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Modification method for rice husk based capacitance carbon material

A technology of capacitive carbon and rice husk, which is applied in chemical instruments and methods, hybrid capacitor electrodes, carbon compounds, etc., can solve the problems of limiting the application of rice husk-based capacitive carbon materials, and achieves the advantages of being conducive to industrialization, popularization and application, simple preparation process, The effect of good specific capacitance and power characteristics

Inactive Publication Date: 2019-05-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this self-discharge problem greatly limits the application of rice husk-based capacitive carbon materials.

Method used

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  • Modification method for rice husk based capacitance carbon material
  • Modification method for rice husk based capacitance carbon material
  • Modification method for rice husk based capacitance carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Rice husk is cleaned, dried and ground;

[0027] (2) carbonizing the rice husk in the above step (1) at 500° C. for 1 h under the protection of nitrogen to obtain a carbonized product;

[0028] (3) Mix the carbonized product obtained in the above step (2) with 2% sodium hydroxide solution at a mass volume ratio of 1:3, control the temperature at 100°C, heat for 2h, filter, wash to pH 7, and dry to obtain template carbon,

[0029] (4) Mix the template carbon obtained in the above step (3) with 1mol L-1 strong alkali sodium hydroxide in a mass ratio of 1:3, control the reaction temperature to 750°C, the heating rate to 10°C / min, and the reaction time to 1h. get activated product;

[0030] (5) Soak the activated product obtained in the above step (4) with hot water at 90° C. for 2 hours, filter, wash until neutral, and dry to obtain rice husk-based capacitor carbon;

[0031] (6) the rice husk-based capacitor carbon obtained in the above step (5) is pulverized to 8-1...

Embodiment 2

[0034] (1) Rice husk is cleaned, dried and ground;

[0035] (2) carbonizing the rice husk in the above step (1) at 500° C. for 1 h under the protection of nitrogen to obtain a carbonized product;

[0036] (3) Mix the carbonized product obtained in the above step (2) with 2% sodium hydroxide solution at a mass volume ratio of 1:3, control the temperature at 100°C, heat for 2h, filter, wash to pH 7, and dry to obtain template carbon,

[0037] (4) Mix the template carbon obtained in the above step (3) with 1mol L-1 strong alkali sodium hydroxide in a mass ratio of 1:3, control the reaction temperature to 750°C, the heating rate to 10°C / min, and the reaction time to 1h. get activated product;

[0038] (5) Soak the activated product obtained in the above step (4) with hot water at 90° C. for 2 hours, filter, wash until neutral, and dry to obtain rice husk-based capacitor carbon;

[0039] (6) the rice husk-based capacitor carbon obtained in the above step (5) is pulverized to 8-1...

Embodiment 3

[0042] (1) Rice husk is cleaned, dried and ground;

[0043] (2) carbonizing the rice husk in the above step (1) at 500° C. for 1 h under the protection of nitrogen to obtain a carbonized product;

[0044] (3) Mix the carbonized product obtained in the above step (2) with 2% sodium hydroxide solution at a mass volume ratio of 1:3, control the temperature at 100°C, heat for 2h, filter, wash to pH 7, and dry to obtain template carbon,

[0045](4) Mix the template carbon obtained in the above step (3) with 1mol L-1 strong alkali sodium hydroxide in a mass ratio of 1:3, control the reaction temperature to 750°C, the heating rate to 10°C / min, and the reaction time to 1h. get the activated product;

[0046] (5) Soak the activated product obtained in the above step (4) with hot water at 90° C. for 2 hours, filter, wash until neutral, and dry to obtain rice husk-based capacitor carbon;

[0047] (6) the rice husk-based capacitor carbon obtained in the above step (5) is pulverized to ...

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Abstract

The invention aims at providing a modification method for a rice husk based capacitance carbon material. Aiming at the problem that the self-discharging rate of super-capacitors utilizing rice husk based capacitance carbon is great, a preparation method of rice husk based capacitance-carbon is improved and the self-discharging rate of rice husk based capacitance carbon super-capacitors is reduced.The modification method adopts a simple heat treatment modification method, has the characteristics of convenience for operation, greenness and environment protection and is easy to popularize in theaspect of industry.

Description

technical field [0001] The invention belongs to the field of supercapacitors and relates to a method for modifying rice husk-based capacitor carbon materials. Background technique [0002] Supercapacitor is a new type of high-efficiency energy storage device between secondary batteries and traditional capacitors. It has the characteristics of high power density, high charge and discharge efficiency, and long cycle life. It has been widely valued and developed rapidly in recent years. . Activated carbon is an important material for supercapacitors. It has the advantages of large specific surface area, wide source of raw materials, low price, mature process, and stable performance. However, the performance of activated carbon with different pore structure characteristics is different. For example, activated carbon materials mainly composed of micropores have a high specific surface area, but their rich microporous surfaces are difficult to be fully utilized during high-curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/354H01G11/42
CPCY02E60/13
Inventor 林海波肖程元陆海彦
Owner JILIN UNIV
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