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A kind of preparation method of azobenzene-graphene energy storage material containing hyperbranched structure

A technology of energy storage materials and branched structures, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of short half-life, low energy density, limiting the application of azobenzene molecules, etc., and achieve long half-life and high storage The effect of energy density

Inactive Publication Date: 2020-09-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low energy density and short half-life limit the application of azobenzene molecules in light and heat storage.

Method used

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  • A kind of preparation method of azobenzene-graphene energy storage material containing hyperbranched structure
  • A kind of preparation method of azobenzene-graphene energy storage material containing hyperbranched structure
  • A kind of preparation method of azobenzene-graphene energy storage material containing hyperbranched structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Ultrasonic dispersion of 50mg graphene in a mixed solution of 50ml absolute ethanol and 10ml deionized water, add 10ml 3-aminopropyltriethoxysilane dropwise, then stir the reaction in an oil bath at 60°C, condense and reflux 8h. Finally, the unreacted coupling agent in the product was filtered and washed four times with deionized water and absolute ethanol, respectively, and vacuum-dried at 40° C. for 12 hours to obtain a dry product. Disperse 40 mg of the product in 50 ml of ethanol solution, add 10 ml of poly-dipentaerythritol tetraacrylate, stir at room temperature for 3 h by Michael addition reaction, and wash with absolute ethanol for 4 times to remove unreacted poly-dipentaerythritol tetraacrylate , and obtained hyperbranched graphene hybrids containing carbon-carbon double bonds after vacuum drying. Finally, 50 mg of the graphene hybrid was dispersed in 50 ml of absolute ethanol, then 10 ml of tris(2-aminoethyl)amine was added, stirred at room temperature for...

Embodiment 2

[0031]1) Ultrasonic dispersion of 50mg graphene in a mixed solution of 50ml absolute ethanol and 10ml deionized water, add 15ml 3-aminopropyltriethoxysilane dropwise, then stir the reaction in an oil bath at 60°C, condense and reflux 10h. Finally, the unreacted coupling agent in the product was filtered and washed four times with deionized water and absolute ethanol respectively, and vacuum-dried at 50° C. for 12 hours to obtain a dry product. Disperse 40 mg of the product in 50 ml of ethanol solution, add 15 ml of poly-dipentaerythritol tetraacrylate, stir at room temperature for 3 h by Michael addition reaction, and wash with absolute ethanol for 4 times to remove unreacted poly-dipentaerythritol tetraacrylate , and obtained hyperbranched graphene hybrids containing carbon-carbon double bonds after vacuum drying. Finally, 50 mg of the graphene hybrid was dispersed in 50 ml of absolute ethanol, then 15 ml of tris(2-aminoethyl)amine was added, stirred at room temperature for ...

Embodiment 3

[0035] 1) Ultrasonic dispersion of 50 mg of graphene in a mixed solution of 50 ml of absolute ethanol and 10 ml of deionized water, adding 20 ml of 3-aminopropyltriethoxysilane dropwise, then stirring the reaction in an oil bath at 60 ° C, condensing and refluxing 12h. Finally, the unreacted coupling agent in the product was filtered and washed six times with deionized water and absolute ethanol, respectively, and vacuum-dried at 50° C. for 24 hours to obtain a dry product. Disperse 40 mg of the product in 50 ml of ethanol solution, add 20 ml of poly-dipentaerythritol tetraacrylate, stir at room temperature for 5 h by Michael addition reaction, and wash with dehydrated alcohol for 6 times to remove unreacted poly-dipentaerythritol tetraacrylate , and obtained hyperbranched graphene hybrids containing carbon-carbon double bonds after vacuum drying. Finally, 50 mg of the graphene hybrid was dispersed in 50 ml of absolute ethanol, then 20 ml of tris(2-aminoethyl)amine was added,...

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Abstract

The invention relates to a preparation method of an azobenzene-graphene energy storage material containing hyperbranched structures. The preparation method comprises the steps: firstly, primary aminegroups are introduced into the surface of graphene through silane coupling; then the primary amine groups are successively grafted with dipentaerythritol hexaacrylate and tri(2-amino)ethylamine layerby layer in a dendritic growing mode through a Michael addition reaction, and the Michael addition reaction is repeated to obtain a dendritic hyperbranched graphene hybrid with the surface containingthe large number of primary amine groups; and finally, a final product is obtained through covalent grafting of the dendritic hyperbranched graphene hybrid and azobenzene. The preparation method has the novelty that the hyperbranched structures are introduced into an azobenzene-graphene energy storage system for the first time, and the energy storage property of the energy storage material is gradually improved along with dendritic growing of the hyperbranched structures; and the stored energy density of the energy storage material containing the three layers of hyperbranched structures reaches up to 104 W h kg<-1> and is more than three times the stored energy density of azobenzene molecules (32 W h kg<-1>), and meanwhile the energy storage material has good cycling stability and is expected to be applied to solar heat storage.

Description

technical field [0001] The invention belongs to the field of new energy materials and provides a preparation method of an azobenzene-graphene energy storage material containing a hyperbranched structure. Background technique [0002] With the rapid development of the world economy and the shortage of fossil energy, it is urgent to develop new energy to meet the growing global energy demand. Solar thermal storage materials are a closed and reversible circulatory system, and at the same time have the characteristics of non-polluting, renewable, and endless sources of solar energy, and have very important research value and application prospects. Molecular-level photothermal storage materials, such as synergistically converted norbornadiene, fullvalene metal compounds, and cis-trans isomeric azobenzene, can effectively realize solar energy storage and conversion, and have attracted widespread attention. Among them, due to the difficulty in synthesizing synergistic conversion m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K5/14
Inventor 王国杰徐兴堂
Owner UNIV OF SCI & TECH BEIJING
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