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Nitrogen-doped porous carbon material, preparation method thereof and application of nitrogen-doped porous carbon material in supercapacitor

A technology of nitrogen-doped porous carbon and melamine, which is applied in the preparation/purification of carbon, hybrid capacitor electrodes, etc., can solve the problems of uneconomical amount of activator, insufficient mixing, and dangerous activator, etc., and achieves easy large-scale production, Inexpensive and highly controllable effects

Inactive Publication Date: 2019-08-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

The method of activation with potassium hydroxide can effectively increase the pore volume and specific surface area of ​​carbon materials, but the traditional activation method uses physical grinding for mixing, and the mixing in this process is not sufficient, resulting in waste of activators
In order to achieve the activation effect, the mass ratio of activator to carbon precursor is generally 4. For large-scale mass production, such a high amount of activator is very uneconomical, and due to the strong alkalinity of the activator in the high-temperature activation process There is also a certain danger in

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  • Nitrogen-doped porous carbon material, preparation method thereof and application of nitrogen-doped porous carbon material in supercapacitor
  • Nitrogen-doped porous carbon material, preparation method thereof and application of nitrogen-doped porous carbon material in supercapacitor
  • Nitrogen-doped porous carbon material, preparation method thereof and application of nitrogen-doped porous carbon material in supercapacitor

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preparation example Construction

[0036] As a detailed example of the preparation of nitrogen-doped porous carbon materials, the preparation process is as follows: (1) Disperse melamine in water, then add formaldehyde solution, and continue to heat and stir until the melamine is completely dissolved, then add potassium nitrate and of polyethylene glycol, and continue stirring until dissolved. (2) Subsequently, the obtained clear solution is placed in an oven at a certain temperature and kept warm for a period of time to continuously evaporate moisture until a xerogel is formed. (3) Place the obtained xerogel in an inert gas, and activate it at a certain temperature for a period of time. (4) After the activated material is etched with hydrochloric acid, washed with water and dried, the prepared nitrogen-doped porous carbon material is obtained.

[0037] The present invention mixes the activator (potassium salt) and the carbon source by the sol-gel method, which is an original method. Since a uniform sol syste...

Embodiment 1

[0040] Get 1g of melamine and disperse it in 20ml of water, add 1.7g of formaldehyde solution (mass fraction is 37wt%), stir constantly at 70°C for 20 minutes, then add 3g of potassium nitrate and 6g of polyethylene glycol with a molecular weight of 10000, continue Stir until completely dissolved. The obtained solution was dried in an oven at 80° C. for 24 h to form a xerogel. Place the xerogel in the middle of the tube furnace, pass through 300sccm Ar, raise the temperature from room temperature to 800°C at a rate of 10°C / min, keep it at 800°C for 4 hours, and finally cool down with the furnace. The obtained sample was put into 3 mol / L hydrochloric acid aqueous solution, soaked for 24 hours, filtered, washed and dried to obtain a nitrogen-doped porous carbon material.

[0041] figure 1 It is the SEM and TEM photos of the three-dimensional hierarchical porous carbon material prepared in Example 1 at different magnifications. Such as figure 1 As shown in (a) and (b), abunda...

Embodiment 2

[0043] Get 1g of melamine and disperse it in 20ml of water, add 1.7g of formaldehyde solution (mass fraction is 37wt%), stir constantly at 70°C for 20 minutes, then add 2g of potassium nitrate and 6g of polyethylene glycol with a molecular weight of 10000, continue Stir until completely dissolved. The obtained solution was dried in an oven at 80° C. for 24 h to form a xerogel. Place the xerogel in the middle of the tube furnace, pass through 300sccm Ar, raise the temperature from room temperature to 800°C at a rate of 10°C / min, keep it at 800°C for 4 hours, and finally cool down with the furnace. The obtained sample was put into 3mol / L hydrochloric acid aqueous solution, soaked for 24h, filtered, washed and dried to obtain a nitrogen-doped porous carbon material. For its microscopic appearance, see Figure 5 , the rich pore structure can be clearly seen in the figure. Image 6 (a) is the nitrogen adsorption-desorption curve of the obtained nitrogen-doped porous carbon materi...

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Abstract

The invention relates to a nitrogen-doped porous carbon material, a preparation method thereof and application of the nitrogen-doped porous carbon material in a supercapacitor. The preparation methodcomprises the following steps: (1) heating and polymerizing a formaldehyde solution and melamine in water, and then adding potassium salt and polyethylene glycol to obtain a clear solution, wherein the potassium salt is at least one of potassium nitrate, potassium acetate, potassium nitrite, potassium sulfate, potassium sulfite, potassium chloride, potassium hypochlorite and potassium perchlorate;(2) drying the obtained clear solution at the temperature of 60-80 DEG C until a xerogel is formed; and (3) placing the obtained xerogel in a protective atmosphere, activating at the temperature of 700-1000 DEG C, and washing and drying to obtain the nitrogen-doped porous carbon material.

Description

technical field [0001] The invention relates to a nitrogen-doped porous carbon material powder and its preparation method and application, in particular to a method for preparing a nitrogen-doped porous carbon material powder mainly composed of micropores by a sol-gel method, which belongs to nitrogen-doped The field of porous carbon materials. Background technique [0002] In order to meet the energy demand brought about by the rapid economic development, various energy storage devices such as supercapacitors, lithium-ion batteries, and lithium-sulfur batteries have received extensive attention. Among them, supercapacitor has the characteristics of high power density, long cycle life, safety and cheapness, etc. It is an excellent energy storage system, and it is also a hot field of recent research, with a very wide application prospect. Carbon materials are very suitable as electrode materials for supercapacitors due to their good electrical conductivity and excellent spec...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01G11/24H01G11/30H01G11/32H01G11/34H01G11/44
CPCC01B32/05H01G11/24H01G11/30H01G11/32H01G11/34H01G11/44Y02E60/13
Inventor 黄富强金艳钱猛
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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