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Nanopore grapheme, its preparation method and application

A graphene and nanopore technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as inability to stably disperse, and achieve the effects of rapid method, increased carboxyl group content, and easy preparation and application.

Active Publication Date: 2013-05-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, chemically converted graphene is neither soluble nor stably dispersed in conventional solvents
Therefore, it cannot be processed and formed by a simple method

Method used

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  • Nanopore grapheme, its preparation method and application
  • Nanopore grapheme, its preparation method and application
  • Nanopore grapheme, its preparation method and application

Examples

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Embodiment 1

[0032] The aqueous dispersion of chemically converted graphene with a concentration of 0.25 mg / mL was refluxed in 8M nitric acid solution at 100° C. for 12 hours, filtered by suction and washed with water until neutral to obtain the nanoporous graphene provided by the present invention.

[0033] Wherein, the graphene of described chemical conversion is prepared according to the following method:

[0034] 1) Preparation of graphene oxide: 3.3g of natural graphite powder (325 mesh), 1.5g of sodium nitrate and 70ml of 98wt% concentrated sulfuric acid were mixed in an ice-water bath, and after stirring evenly, 9.0g of potassium permanganate was slowly added. Raise the temperature of the system to 35°C, keep it stable for half an hour, add 150ml of deionized water, stir at 90°C for 15 minutes, add 500ml of deionized water, 15ml of 30wt% H 2 o 2 aqueous solution. The resulting bright yellow solution was filtered and washed with 250 mL of 1:10 aqueous HCl. The obtained solid was d...

Embodiment 2

[0043] The aqueous dispersion of chemically converted graphene with a concentration of 0.25mg / mL was refluxed in 16M aqueous nitric acid solution at 100°C for 12h, filtered by suction and washed with water until neutral to obtain the nanoporous graphene provided by the present invention.

[0044] Wherein, the graphene of described chemical conversion is prepared according to the following method:

[0045] 1) Preparation of graphene oxide: 3.30g of natural graphite powder (325 mesh), 1.5g of sodium nitrate and 70ml of 98wt% concentrated sulfuric acid were mixed in an ice-water bath, and after stirring evenly, 9.0g of potassium permanganate was slowly added. Raise the temperature of the system to 35°C, keep it stable for half an hour, add 150ml of deionized water, stir at 90°C for 15 minutes, add 500ml of deionized water, 15ml of 30wt% H 2 o 2 aqueous solution. The resulting bright yellow solution was filtered and washed with 250 mL of 1:10 aqueous HCl. The obtained solid was...

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Abstract

The invention discloses nanopore grapheme, its preparation method and application. In the graphene, the aperture of the nanopore is 20-100nm, the interlamellar spacing is 3.60-3.75 angstroms, the carboxyl content is 7-10%, and the electrical conductivity is 185-435S / cm. The preparation method comprises the steps of: dispersing chemically converted graphene in a nitric acid water solution to undergo a reflux reaction, after the reaction, conducting washing to neutrality, and performing drying, thus obtaining the graphene. Being convenient and practicable, the method can be used for mass production. The obtained material can be widely used for preparation of graphene nanocomposite materials, transparent conducting electrodes, and energy storage devices (such as super capacitors, lithium ion batteries, and solar batteries, etc.).

Description

technical field [0001] The invention relates to a nanoporous graphene, a preparation method and application thereof. Background technique [0002] Graphene, that is, single-layer graphite, is made of sp 2 A new type of carbon material in which hybridized carbon atoms are interconnected to form a two-dimensional honeycomb structure with a monolayer thickness. Graphene has set off a huge research boom in the field of new materials with its unique electrical, mechanical, optical, mechanical, and thermal properties. The commonly used preparation methods of graphene include mechanical exfoliation, chemical vapor deposition, redox, solution heat exfoliation, etc. At present, the most commonly used, effective and macro-preparation method of graphene in the laboratory is to prepare graphene oxide through chemical oxidation and exfoliation, and then obtain graphene through chemical reduction of graphene oxide. This type of graphene is called chemically converted or chemically modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/194
Inventor 石高全王西鸾李春
Owner TSINGHUA UNIV
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