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Preparation method for high-specific capacitance activated carbon on the basis of HNO3 hydrothermal oxidizing modification

A high specific capacitance, hydrothermal oxidation technology, applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve problems such as conductivity decline, environmental pollution, activated carbon pore damage, etc., and achieve low cost and no equipment corrosion. , the effect of saving energy

Active Publication Date: 2017-07-14
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned patents, high-concentration nitric acid is often used to treat carbon materials. Although the content of surface functional groups increases sharply, it leads to the production of a large amount of yellow NO in the preparation process. 2 Smog not only causes serious environmental pollution, but also the pores of activated carbon itself are severely damaged and the conductivity decreases, so it is not suitable for use as an electrode material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Phenolic resin-based carbon (specific surface area 600m 2 g -1 ) to 500 mesh, and then carbon powder and concentration of 0.01mol / L HNO 3 and ethanol, press m 炭 (g): V 酸 (ml): V 乙醇 (ml) = 1g: 20ml: 60ml ratio, mix and stir evenly to obtain the mixed material, and then according to the quality of the carbon material: the volume of the hydrothermal reactor = 1g: 400ml, put the mixed material into the hydrothermal reactor, and set the speed to 250 rev / min, react at 180°C for 6h. Stand still, filter, wash and dry to get the product.

[0022] The modified carbon powder: acetylene black: vinylidene fluoride (mass ratio 8:1:1) is made into an electrode sheet, and a three-electrode test is composed of a platinum electrode and a Hg / HgO electrode. The test is carried out in 6M KOH, and the current density is 0.5A / g, its specific capacitance is 254.1F g -1 , when the current density is 20A / g, the specific capacity is 204.6F g -1 , compared to the specific capacitance of t...

Embodiment example 2

[0024] Phenolic resin-based carbon (specific surface area 740m 2 g -1 ) to 325 mesh, and then carbon powder with a concentration of 0.02mol / L HNO 3 and ethanol, press m 炭 (g): V 酸 (ml): V 乙醇 =1g: 18ml: 52ml proportioning, mixing and stirring evenly to obtain the mixed material, and then according to the quality of the carbon material: the volume of the hydrothermal reactor = 1g350ml, the mixed material is added to the hydrothermal reactor, and the speed is set to 200 rpm. Reaction at 170°C for 6h. Stand still, filter, wash and dry to get the product.

[0025] The modified carbon powder: acetylene black: vinylidene fluoride (mass ratio 8:1:1) is made into an electrode sheet, and a three-electrode test is composed of a platinum electrode and a Hg / HgO electrode. The test is carried out in 6M KOH, and the current density is 0.5A / g, its specific capacitance is 258.0F g -1 , when the current density is 20A / g, the specific capacity is 207.5F g -1 , compared to the specific c...

Embodiment example 3

[0027] Phenolic resin-based carbon (specific surface area 839m 2 g -1 ) to 400 mesh, and then carbon powder and HNO with a concentration of 0.05mol / L 3 and ethanol, press m 炭 (g): V 酸 (ml): V 乙醇 = 1g: 16ml: 54ml ratio, mix and stir evenly to obtain the mixed material, and then according to the mass of the carbon material: the volume of the hydrothermal reactor = 1g: 300ml, put the mixed material into the hydrothermal reactor, and set the speed at 180 rpm , Reacted at 160°C for 5h. Stand still, filter, wash and dry to get the product.

[0028] The modified carbon powder: acetylene black: vinylidene fluoride (mass ratio 8:1:1) is made into an electrode sheet, and a three-electrode test is composed of a platinum electrode and a Hg / HgO electrode. The test is carried out in 6M KOH, and the current density is 0.5A / g, its specific capacitance is 278.0F g -1 , when the current density is 20A / g, the specific capacity is 213.4F g -1 , compared to the specific capacitance of the...

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Abstract

A preparation method for high-specific capacitance activated carbon on the basis of HNO3 hydrothermal oxidizing modification includes the steps of: uniformly mixing and stirring a carbon material, nitric acid and ethanol according to the ratio of m<carbon> : V<acid> : V<ethanol> being 1 g : 5-20 ml : 40-60 ml to prepare a mixture material; according to the ratio of mass of carbon material to volume of a hydrothermal reaction kettle being 1-3 g : 200-400 ml, adding the mixture material to the hydrothermal reaction kettle, and performing a reaction at 100-180 DEG C for 3-6 h, rotation speed being 50-250 r / min; allowing the reaction product to stand, and filtering, washing and drying the reaction product to prepare the activated carbon. The activated carbon has high specific capacitance and is low in environment pollution.

Description

technical field [0001] The present invention relates to HNO-based 3 Preparation method of high specific capacitance activated carbon modified by hydrothermal oxidation. Background technique [0002] The rapid development of portable electronic devices has accelerated the research and development of new energy storage devices. As a new type of energy storage carrier, supercapacitors have the advantages of high power density, fast charging speed, long service life, and environmental protection. Therefore, they have become the research and development focus of scientists and engineers. The low specific capacitance of carbon electrode materials has become the core issue restricting the development of supercapacitors. [0003] Patent No. CN201310590031.2 "A Preparation Method of Graphene-Modified Activated Carbon" discloses a preparation method of graphene-modified activated carbon suitable for supercapacitors. This method uses traditional coconut shell activated carbon as raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/354C01B32/312H01G11/32
CPCC01P2006/40H01G11/32Y02E60/13
Inventor 李开喜张东东
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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