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Method for modifying three-dimensional graphene material with carbon nano-dots

A technology of nano carbon dots and graphene, applied in the fields of chemical power supply and nano materials, can solve the problems affecting the application of graphene, and achieve the effect of large specific surface, maintaining structure, and facilitating de-intercalation

Inactive Publication Date: 2016-09-28
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the reduction process of graphene oxide, the formation of supramolecular system can effectively prevent the agglomeration of graphene, but only the formation of supramolecular system can still make graphene agglomerate, thus affecting the application of graphene

Method used

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  • Method for modifying three-dimensional graphene material with carbon nano-dots

Examples

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Embodiment 1

[0033] A method for preparing a three-dimensional graphene material modified by nano-carbon dots, comprising the following steps:

[0034] (1) Preparation of graphene oxide: Graphene oxide was prepared by the improved Hummers method; appropriate amount of natural graphite and sodium nitrate were mixed, at low temperature, a certain amount of sulfuric acid and potassium permanganate were added, and reacted for a period of time. Then add deionized water, raise the temperature to 90° C., and continue the reaction for a period of time. Cool to room temperature, wash with dilute hydrochloric acid and deionized water, and dry to obtain graphene oxide.

[0035] (2) Preparation of the supramolecular sol system of graphene oxide and β-cyclodextrin containing sodium carbonate: take 10 g of graphene oxide, add it to 1 L of water, and ultrasonicate for 6 h to form a sol; then add 1 g of β-cyclodextrin Dissolve in graphene oxide sol with fine stirring, then add 2mL 1mol L -1 The sodium c...

Embodiment 2

[0039] A method for preparing a three-dimensional graphene material modified by nano-carbon dots, comprising the following steps:

[0040] (1) Preparation of graphene oxide: same as step (1) in Example 1.

[0041] (2) Preparation of sodium carbonate-containing graphene oxide and crown ether supramolecular sol system: Take 10 g of graphene oxide, add it to 1 L of water, and sonicate for 6 h to form a sol. Then add 1 g of crown ether and stir to dissolve in the graphene oxide sol, then add 2 mL of 1mol L -1 The sodium carbonate solution was stirred evenly and ultrasonicated for 30 minutes to obtain a graphene oxide and crown ether supramolecular sol system containing sodium carbonate.

[0042] (3) Preparation of three-dimensional graphene materials modified by nano-carbon dots: the supramolecular sol system containing sodium carbonate was frozen in the refrigerator for 24 h, and then dried in a freeze dryer for 48 h. Put the dried sample into the calcination furnace, first at ...

Embodiment 3

[0045] A method for preparing a three-dimensional graphene material modified by nano-carbon dots, comprising the following steps:

[0046] (1) Preparation of graphene oxide: same as step (1) in Example 1.

[0047] (2) Preparation of the supramolecular sol system of graphene oxide and β-cyclodextrin containing sodium bicarbonate: Take 10 g of graphene oxide, add it to 1 L of water, and sonicate for 3 h to form a sol. Then add 5 g of β-cyclodextrin and stir to dissolve in the graphene oxide sol, then add 2 mL of 1mol L -1 The sodium bicarbonate solution was stirred evenly and ultrasonicated for 30 minutes to obtain a graphene oxide and β-cyclodextrin supramolecular sol system containing sodium bicarbonate.

[0048] (3) Preparation of three-dimensional graphene materials modified by nano-carbon dots: the supramolecular sol system containing sodium bicarbonate was frozen in the refrigerator for 24 h, and then dried in a freeze dryer for 72 h. Put the dried sample into the calcin...

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Abstract

The invention discloses a method for modifying a three-dimensional graphene material with carbon nano-dots. The method comprises the following steps: functionalizing graphene oxide with a macrocyclic compound, adding a carbonate solution to form a carbonate-containing macrocyclic compound and graphene oxide super-molecular sol system, carrying out freeze drying treatment, and carrying out multi-stage heating heat treatment to form a three-dimensional structure, wherein carbonate is adopted as a pore forming agent to prevent agglomeration of graphene. Formation of the super-molecular system prevents agglomeration of graphene oxide in the reduction process, the macrocyclic compound decomposes to anchor ordered carbon nano-dots to reduced graphene oxide nano-sheets in an in-situ manner in the calcining process, graphene sheets are separated by the carbon nano-dots, and graphene interlamellar spacing is increased; and a carbon nano-dot modified three-dimensional graphene material prepared through the method has a large specific surface, the three-dimensional structure is in favor of de-intercalating electrolyte ions in the graphene interlayer, and high specific capacitance can be obtained by using the carbon nano-dot modified three-dimensional graphene material in a super capacitor electrode material.

Description

technical field [0001] The invention relates to the technical fields of chemical power sources and nanometer materials, and more specifically, relates to a method for modifying three-dimensional graphene materials with nanometer carbon dots. Background technique [0002] Graphene is a new type of star material with a sheet-like structure composed of a single layer of carbon atoms. It consists of carbon atoms with sp 2 The hybrid orbitals form a hexagonal two-dimensional material with a honeycomb lattice. Graphene has important research significance in supercapacitors, lithium-ion batteries, and lead-carbon batteries because of its large specific surface area, high conductivity, and excellent electrical conductivity. Chemists can obtain graphene oxide by exfoliating graphite in the liquid phase, but due to the structural characteristics of graphene oxide itself (π-π stacking, hydrophobic-hydrophobic interaction), it is easy to form layers of solid-phase graphene during chemi...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/22C01P2004/04
Inventor 舒东黄毓岚宋晓娜钟杰赵仕绪孟涛
Owner SOUTH CHINA NORMAL UNIVERSITY
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