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Preparation method of MXene-based composite aerogel

A composite aerogel, nanocellulose technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry and other directions, can solve the problems of poor electrochemical performance, poor mechanical stability, etc., achieve good compression recovery ability, Electrochemical performance improvement, the effect of suppressing stacking

Active Publication Date: 2021-07-13
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of MXene-based composite airgel, to solve the problem that the prepared MXene-based composite airgel has poor mechanical stability and poor electrochemical performance in the prior art

Method used

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  • Preparation method of MXene-based composite aerogel
  • Preparation method of MXene-based composite aerogel
  • Preparation method of MXene-based composite aerogel

Examples

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Effect test

Embodiment 1

[0031] A preparation method of MXene-based composite airgel, comprising:

[0032] Put 1g of lithium fluoride into 20mL of hydrochloric acid (the concentration of hydrochloric acid is 9mol / L) and stir for 30min, then add 1g of precursor MAX to continue stirring and react. The reaction temperature is 35°C and the time is 24h. After the reaction , after ultrasonication and centrifugation, the centrifugation speed is 6000rpm, the upper layer suspension is taken, and MXene is obtained after freeze-drying;

[0033] Put 3g of nano-cellulose crystals into 50mL of deionized water, stir for 6h, and sonicate for 10min to obtain a dispersion of nano-cellulose crystals;

[0034] Add 1mL of perfluorosilane coupling agent into the nano-cellulose crystal dispersion, add dropwise acetic acid to adjust the pH to 5, and then place it in a hydrothermal kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 80°C and the time is After 12 hours of reaction, centrifuge at ...

Embodiment 2

[0038]Prepare MXene-based composite airgel according to the method of Example 1, the difference is that 1g of precursor MAX is added to continue stirring and the reaction time is 36h; the time of chemical crosslinking reaction is 13h; the rate of liquid nitrogen freezing is 10 °C / min.

Embodiment 3

[0040] Prepare MXene-based composite airgel according to the method of Example 1, the difference is that 1 g of precursor MAX is added to continue stirring and the reaction time is 48 h; the time of chemical cross-linking reaction is 16 h; the rate of liquid nitrogen freezing is 15 h °C / min.

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Abstract

The invention discloses a preparation method of MXene-based composite aerogel. The preparation method comprises the following steps: adding MXene into deionized water, and carrying out ultrasonic treatment and stirring to obtain MXene dispersion liquid; adding functionalized nano cellulose crystals into the MXene dispersion liquid, performing stirring, carrying out molecular self-assembly, adding polyurethane, continuously stirring and carrying out chemical crosslinking; and after the reaction is finished, carrying out liquid nitrogen freezing and ice crystal volatilization to obtain the MXene-based composite aerogel. The preparation method is characterized by taking the functionalized nano cellulose crystals as an assembling agent and a template, carrying out phase separation and self-assembly on the functionalized nano cellulose crystals and MXene two-dimensional nanosheets, then carrying out chemical crosslinking reaction with waterborne polyurethane, and then carrying out directional freeze-drying operation to obtain the MXene-based composite aerogel material with a three-dimensional directional internal pore channel structure. The MXene-based composite aerogel material not only has a super-elastic mechanical property, but also has an excellent electrochemical property.

Description

technical field [0001] The invention relates to the field of functional polymer airgel materials, in particular to a preparation method of MXene-based composite airgel. Background technique [0002] With the continuous progress of human society and the rapid development of industry, the world's demand for energy is showing explosive demand. However, the storage of traditional fossil fuels is limited and increasingly depleted; at the same time, the combustion of a large number of fossil fuels will produce a large amount of greenhouse gases and toxic substances, such as carbon dioxide, carbon monoxide and volatile organic compounds, which have caused serious damage to the global environment. Irreversible pollution and deterioration of the climate have had a great impact on human existence. Therefore, researchers began to seek sustainable and renewable clean energy. Among them, electrochemical energy storage, as an important research direction in new energy technology, has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C01B21/00C01B21/06C01B32/90
CPCB01J13/0091C01B32/90C01B21/00C01B21/06Y02E60/13
Inventor 付宇蔡晨阳
Owner NANJING FORESTRY UNIV
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