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Biomass-based porous carbon material, preparation method thereof, and application thereof in supercapacitor

A technology of porous carbon materials and biomass, which is applied in the fields of hybrid capacitor electrodes, carbon compounds, chemical instruments and methods, etc., can solve problems such as the development limitation of carbon materials, and achieve the effects of low price, reduced production cost and good rate capability.

Inactive Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortage of fossil energy in recent years, the development of carbon materials has been limited to a certain extent.

Method used

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  • Biomass-based porous carbon material, preparation method thereof, and application thereof in supercapacitor
  • Biomass-based porous carbon material, preparation method thereof, and application thereof in supercapacitor
  • Biomass-based porous carbon material, preparation method thereof, and application thereof in supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a biomass-based porous carbon material, comprising the steps of:

[0037] (1) drying the rice stalks in an oven at 60°C for 12 hours and pulverizing them;

[0038] (2) Pre-carbonize the crushed rice stalks for later use. The pre-carbonization process is to raise the temperature from room temperature to 300° C. at a rate of 5° C. / min, and keep it warm for 90 minutes; add a certain amount of KOH to the container, and add a small amount of water to KOH was dissolved, and the pre-carbonized rice straw was added to the container (the mass ratio of KOH and rice straw was 1:1), stirred evenly, and dried in an oven at 60°C for 12 hours;

[0039] (3) Carrying out the carbonization activation of the above-mentioned dried rice straw and KOH mixture in an argon atmosphere, raising the temperature from room temperature to a target temperature of 750° C. at a rate of 3° C. / min, and keeping it warm for 2 hours to obtain carbides;

[0040] (4) The carbide was wa...

Embodiment 2

[0042] A method for preparing a biomass-based porous carbon material, comprising the steps of:

[0043] (1) drying the rice stalks in an oven at 60°C for 12 hours and pulverizing them;

[0044] (2) Add a certain quality of KHCO into the beaker 3 , adding a small amount of water will KHCO 3 Dissolve, add rice stalks to the beaker (KHCO 3 The mass ratio with the rice stalk is 5:1) and stirred evenly, and dried in an oven at 60°C for 12 hours;

[0045] (3) the above-mentioned dried rice straw and KHCO 3The mixture was carbonized and activated in a nitrogen atmosphere, and the temperature was raised from room temperature to a target temperature of 1000 °C at a rate of 3 °C / min, and kept for 2 hours;

[0046] (4) The carbide was washed 4 times with 20% sodium hydroxide by mass fraction, then washed 2 times with 1M hydrochloric acid, and finally washed to neutrality, and dried in an oven at 60°C for 12 hours to obtain a rice stalk-based porous carbon material that was Substance...

Embodiment 3

[0048] A method for preparing a biomass-based porous carbon material, comprising the steps of:

[0049] (1) drying the rice stalks in an oven at 60°C for 12 hours and pulverizing them;

[0050] (2) Add a certain quality of KHCO to the container 3 , adding a small amount of water will KHCO 3 Dissolve, add rice stalks to the beaker (KHCO 3 The mass ratio with the rice straw is 1:1), stir evenly, and dry in a 60°C oven for 12 hours;

[0051] (3) the above-mentioned dried rice straw and KHCO 3 The mixture was carbonized and activated in an argon atmosphere, and the temperature was raised from room temperature to a target temperature of 800°C at a rate of 3°C / min, and kept for 2 hours;

[0052] (4) The carbide was washed 4 times with 20% sodium hydroxide by mass fraction, then washed 2 times with 1M hydrochloric acid, and finally washed to neutrality, and dried in an oven at 60°C for 12 hours to obtain a rice stalk-based porous carbon material that was Substance-based porous c...

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Abstract

The invention belongs to the field of material science and energy storage and discloses a biomass-based porous carbon material, a preparation method thereof, and an application thereof in a supercapacitor. The method includes the steps of: 1) drying and crushing rice straws; 2) non-carbonizing or pre-carbonizing the crushed rice straws, uniformly mixing the rice straws with an activator water solution and drying the mixture, or non-carbonizing or pre-carbonizing the crushed rice straws and directly mixing the rice straws with a solid activator uniformly to produce a mixed product; and 3) placing the mixed product in a tube furnace to perform carbonizing activation in an inert gas atmosphere at high temperature; 4) washing the carbonized product in an acid solution and an alkali solution, and washing the carbonized product with deionized water to neutral, and drying the washed product to prepare the biomass-based porous carbon material. The porous carbon material has excellent supercapacitor performance and is simple in preparation method.

Description

technical field [0001] The invention belongs to the field of material science and energy storage, and specifically relates to a biomass-based porous carbon material with excellent supercapacitor performance, a preparation method thereof, and an application in supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and rechargeable batteries. Due to its advantages of high power density, long cycle life and high charge and discharge rate, it has always been a hot research and development topic. The electrode material is the most important part that determines the performance of supercapacitors. Among them, the porous activated carbon material has become the most commercially competitive electrode material due to its advantages such as high stability, long life, abundant raw material sources, and good electrical conductivity. In recent years, due to the shortage of fossil energy, the development of carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/348C01B32/324H01G11/24H01G11/34H01G11/44
CPCY02E60/13H01G11/24C01P2004/03C01P2006/12C01P2006/16C01P2006/40H01G11/34H01G11/44
Inventor 钟林新陈泽虹彭新文
Owner SOUTH CHINA UNIV OF TECH
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