reaction in a polytetrafluoro still. The resulting precipitate was washed and dried to obtain the zinc-glycerol compound Zn-GL. The prepared product was dispersed in an aqueous ethanol solution, and tris(hydroxymethyl)aminomethane and dopamine hydrochloride were added for reaction to obtain PDA-coated Zn-GL. After the obtained product is centrifugally dried and carbonized, a two-dimensional nitrogen-doped porous carbon is obtained. The effects and benefits of the present invention are: the preparation method is simple and no template is required; the sublimation of Zn in the high-temperature carbonization process can play a role in creating pores, avoiding the pollution caused by the subsequent activation process, and being environmentally friendly; The construction of the structure and the introduction of nitrogen improved the electrochemical performance of the prepared two-dimensional nitrogen-doped porous carbon materials as capacitor electrodes.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a two-dimensional nitrogen-doped porous carbon material for a supercapacitor. Background technique [0002] With the depletion of traditional fossil fuels, the development and application of sustainable energy has gradually become the core issue of common concern and urgent solution in the world. As an electrochemical energy storage device with excellent electrochemical properties and environmental friendliness, supercapacitors have attracted more and more attention from scientists and industrial researchers. Porous carbon material is a new type of carbon material widely used. Its raw materials are simple and easy to obtain, it has good chemical stability, and has a large specific surface area. It can be used as a capacitor electrode material. However, due to its pore structure and microscopic morphology Affected, its rate performance is poor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/30H01G11/34H01G11/86
CPCC01B32/05H01G11/30H01G11/24H01G11/34H01G11/86Y02E60/13
Inventor 米盼盼贺高红张旭郭明钢代岩
Owner DALIAN UNIV OF TECH PANJIN INST OF IND TECH