Preparation method of kapok-based hollow porous carbon microtubule or porous carbon microstrip

A porous carbon and kapok-based technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of underdeveloped gaps, low specific power, and poor rate performance of activated carbon electrodes, and achieve excellent capacitance performance and rate Improved performance, specific energy and rate performance, and better capacitance characteristics

Active Publication Date: 2018-03-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention is aimed at the problems of underdeveloped gaps, poor rate performance, and low specific power in the activated carbon electrode. It uses natural kapok as a raw material and undergoes pretreatment, cross-linking, carbonization, activation, and post-treatment process steps in sequence.

Method used

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  • Preparation method of kapok-based hollow porous carbon microtubule or porous carbon microstrip
  • Preparation method of kapok-based hollow porous carbon microtubule or porous carbon microstrip
  • Preparation method of kapok-based hollow porous carbon microtubule or porous carbon microstrip

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Ultrasound (power 100W) disperse kapok in a mixed solution composed of ethanol and 1.0wt% sodium chlorite solution (volume ratio of ethanol to sodium chlorite solution 1:2), soak for 3h, and then Ionized water cleaning, filtration, vacuum drying (temperature 60℃, drying time 15h) to obtain clean tubular kapok; or using ultrasound (power 100W) to disperse the kapok in a sodium hydroxide solution with a concentration of 1.0wt% and soak for 2h, Then filter and vacuum dry (temperature 60℃, drying time 15h) to get clean ribbon kapok;

[0033] (2) Vacuum immerse the above clean tubular kapok or ribbon kapok in a 3wt.% hydrogen phosphate diamine solution (relative vacuum degree of 0.7), and the mass ratio of kapok to hydrogen phosphate diamine is 1:1, followed by After immersing for 12 hours at 105℃ and drying at 105℃, the dried product obtained is pre-oxidized at low temperature under flowing air (to make the pre-oxidation more fully). The constant temperature is 200℃, and t...

Embodiment 2

[0037] (1) Ultrasonic (power 300W) disperse kapok in a mixed solution composed of ethanol and 1.3wt% sodium chlorite solution (volume ratio of ethanol to sodium chlorite solution 1:4), soak for 3h, and then Ionized water cleaning, filtration, vacuum drying (temperature 60℃, drying time 15h) to obtain clean tubular kapok; or using ultrasound (power 300W) to disperse the kapok in a sodium hydroxide solution with a concentration of 2.0wt% and soak for 2h, Then filter and vacuum dry (temperature 60℃, drying time 15h) to get clean ribbon kapok;

[0038] (2) Vacuum immerse the above clean tubular kapok or ribbon kapok in a 5wt.% hydrogen phosphate diamine solution (relative vacuum degree of 0.85), and the mass ratio of kapok to hydrogen phosphate diamine is 1:3. After immersing for 12 hours at 105℃ and drying at 105℃, the dried product obtained is pre-oxidized at low temperature under flowing air (to make the pre-oxidation more fully). The constant temperature is 250℃, and the heating ...

Embodiment 3

[0042] (1) Ultrasonic (power 500W) disperse kapok in a mixed solution composed of ethanol and 1.5wt% sodium chlorite solution (volume ratio of ethanol to sodium chlorite solution 1:6), soak for 3h, and then remove Ionized water cleaning, filtration, vacuum drying (temperature 60℃, drying time 15h) to obtain clean tubular kapok; or using ultrasound (power 500W) to disperse the kapok in a sodium hydroxide solution with a concentration of 2.0wt% and soak for 2h, Then filter and vacuum dry (temperature 60℃, drying time 15h) to get clean ribbon kapok;

[0043] (2) The above clean tubular kapok or ribbon kapok is vacuum immersed in a 7wt.% hydrogen phosphate diamine solution (relative vacuum degree 0.9), and the mass ratio of kapok to hydrogen phosphate diamine is 1:5. After immersing for 12 hours at 105℃ and drying at 105℃, the dried product obtained is pre-oxidized at low temperature under flowing air (to make the pre-oxidation more fully). The constant temperature is 250℃, and the h...

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Abstract

A preparation method of a kapok-based hollow porous carbon microtubule or porous carbon microstrip comprises the following steps: dispersing kapok in a mixed solution composed of ethanol and a sodiumchlorite solution by ultrasound for immersion, or dispersing kapok in a sodium hydroxide solution for immersion, filtering, vacuum-drying to obtain tubular kapok or strip-shaped kapok, impregnating the tubular kapok or strip-shaped kapok in a diammonium hydrogen phosphate solution, drying, carrying out preoxidation, carbonizing, washing, vacuum-drying to obtain cured tubular kapok or cured strip-shaped kapok, carrying out ultrasonic dispersion by impregnating the cured tubular kapok or cured strip-shaped kapok and phosphoric acid in deionized water, drying, and activating to obtain the kapok-based hollow porous carbon microtubule or porous carbon microstrip. The product has advantages of high rate capability and high specific power.

Description

Technical field [0001] The invention belongs to a method for preparing kapok-based hollow porous carbon microtubes or porous carbon microbands. Background technique [0002] Activated carbon has become the most commercially competitive electrode material for supercapacitors due to its high specific surface, developed pores, stable structure, abundant resources, and low price. Activated carbon is generally prepared from carbon-containing precursors through high-temperature carbonization and activation. At present, the precursors for preparing activated carbon mainly include coal, petroleum, wood, polymers and biomass materials. Among them, because of its wide sources of biomass, its reproducibility and its fine structure and highly regular geometric structure, more and more scientific researchers pay attention to it. [0003] Kapok is the most hollow natural fiber in nature. Its tube inner diameter is about 14μm, and the tube wall thickness is about 0.74μm, which is thin and trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342
Inventor 陈成猛曹玉芳姜东谢莉婧
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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