Activated carbon preparation method and activated carbon

Abstract

The invention relates to an activated carbon preparation method and activated carbon. The activated carbon preparation method comprises the following steps: activating straws at the temperature of 300-400 DEG C in a protective gas atmosphere to obtain an activated product; uniformly mixing the activated product with strong base based on the mass ratio of 1: 3-1: 4 to obtain a mixture; activating the mixture for 1-2 hours at the temperature of 500-800 DEG C in the protective gas atmosphere to obtain a primary product; dipping the primary product in inorganic strong acid; and maintaining the temperature of 80-90 DEG C for 1 to 2 hours to obtain the activated carbon. The activated carbon prepared by the above mentioned activated carbon preparation method is capable of increasing the specific capacity of a supercapacitor.

Description

technical field

[0001] The invention relates to a preparation method of activated carbon and the activated carbon. Background technique

[0002] With the development of economy and the improvement of living standards, energy problems and environmental pollution problems are becoming more and more serious. The development and application of new pollution-free energy sources are hot issues being studied by researchers from all over the world. Supercapacitors have quickly attracted people's attention for their excellent characteristics of short charge and discharge time, long cycle life, wide temperature range, high specific power of physical capacitors and high specific energy of batteries. Supercapacitors, also known as electrochemical capacitors or electric double layer capacitors, have played an important role in electric vehicles, mobile communications, solar and wind power generation, aerospace and defense technology, etc.

[0003] The electrode material is an important ...

Examples

preparation example Construction

[0029] The preparation method of activated carbon and the activated carbon will be further described in detail in combination with specific embodiments below.

[0030] The preparation method of the gac of an embodiment, comprises the following steps:

[0031] Step S110 , carbonizing the straw at 300° C. to 400° C. under a protective gas atmosphere to obtain carbides.

[0032] In one embodiment, the stalks are corn stalks. Of course, in other embodiments, the straw can also be the remaining part of wheat, rice, potatoes, rapeseed, cotton, sugar cane or other coarse grain crops after the seeds are harvested.

[0033] In one embodiment, the straw is crushed, and the crushed straw is carbonized at 300° C. to 400° C. to obtain carbides. Preferably, the straw is pulverized to a particle size of 10 microns to 30 microns.

[0034] In one embodiment, the protective gas is selected from at least one of nitrogen, argon and helium.

[0035] In one embodiment, the straw is placed in a ...

Embodiment 1

[0065] The preparation of activated carbon comprises the following steps:

[0066] (1) Put 2 grams of crushed corn stalk cores in a tube furnace, and carry out carbonization at 350° C. under the protection of nitrogen to obtain 0.4 g of carbides, and the carbonization time is 3 hours;

[0067] (2) the carbide obtained in step (1) is placed in an agate mortar and ground for 0.5 hour to grind evenly, and the carbide by mass ratio: KOH=1:3 takes by weighing potassium hydroxide 1.2g and mixes with the carbide to obtain a mixture;

[0068] (3) Move the mixture in step (2) to a tube furnace, heat the mixture to 700° C. at a heating rate of 5° C. / min under nitrogen protection, and hold the temperature for 1 hour to obtain a pre-product;

[0069] (4) After the pre-product prepared by step (3) is placed in an agate mortar and ground for 0.5 hours, it is mixed with 40 mL of 2mol / L hydrochloric acid, bathed in water for 1 hour at 90° C., and the filter residue obtained after filtration i...

Embodiment 2

[0075] (1) Put 1 gram of crushed corn stalks in a tube furnace, and carbonize at 300° C. to obtain 0.2 g of carbides, and the carbonization time is 2 hours;

[0076] (2) Place the carbide obtained in step (1) in an agate mortar and grind for 1 hour to grind evenly, get 0.6g of potassium hydroxide by mass ratio carbide: KOH=1:3 and mix with carbide to obtain a mixture;

[0077] (3) Move the mixture in step (2) to a tube furnace, heat the mixture to 500° C. at a heating rate of 5° C. / min under nitrogen protection, and hold the temperature for 1 hour to obtain a pre-product;

[0078] (4) After the pre-product prepared in step (3) is placed in an agate mortar and ground for 1 hour, it is mixed with 40 mL of 1mol / L hydrochloric acid, and water bathed for 1 hour at 80° C., and the filter residue obtained after filtration is washed with deionized water until Neutral, and dry at 60 ° C for 12 hours, you can get the amorphous activated carbon material.

[0079] The specific surface ar...

technical field

[0001] The invention relates to a preparation method of activated carbon and the activated carbon. Background technique

[0002] With the development of economy and the improvement of living standards, energy problems and environmental pollution problems are becoming more and more serious. The development and application of new pollution-free energy sources are hot issues being studied by researchers from all over the world. Supercapacitors have quickly attracted people's attention for their excellent characteristics of short charge and discharge time, long cycle life, wide temperature range, high specific power of physical capacitors and high specific energy of batteries. Supercapacitors, also known as electrochemical capacitors or electric double layer capacitors, have played an important role in electric vehicles, mobile communications, solar and wind power generation, aerospace and defense technology, etc.

[0003] The electrode material is an important ...

Examples

preparation example Construction

[0029] The preparation method of activated carbon and the activated carbon will be further described in detail in combination with specific embodiments below.

[0030] The preparation method of the gac of an embodiment, comprises the following steps:

[0031] Step S110 , carbonizing the straw at 300° C. to 400° C. under a protective gas atmosphere to obtain carbides.

[0032] In one embodiment, the stalks are corn stalks. Of course, in other embodiments, the straw can also be the remaining part of wheat, rice, potatoes, rapeseed, cotton, sugar cane or other coarse grain crops after the seeds are harvested.

[0033] In one embodiment, the straw is crushed, and the crushed straw is carbonized at 300° C. to 400° C. to obtain carbides. Preferably, the straw is pulverized to a particle size of 10 microns to 30 microns.

[0034] In one embodiment, the protective gas is selected from at least one of nitrogen, argon and helium.

[0035] In one embodiment, the straw is placed in a ...

Embodiment 1

[0065] The preparation of activated carbon comprises the following steps:

[0066] (1) Put 2 grams of crushed corn stalk cores in a tube furnace, and carry out carbonization at 350° C. under the protection of nitrogen to obtain 0.4 g of carbides, and the carbonization time is 3 hours;

[0067] (2) the carbide obtained in step (1) is placed in an agate mortar and ground for 0.5 hour to grind evenly, and the carbide by mass ratio: KOH=1:3 takes by weighing potassium hydroxide 1.2g and mixes with the carbide to obtain a mixture;

[0068] (3) Move the mixture in step (2) to a tube furnace, heat the mixture to 700° C. at a heating rate of 5° C. / min under nitrogen protection, and hold the temperature for 1 hour to obtain a pre-product;

[0069] (4) After the pre-product prepared by step (3) is placed in an agate mortar and ground for 0.5 hours, it is mixed with 40 mL of 2mol / L hydrochloric acid, bathed in water for 1 hour at 90° C., and the filter residue obtained after filtration i...

Embodiment 2

[0075] (1) Put 1 gram of crushed corn stalks in a tube furnace, and carbonize at 300° C. to obtain 0.2 g of carbides, and the carbonization time is 2 hours;

[0076] (2) Place the carbide obtained in step (1) in an agate mortar and grind for 1 hour to grind evenly, get 0.6g of potassium hydroxide by mass ratio carbide: KOH=1:3 and mix with carbide to obtain a mixture;

[0077] (3) Move the mixture in step (2) to a tube furnace, heat the mixture to 500° C. at a heating rate of 5° C. / min under nitrogen protection, and hold the temperature for 1 hour to obtain a pre-product;

[0078] (4) After the pre-product prepared in step (3) is placed in an agate mortar and ground for 1 hour, it is mixed with 40 mL of 1mol / L hydrochloric acid, and water bathed for 1 hour at 80° C., and the filter residue obtained after filtration is washed with deionized water until Neutral, and dry at 60 ° C for 12 hours, you can get the amorphous activated carbon material.

[0079] The specific surface ar...

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