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Boron-doped graphene aerogel and preparation method and application thereof

A technology of graphene airgel and boron doping, which is applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of lack of full utilization of the electrochemical performance of graphene airgel, and achieve excellent pure capacitance behavior , Excellent rate performance, long cycle life effect

Pending Publication Date: 2021-02-23
SHAANXI SCI TECH 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 overcome the shortcoming of above-mentioned prior art, provide a kind of boron-doped graphene airgel and its preparation method and application, to solve the lack of fully utilizing graphene airgel electrochemical performance in the prior art question

Method used

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  • Boron-doped graphene aerogel and preparation method and application thereof
  • Boron-doped graphene aerogel and preparation method and application thereof
  • Boron-doped graphene aerogel and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1) Mix 100mg of natural graphite powder with 20mL of concentrated sulfuric acid, stir magnetically for 30min, and then add 0.5g of sodium nitrate. After the mixture was cooled to 0°C, 3g of potassium permanganate was slowly added, and heated in a water bath at 40°C for 30 minutes to form a mixed thick slurry. Then add 70 mL of deionized water and 10 mL of H 2 o 2 , the resulting mixed solution was washed with 40 mL of dilute hydrochloric acid, and finally centrifuged at high speed, and the centrifuged washed solution was ultrasonically dispersed in deionized water for 3 h to obtain a GO dispersion with a molar concentration of 1 mg / mL.

[0043] 2) Evenly mix the GO dispersion with a concentration of 1mg / ml and its mass of 15% boric acid, transfer it to a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it and put it into a 180°C electric constant temperature blast drying oven , the reaction time is 12h, after it is naturally cooled to room temp...

Embodiment 2

[0045] 1) Mix 200mg of natural graphite powder and 20mL of concentrated sulfuric acid, stir magnetically for 30min, and then add sodium nitrate. After the mixture was cooled to 0°C, potassium permanganate was slowly added, and heated in a water bath at 35°C for 30 minutes to form a mixed thick slurry. Then add deionized water and H 2 o 2 , the resulting mixed solution was washed with dilute hydrochloric acid, and finally centrifuged at high speed, and the centrifuged washed solution was ultrasonically dispersed in deionized water for 3 hours to obtain a GO dispersion.

[0046] 2) Evenly mix the GO dispersion with a concentration of 2mg / ml and its mass of 15% boric acid, transfer it to a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it and put it into a 180°C electric constant temperature blast drying oven , the reaction time is 12h, after it is naturally cooled to room temperature, it is taken out for later use. After the surface of the graphene i...

Embodiment 3

[0050] 1) Mix 300mg of natural graphite powder and 20mL of concentrated sulfuric acid, stir magnetically for 30min, and then add 0.5g of sodium nitrate. After the mixture was cooled to 0°C, 3g of potassium permanganate was slowly added, and heated in a water bath at 36°C for 30 minutes to form a mixed thick slurry. Then add 70mL deionized water and 10mLH 2 o 2 , the resulting mixed solution was washed with dilute hydrochloric acid, and finally centrifuged at high speed, and the centrifuged washed solution was ultrasonically dispersed in deionized water for 3 hours to obtain a GO dispersion.

[0051] 2) Evenly mix the GO dispersion with a concentration of 3 mg / ml and its mass of 15% boric acid, transfer it to a polytetrafluoroethylene-lined stainless steel reaction kettle, seal it and put it into a 180°C electric constant temperature blast drying oven , the reaction time is 12h, after it is naturally cooled to room temperature, it is taken out for later use. After the surfac...

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Abstract

The invention provides boron-doped graphene aerogel and a preparation method and application thereof. The preparation method includes the steps that graphene oxide serves as a carbon source, boric acid serves as a boron source, and graphene dispersion liquid with different concentrations is prepared, and the stable and high-performance boron-doped graphene aerogel is prepared by using a simple one-step hydrothermal synthesis method. The product obtained by hydrothermal reaction has a special three-dimensional porous structure, and the communicated mesopores on the surface of the boron-doped graphene aerogel inhibit the agglomeration phenomenon of the graphene sheet layer, thereby greatly enhancing the specific surface area of the macroscopic graphene material. Meanwhile, the clearly-layered three-dimensional porous structure can improve the ion transmission efficiency, so that the performance of the boron-doped graphene aerogel as a supercapacitor electrode is improved.

Description

【Technical field】 [0001] The invention belongs to the field of supercapacitors and semiconductor optoelectronic devices, and relates to a boron-doped graphene aerogel and a preparation method and application thereof. 【Background technique】 [0002] Graphene is a new type of two-dimensional material with a thickness of only 0.334nm. It has the characteristics of high thermal conductivity, high electrical conductivity, large specific surface area and easy modification of surface chemistry. Compared with traditional porous carbon materials, graphene has properties including high High electrical conductivity (104~106S / m), large specific surface area (~2675m 2 / g), high Young's modulus (~1TPa) and high fracture strength (~130GPa), graphene is a semi-metal / semiconductor material with zero band gap, which directly leads to the lower switching ratio of graphene And large leakage current, intrinsic graphene has few functional groups and poor compatibility with organic solvents, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/22C01B2204/24
Inventor 于琦蒋剑超任帅姜立运
Owner SHAANXI SCI TECH UNIV
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