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A preparation method of carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth

A composite airgel and carbon nanofiber technology, applied in the field of composite materials, can solve the problems of material specific surface area limitation, achieve the effect of increasing specific surface area, good stability, and improving electrochemical performance

Active Publication Date: 2019-05-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the specific surface area of ​​the prepared material has a certain limit

Method used

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  • A preparation method of carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth
  • A preparation method of carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth
  • A preparation method of carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth

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Embodiment 1

[0022] 1) Cut the bacterial cellulose hydrogel into rectangles (1*3*2cm 3 ), soaked in deionized water for 24 hours, freeze-dried for 72 hours to obtain airgel, impregnated the airgel in a solution containing 0.1M cobalt chloride, 0.2M thiourea, and 1.0M urea at room temperature for 72 hours, and then The resulting composite hydrogel was frozen by immersion in liquid nitrogen, and then vacuum freeze-dried.

[0023] 2) Under a nitrogen atmosphere, heat the product obtained in step 1 to 200°C at a heating rate of 2°C / min, then to 220°C at a heating rate of 1°C / min, keep it warm for 1 hour, and then heat it at a rate of 1°C / min The heating rate was raised to 350°C, kept for 1 hour, and finally the temperature was raised to 900°C within 180 minutes. After natural cooling, the carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth was obtained.

[0024] 3) SEM testing was carried out using a FEI Quanta FEG 250 scanning electron microscope from Philips, t...

Embodiment 2

[0028] 1) Cut the bacterial cellulose hydrogel into rectangles (1*3*2cm 3 ), soaked in deionized water for 24 hours, freeze-dried for 72 hours to obtain airgel, impregnated the airgel in a solution containing 0.1M cobalt chloride, 0.2M thiourea, and 1.0M urea at room temperature for 72 hours, and then The resulting composite hydrogel was frozen by immersion in liquid nitrogen, and then vacuum freeze-dried.

[0029] 2) Under a nitrogen atmosphere, heat the product obtained in step 1 to 200°C at a heating rate of 2°C / min, then to 220°C at a heating rate of 1°C / min, keep it warm for 1 hour, and then heat it at a rate of 1°C / min The heating rate was raised to 350°C, kept for 1 hour, and finally the temperature was raised to 900°C within 180 minutes. After natural cooling, the carbon tube and carbon nanofiber composite airgel based on cobalt sulfide growth was obtained.

[0030] 3) SEM testing was carried out using a FEI Quanta FEG 250 scanning electron microscope from Philips, t...

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Abstract

The invention relates to a method for preparing composite aerogel of nanotubes growing based on cobalt sulfide and carbon nanofibers, and belongs to the field of composite materials. The method includes the steps that bacterial cellulose hydrogel is soaked in a mixed solution containing metal salt, urea and thiourea, and then the composite aerogel of the nanotubes growing based on metal sulfide and the carbon nanofibers is obtained through pyrolysis, wherein the composite aerogel is derived from bacterial cellulose. The preparation method has the advantages that the preparation process is simple, the method is environmentally friendly, energy consumption is low and large-scale preparation is achieved. Besides, a three-dimensional material prepared through the method has a porous network structure and good conductivity, carbon tubes growing on the basis of metal sulfide particles are wound on the carbon nanofibers to form a more complex three-dimensional network structure, and the specific surface area is greatly increased. The method has wide prospects in application fields like photoelectrocatalysis, electrochemistry and heavy metal ion adsorption.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube and carbon nanofiber composite airgel based on cobalt sulfide growth, and belongs to the field of composite materials. Background technique [0002] As one of the cobalt group sulfides, nano-cobalt sulfide is considered to be a particularly valuable material for research because of its excellent electrochemical performance in various functional systems. However, these metal sulfides have some disadvantages, such as low electrical conductivity, small surface area, and easy agglomeration. Studies have found that loading transition metal compounds on conductive carbon nanomaterials (such as graphene, carbon nanotubes, carbon nanofibers) can promote electron transfer, prevent particle aggregation, and enhance catalytic performance to a certain extent. In particular, heteroatom-doped carbon nanomaterials (such as N, S, P, etc.) can further promote the catalytic performance of oxygen reducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘婷郭耀芳孙克宁王芳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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