Method for preparing porous carbon based nanomaterial through carbon dioxide conversion

A technology of nanomaterials and carbon dioxide, applied in the direction of carbon nanotubes, nanocarbons, nanotechnology, etc., can solve the problems of poor controllability of carbon-based nanomaterials, and achieve the effect of simple and controllable preparation process, easy industrial production, and low cost

Active Publication Date: 2013-10-02
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All in all, the current preparation of carbon-based nanomaterials by carbon dioxide conversion is less controllable

Method used

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  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion
  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion
  • Method for preparing porous carbon based nanomaterial through carbon dioxide conversion

Examples

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Effect test

Embodiment 1

[0028] Place the magnesium metal powder in a high-temperature furnace, raise it to 600°C at a heating rate of 10° / min under an argon protective atmosphere, and then introduce CO 2 Atmosphere, CO 2 The ratio of flow rate to Ar gas is 1:1, CO is turned off after 30 minutes of reaction 2 Airflow, cooling to room temperature in an argon atmosphere, black powder is obtained. The resulting black powder is reacted with a hydrochloric acid solution with a concentration of 8 mol / L for 12 hours, then fully washed with deionized water to neutrality, and dried to obtain porous graphene. among them Figure 1a Shows that graphene has a sheet-like structure, Figure 1b It shows that graphene has a rich pore structure. Figure 2a Is an atomic force microscope photo of porous graphene, Figure 2b It is proved that the thickness of the graphene sheet is about 0.7nm. image 3 The middle curve (a) is the pore size distribution diagram of porous graphene, with an average pore size of 7.9 nm.

Embodiment 2

[0030] Put the metal magnesium powder in a high-temperature furnace, raise it to 500°C at a heating rate of 5° / min under an argon atmosphere, and then introduce CO 2 Atmosphere, CO 2 The ratio of flow rate to Ar gas is 4:1, and CO is turned off after 60 minutes of reaction 2 Airflow, cooling to room temperature in an argon atmosphere, black powder is obtained. The obtained black powder is reacted with a nitric acid solution with a concentration of 2mol / L for 24h, and then fully washed with deionized water to neutrality, and dried to obtain porous graphene.

Embodiment 3

[0032] Place the metallic magnesium strip in a high-temperature furnace, and raise it to 650°C at a heating rate of 8° / min under an argon atmosphere, and then introduce CO 2 Atmosphere, CO 2 The ratio of flow rate to Ar gas is 1:4, and CO is turned off after 5 minutes of reaction 2 Airflow, cooling to room temperature in an argon atmosphere, black powder is obtained. The obtained black powder is reacted with a sulfuric acid solution with a concentration of 6 mol / L for 20 hours, and then fully washed with deionized water to neutrality, and dried to obtain porous graphene.

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Abstract

The invention relates to a method for preparing a porous carbon based nanomaterial through carbon dioxide conversion. The method comprises the following steps: 1, placing metallic magnesium in a high temperature furnace, heating the metallic magnesium in the argon protection atmosphere to 500-650DEG C in a heating rate of 5-10DEG C / min, letting in CO2 according to a CO2:Ar flow ratio of 1:4-4:1, reacting for 5-30min, closing the CO2 flow, and cooling in the argon atmosphere to room temperature to obtain black powder; and 2, reacting the black powder with an acid solution having a concentration of 2-8mol / L for 12-24h, fully washing with deionized water to neutrality, and drying to obtain porous graphene. A product obtained in step 1 when the reaction temperature is 700-900DEG C is porous carbon nanotubes, and a product obtained in step 1 when the reaction temperature is 950-1100DEG C is hollow carbon nanocubes.

Description

Technical field [0001] The invention relates to a method for preparing porous carbon-based nano materials. Background technique [0002] Carbon-based nanomaterials refer to carbon materials with at least one dimension of less than 100nm in the dispersed phase. The carbon-based nanomaterials that have been reported in the literature mainly include: carbon nanotubes, nano-carbon spheres, hollow carbon spheres and carbon nanofibers, as well as a new type of carbon nanomaterial-graphene discovered recently. Carbon nanomaterials have the characteristics of high conductivity, large specific surface area, and very stable chemical properties, and they have a wide range of applications in the fields of biosensing, catalysis, and energy storage. The commonly used methods for preparing carbon nanomaterials mainly include: chemical vapor deposition, arc discharge, laser ablation, and solid-phase pyrolysis. [0003] As a new technology, the preparation of carbon nanomaterials by carbon dioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/15C01B32/16C01B32/184
Inventor 张熊张海涛马衍伟孙现众
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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