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Preparation method of N-doped graphene/graphene nanobelt composite aerogel

A graphene nanoribbon and composite airgel technology, applied in the field of composite materials, can solve the problems of high cost, complicated preparation process, and inability to obtain commercial application, achieve high porosity, simple preparation process, and reduce agglomeration force Effect

Pending Publication Date: 2021-01-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional method faces problems such as complex preparation process and high cost, and cannot be commercially applied.

Method used

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  • Preparation method of N-doped graphene/graphene nanobelt composite aerogel
  • Preparation method of N-doped graphene/graphene nanobelt composite aerogel
  • Preparation method of N-doped graphene/graphene nanobelt composite aerogel

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specific Embodiment approach 1

[0029] Specific embodiment one: what this embodiment records is a kind of preparation method of N-doped graphene / graphene nanoribbon composite airgel, described method comprises the following steps:

[0030] Step 1: preparing a graphene oxide dispersion and a graphene oxide nanoribbon dispersion with a concentration ≥ 10 mg / ml;

[0031] Step 2: Pre-reduction to construct a three-dimensional skeleton: Dilute the two dispersions obtained in Step 1 to 10 mg / ml, mix them with a reducing agent, pour them into a molding mold and heat and reduce them in a closed environment to obtain a sol;

[0032] Step 3: freezing and strengthening the three-dimensional porous network structure: transfer the sol obtained in step 2 into a freezer for rapid freezing and shaping;

[0033] Step 4: Thawing: Take out the sample in Step 3 together with the forming mold and heat and thaw it on the heating table. After the ice crystals completely disappear, the composite hydrogel is obtained;

[0034] Step...

specific Embodiment approach 2

[0036] Specific embodiment two: the preparation method of the N-doped graphene / graphene nanoribbon composite aerogel described in specific embodiment one, in step one, described graphene oxide dispersion liquid is by putting graphite in concentrated sulfuric acid, phosphoric acid The mixture is synthesized by reacting with potassium permanganate; the graphene oxide nanoribbon dispersion is obtained by longitudinally cutting carbon nanotubes. The advantage is that the prepared graphene oxide and nanobelts are rich in oxygen-containing functional groups, which play a positive role in the preparation and performance of materials.

specific Embodiment approach 3

[0037] Specific embodiment three: the preparation method of N-doped graphene / graphene nanoribbon composite aerogel described in specific embodiment one, described step two is specifically: the two kinds of dispersion liquids that step one obtains are diluted to 10mg respectively / ml Mix and stir at the speed of 100-3000r / min for 10-1200min; after adding the reducing agent, stir at a high speed of 100-3000r / min for 1-24h, then ultrasonically disperse at the frequency of 50KHz for 1-24h, and repeat the stirring and ultrasonic operation for 1-5 times; finally, pour the mixed liquid into a molding mold and heat and reduce it in a closed environment to form a sol with a three-dimensional porous network structure. The advantages are: through repeated stirring and ultrasonic waves, graphene oxide nanoribbons can be evenly distributed between graphene oxide sheets to play a good barrier effect, effectively avoid graphene agglomeration, and facilitate the overlapping of three-dimensiona...

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Abstract

The invention discloses a preparation method of N-doped graphene / graphene nanobelt composite aerogel, and belongs to the technical field of composite materials. The preparation method comprises the following steps: 1, preparing a graphene oxide dispersion liquid; 2, preparing a graphene oxide nanobelt dispersion liquid; 3, carrying out pre-reduction freezing evaporation drying treatment; and 4, carrying out high-temperature heat treatment. According to the method, by introducing the graphene oxide nanoribbons, more active sites are provided for N doping, and the N doping concentration can be increased; the three-dimensional porous structure of the aerogel can be regulated and controlled by the content of the graphene nanoribbons; and the N doping degree can adjust the electrical and thermal properties and the chemical activity of the material. The N-doped graphene / graphene nanobelt composite aerogel prepared by the method has ultralow density, high porosity and excellent thermal and electrical properties, and is expected to be applied to the fields of electromagnetic stealth, electrochemistry, catalysis, adsorption, water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of N-doped graphene / graphene nanoribbon composite airgel. Background technique [0002] In recent years, among many materials, carbon-based materials have been an important research content. Among carbon-based materials, carbon black, graphite, carbon fiber, carbon nanotubes, etc. have been extensively studied. Graphene is a new material of two-dimensional atomic crystal. Its special single-layer atomic structure makes it have excellent electrical, thermal and mechanical properties. It has broad applications in materials science, micro-nano processing, energy, biomedicine and drug delivery. Foreground, considered a future revolutionary material. Compared with traditional absorbing materials such as ferrite and carbon black, graphene has the characteristics of ultra-high specific surface area, low density, adjustable conductivity, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C01B32/198B82Y30/00B82Y40/00B01J13/00
CPCC01B32/184C01B32/194C01B32/198B82Y30/00B82Y40/00B01J13/0091
Inventor 程远静李宜彬
Owner HARBIN INST OF TECH
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