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Preparation method of bacterial cellulose-based carbon airgel

A technology of bacterial cellulose and airgel, which is applied in the direction of carbon preparation/purification, sol preparation, chemical instruments and methods, etc., can solve problems such as structural collapse and porous network structure, and achieve improved flexibility and elasticity, good The effect of high rate performance and good specific capacitance

Active Publication Date: 2022-05-10
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 airgel
  • Preparation method of bacterial cellulose-based carbon airgel
  • Preparation method of bacterial cellulose-based carbon airgel

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 nanomaterials, and in particular relates to a preparation method of bacterial cellulose-based carbon aerogel and its application in supercapacitors. The preparation method of the bacterial cellulose-based carbon aerogel of the present invention comprises the following steps: (1) dissolving tetramethylpiperidine oxide and sodium bromide in water, and stirring to obtain a mixed solution; (2) dispersing the bacterial cellulose Add above-mentioned mixed solution to the liquid, then add sodium hypochlorite aqueous solution and hydrochloric acid to react, add sodium hydroxide aqueous solution in the reaction process, obtain reaction product and wash with water; (3) add the mixed solution of water and tert-butanol again, stir to form uniform water (4) After the hydrogel is freeze-dried, carbonized to obtain bacterial cellulose-based carbon aerogel. The method of the invention can improve the dispersibility of bacterial cellulose and enhance its structural stability, thereby preparing carbon aerogels with high mechanical strength and high flexibility, and providing electrode materials with excellent electrical properties for supercapacitors.

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 Patents(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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