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Corncob-based porous carbon material, and preparation method and application thereof

A technology of porous carbon materials and corn cobs, applied in the field of material science, can solve problems such as complex preparation processes, and achieve the effects of simple processing, wide application, and large capacity

Inactive Publication Date: 2016-03-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current research, most of the research needs to prepare bio-based porous carbon materials by low-temperature pre-carbonization and then high-temperature carbonization, and the preparation process is relatively complicated.

Method used

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  • Corncob-based porous carbon material, and preparation method and application thereof
  • Corncob-based porous carbon material, and preparation method and application thereof
  • Corncob-based porous carbon material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 3g of corncobs cut into short sections into a beaker, add 3g of KOH, then add a small amount of water to cover the corncobs, and soak for 8h. It was dried in an oven at 80°C for 6h, and the dried residue was carbonized at 750°C for 1.5h in an argon atmosphere, the gas flow rate was 0.5L / min, and the heating rate was 5°C / min. The obtained product was washed 5 times with 2M hydrochloric acid, then washed with water until neutral, and dried at 80° C. for 12 hours to obtain a corncob-based porous carbon material.

[0037] from figure 1 It can be seen that the prepared corncob-based porous carbon material has abundant pores, and the specific surface area of ​​the porous carbon material is: 1151.2m 2 / g.

Embodiment 2

[0039] Put 3 g of short-cut corn cobs into a beaker, mix with KOH solid at a mass ratio of 0.5:1, soak in water for 10 h, and then dry at 100 °C for 10 h. Put the dried sample into a boat-shaped sample tank, and carbonize at 750 °C for 1.5 h in a nitrogen atmosphere, with a gas flow rate of 0.5 L / min and a heating rate of 5 °C / min. The obtained product was washed 5 times with 2M hydrochloric acid, then washed with water until neutral, and dried at 80° C. for 12 hours to obtain a corncob-based porous carbon material.

[0040] from image 3 It can be seen that the prepared corncob-based porous carbon material has abundant pores, and the specific surface area of ​​the porous carbon material is: 1182.7m 2 / g. Corncob porous carbon materials were successfully prepared by this method.

[0041] The obtained corncob-based porous carbon material was used as raw material (80wt%), mixed with acetylene black (10wt%) and PTFE (10wt%) to make a semi-dry slurry, pressed on foamed nickel (...

Embodiment 3

[0043] Put 3 g of short-cut corn cobs into a beaker, mix with KOH solid at a mass ratio of 0.5:1, soak in water for 10 h, and then dry at 100 °C for 8 h. Put the dried sample into the boat-shaped sample tank, and in the atmosphere of argon, first carbonize at 300°C for 1h, the heating rate is 5°C / min, then carbonize at 750°C for 1.5h, the gas flow rate is 0.5L / min, and heat up The rate was 3°C / min. The obtained product was washed 5 times with 2M hydrochloric acid, then washed with water until neutral, and dried at 80°C for 12 hours to obtain a corncob-based porous carbon material with a specific surface area of ​​1577.7m 2 / g.

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Abstract

The invention discloses a corncob-based porous carbon material, and a preparation method and application thereof, belonging to the field of material science. The preparation method comprises the following steps: (1) washing, drying and crushing corncobs; (2) activating the crushed corncobs in an aqueous solution of an activator and then taking out the corncobs for drying; and (3) subjecting the dried corncobs to high-temperature carbonization in an inert gas atmosphere, washing a carbonization product with acid at first and then with water until the carbonization product is neutral and drying the washed product so as to obtain the corncob-based porous carbon material. According to the invention, the corncob-based porous carbon material is directly prepared through one-step carborization; the preparation method is simple and cheap and provides reference to mass preparation of biomass and porous carbon materials; and the prepared corncob-based porous carbon material has excellent performance and a wide application scope, can be used as an electrode of a supercapacitor, has great capacity and good stability and realizes high-efficiency utilization of biomass resources.

Description

technical field [0001] The invention relates to a corn cob porous carbon material and a preparation method thereof, and applies the prepared porous carbon material to a supercapacitor, belonging to the field of material science. Background technique [0002] Carbon materials are a research hotspot worldwide and come in many forms, including graphene, carbon nanotubes, carbon fibers, carbon quantum dots, porous carbon, etc. As a special carbonaceous material, porous carbon has the advantages of developed pores, high specific surface area, low density, high thermal conductivity, stable chemical properties, stable mechanical properties, and good electrical conductivity. It can be used in many industries, such as food Processing, medicine, chemical industry, petroleum, mining, nuclear power, automobile, vacuum manufacturing industry, adsorption of organic matter and inorganic metal ions in solution, adsorption of toxic gases, catalyst carrier and electrode material of supercapac...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y40/00
Inventor 王小慧徐曼曼孙润仓黄权波
Owner SOUTH CHINA UNIV OF TECH
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