Preparation method of bacterial cellulose-based carbon aerogel

A bacterial cellulose and aerogel technology, applied in carbon preparation/purification, sol preparation, chemical instruments and methods, etc., can solve problems such as structural collapse and porous network structure, reduce structural shrinkage, and optimize graphite Chemical structure, conductivity, and the effect of high specific surface area

Active Publication Date: 2020-12-22
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during high temperature pyrolysis, the porous network structure composed of fibers connecting BC is fragile, and a large number of O atoms and OH groups in the cellulose chains further lead to a large number of defects in the carbon network. exacerbated the collapse of the structure

Method used

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  • Preparation method of bacterial cellulose-based carbon aerogel
  • Preparation method of bacterial cellulose-based carbon aerogel
  • Preparation method of bacterial cellulose-based carbon aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Mix and dissolve 0.016g TEMPO and 0.1g NaBr in 100mL deionized water, and stir for 1 hour to obtain a mixed solution;

[0056] (2) Add 14mg of BC dispersion to the above mixed solution, then add 2mL of 6-14% NaClO aqueous solution and 2mL of hydrochloric acid at room temperature, then add 0.5M NaOH aqueous solution to react, and continue to add dropwise to make the pH of the reaction solution Keep it at about 10.0, and the obtained reaction product is thoroughly washed with deionized water;

[0057] (3) Add 25mL of a mixed solution of water and tert-butanol (5:1, v / v), and stir at room temperature for 2 hours to form a uniform hydrogel;

[0058] (4) The obtained hydrogel was pre-frozen in liquid nitrogen for 24h, then put into a vacuum freeze dryer for drying treatment for 48h, then put the dried aerogel into a tube-type resistance furnace for high-temperature carbonization, and then 2 In the atmosphere, the temperature was raised to 800°C at a rate of 3°C / min, kep...

Embodiment 2

[0068] (1) Mix and dissolve 0.016g TEMPO and 0.1g NaBr in 100mL deionized water, and stir for 1 hour to obtain a mixed solution;

[0069] (2) Add 14mg of BC dispersion to the above mixed solution, then add 6-14% NaClO aqueous solution 2mL and hydrochloric acid 2mL to react at room temperature, then add 0.5M NaOH aqueous solution to react, and continue to add dropwise to make the reaction solution The pH value is kept at about 10.0, and the obtained reaction product is thoroughly washed with deionized water;

[0070] (3) Add 25mL of a mixed solution of water and tert-butanol (8:1, v / v), and stir at room temperature for 2 hours to form a uniform hydrogel;

[0071] (4) The obtained hydrogel was pre-frozen in liquid nitrogen for 24h, then put into a vacuum freeze dryer for drying treatment for 48h, then put the dried aerogel into a tube-type resistance furnace for high-temperature carbonization, and then 2 In the atmosphere, the temperature was raised to 800°C at a rate of 3°C / mi...

Embodiment 3

[0074] (1) Mix and dissolve 0.016g TEMPO and 0.1g NaBr in 100mL deionized water, and stir for 1 hour to obtain a mixed solution;

[0075] (2) Add 14mg of BC dispersion to the above mixed solution, then add 6-14% NaClO aqueous solution 2mL and hydrochloric acid 2mL to react at room temperature, then add 0.5M NaOH aqueous solution to react, and continue to add dropwise to make the reaction solution The pH value is kept at about 10.0, and the obtained reaction product is thoroughly washed with deionized water;

[0076] (3) Add 25 mL of a mixed solution of water and tert-butanol (3:1, v / v), and stir at room temperature for 2 hours to form a uniform hydrogel;

[0077] (4) The obtained hydrogel was pre-frozen in liquid nitrogen for 24h, then put into a vacuum freeze dryer for drying treatment for 48h, then put the dried aerogel into a tube-type resistance furnace for high-temperature carbonization, and then 2 In the atmosphere, the temperature was raised to 800°C at a rate of 3°C / m...

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Abstract

The invention belongs to the technical field of biological nano materials, and particularly relates to a preparation method of bacterial cellulose-based carbon aerogel and application of the bacterialcellulose-based carbon aerogel in a supercapacitor. The preparation method of the bacterial cellulose-based carbon aerogel comprises the following steps: (1) dissolving tetramethylpiperidine oxide and sodium bromide in water, and conducting stirring to obtain a mixed solution; (2) adding a bacterial cellulose dispersion liquid into the mixed solution, then adding a sodium hypochlorite aqueous solution and hydrochloric acid for reaction, adding a sodium hydroxide aqueous solution in the reaction process to obtain a reaction product, and cleaning the reaction product with water; (3) adding a mixed solution of water and tert-butyl alcohol, and conducting stirring to form uniform hydrogel; and (4) freeze-drying the hydrogel, and conducting carbonizing to obtain the bacterial cellulose-based carbon aerogel. According to the method disclosed by the invention, the dispersity of the bacterial cellulose can be improved, and the structural stability of the bacterial cellulose is enhanced, so that the carbon aerogel with high mechanical strength and high flexibility is prepared, and an electrode material with excellent electrical properties is provided for a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of bionano materials, and relates to a carbon airgel material, in particular to a preparation method of bacterial cellulose-based carbon airgel. Background technique [0002] Carbon aerogel (CA), a lightweight, shape-variable nanoscale porous carbon material, has attracted extensive attention in recent years due to its excellent physical and chemical properties such as high porosity, large theoretical specific surface area, and high electrical conductivity. The unique structural properties enable carbon aerogels to be widely used in various fields of catalysis: heat insulation, strain sensors, adsorption, capacitive deionization technology, and can also be used as electrode materials for energy storage. Carbon aerogel has three-dimensional network pores, and its high specific surface area enables its own carbon skeleton to promote electron transfer and provide abundant activation sites. At the same time, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J13/00H01G11/24H01G11/34
CPCC01B32/05B01J13/0004H01G11/34H01G11/24Y02E60/13
Inventor 刘乔马宇杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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