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Environment-friendly preparation method for rice-hull-based capacitor carbon material with hierarchical porous structure

A technology of pore structure and capacitive carbon, which is applied in the field of comprehensive utilization of resources and electrochemical supercapacitors, can solve the problems of general capacitive performance, high preparation cost, and large consumption of activated materials, and achieve excellent specific capacitance and power characteristics, which is beneficial to industry The effect of promoting application and reducing production cost

Active Publication Date: 2014-11-19
旗禾科技(吉林)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN103539118A discloses a method for preparing activated carbon for supercapacitors, but the prepared carbon material has a relatively single pore structure and general capacitance performance
In addition, the above-mentioned patent consumes a large amount of activated materials and water during the preparation process, which not only produces a large amount of waste liquid, pollutes the environment, but also leads to an increase in the preparation cost

Method used

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  • Environment-friendly preparation method for rice-hull-based capacitor carbon material with hierarchical porous structure
  • Environment-friendly preparation method for rice-hull-based capacitor carbon material with hierarchical porous structure
  • Environment-friendly preparation method for rice-hull-based capacitor carbon material with hierarchical porous structure

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Rice husk is cleaned, dried and ground;

[0031] (2) Carbonizing the rice husks in the above step (1) under nitrogen conditions at a carbonization temperature of 500° C. for 1 hour to obtain a carbonized product;

[0032] (3) Mix the carbonized product obtained in the above step (2) with 2% sodium hydroxide solution at a mass volume ratio of 1:6, control the reaction temperature at 140°C, heat for 2h, filter, wash, and dry to obtain template carbon , the filtrate is water glass with a modulus of 3.7;

[0033](4) Mix the template carbon and potassium hydroxide obtained in the above step (3) uniformly 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, to activate;

[0034] (5) Soak the activated product obtained in the above step (4) with hot water at 90°C for 0.5h, filter, wash until neutral, and dry to obtain a rice husk-based capacitor carbon with a multi-level pore structure, with a specif...

Embodiment 2

[0037] (1) Rice husk is cleaned, dried and ground;

[0038] (2) Carbonizing the rice husks in the above step (1) under nitrogen conditions at a carbonization temperature of 500° C. for 1 hour to obtain a carbonized product;

[0039] (3) Mix the carbonized product obtained in the above step (2) with 4% sodium hydroxide solution at a mass volume ratio of 1:5, control the reaction temperature at 130°C, heat for 1.5h, filter, wash, and dry to obtain the template Carbon, the filtrate is water glass with a modulus of 3.1;

[0040] (4) Mix the template carbon and potassium hydroxide obtained in the above step (3) uniformly in a mass ratio of 1:4, control the reaction temperature to 700°C, the heating rate to 12°C / min, the reaction time to 2h, and activate to obtain an activated product;

[0041] (5) Soak the activated product obtained in the above step (4) in hot water at 90°C for 1 hour, filter, wash until neutral, and dry to obtain a rice husk-based capacitor carbon with a multi-l...

Embodiment 3

[0044] (1) Rice husk is cleaned, dried and ground;

[0045] (2) Carbonizing the rice husk in the above step (1) under argon gas at a carbonization temperature of 550° C. for 1 hour to obtain a carbonized product;

[0046] (3) Mix the carbonized product obtained in the above step (2) with 3% sodium hydroxide solution at a mass volume ratio of 1:8, control the reaction temperature at 130°C, heat for 1.5h, filter, wash, and dry to obtain the template Carbon, the filtrate is water glass with a modulus of 2.8;

[0047] (4) Mix the template carbon and sodium hydroxide obtained in the above step (3) uniformly in a mass ratio of 1:3, control the reaction temperature to 800°C, the heating rate to 15°C / min, and the reaction time to 2h to obtain an activated product;

[0048] (5) Soak the activated product obtained in the above step (4) in hot water at 90°C for 2 hours, filter, wash until neutral, and dry to obtain a rice husk-based capacitor carbon with a multi-level pore structure, wi...

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Abstract

The invention aims to provide an environment-friendly preparation method for a rice-hull-based capacitor carbon material with a hierarchical porous structure. The traditional carbonization and activation processes are combined with a template method according to the unique structure of cheap rice hull, the carbon material with the hierarchical porous structure is prepared by taking silica in the rice hull as a template through carbonizing, soda boiling and activating, waste liquid generated in the preparation process is converted into high-modulus water glass and an alkali activating agent, and meanwhile water is recycled. The method has the characteristics of simplicity in operation, low cost, environmental friendliness and the like. By using the method, the problem of environmental pollution caused in the rice hull utilization process is solved, and the production cost is greatly reduced; and the method is beneficial to industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources and electrochemical supercapacitors, and relates to a green preparation method of a rice husk-based capacitive carbon material with a multi-level pore structure. Background technique [0002] Electrochemical supercapacitor is a new type of high-efficiency energy storage device between rechargeable batteries and traditional capacitors. It has the characteristics of high power density, high charge and discharge efficiency, and long cycle life. develop. Electrode material is an important factor in determining the performance of supercapacitors. Among the many electrode materials for electrochemical supercapacitors, activated carbon materials have been commercially applied due to their advantages such as large specific surface area, wide range of raw material sources, low price, mature process, and stable performance. However, there are still problems in the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 林海波刘德臣李阳陆海彦张文礼
Owner 旗禾科技(吉林)有限责任公司
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