Graphene cage with hierarchy structure and preparation method thereof

A graphene cage and graphene layer technology, applied in the field of hierarchical structure graphene cage and its preparation, can solve the problems of unsatisfactory electrical conductivity of materials, low degree of graphitization, no literature reports and the like, and achieve high crystallinity , easy to operate, beneficial to the effect of large-scale production

Inactive Publication Date: 2014-11-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific capacitance is not high for carbon materials, especially graphene materials, because the carbon crystallinity in the carbon nanocage is low, the degree of graphitization is not high, and the electrical conductivity of the material is not ideal.
[0005] Connecting independent graphene cages to form a secondary structure graphene cage, using its interconnected graphene layers and internal conduction cavities, will be more conducive to the transfer of electrons and ion transmission, in lithium-ion batteries, supercapacitors , electrochemical catalysis and electrochemical sensors and other fields have application value, but this structure has not been reported in the literature

Method used

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  • Graphene cage with hierarchy structure and preparation method thereof
  • Graphene cage with hierarchy structure and preparation method thereof
  • Graphene cage with hierarchy structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: 0.9 g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 0.24 g of sodium hydroxide (NaOH) were put into a beaker, 36.4 mL of ethylenediamine and 18.2 mL of deionized water were added, and ultrasonically dispersed in an ultrasonic cleaner to generate a white suspension; then transferred to a volume of 100 mL Teflon-lined autoclave, put in an oven at 200 o C was heated at a constant temperature for 8 hours; the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged 3 times, and o C was dried for 8 hours to obtain the secondary structure ZnO.

[0025] Place 0.1 g of ZnO with secondary structure in the high temperature zone of the dual temperature zone tube furnace, and place 0.1 g of solid camphor in the low temperature zone of the dual temperature zone tube furnace; o The rate of C / min raises the temperature of the high temperature zone to 700 o C, then with 5 o The ra...

Embodiment 2

[0029] Embodiment 2: 0.48 g zinc sulfate (Zn(SO 4 ) 2 ) and 0.48 g sodium hydroxide (NaOH) into a beaker, add 38.5 mL ethylenediamine and 12.8 mL deionized water, and ultrasonically disperse it in an ultrasonic cleaner to form a white suspension; then transfer to a volume of 100 mL of PTFE-lined autoclave, put in an oven at 180 o C was heated at a constant temperature for 6 hours; the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged 5 times, and o C was dried for 10 hours to obtain the secondary structure ZnO.

[0030] Place 0.1 g of secondary structure ZnO in the high temperature zone of a dual temperature zone tube furnace, and place 0.05 g of solid camphor in the low temperature zone of a dual temperature zone tube furnace; o C / min rate to raise the temperature of the high temperature zone to 900 o C, then with 5 o The rate of C / min raises the temperature of the low te...

Embodiment 3

[0033] Embodiment 3: 0.41 g zinc chloride (ZnCl 2 ) and 0.72 g sodium hydroxide (NaOH) into a beaker, add 40.5 mL ethylenediamine and 10.2 mL deionized water, and ultrasonically disperse it in an ultrasonic cleaner to form a white suspension; then transfer to a volume of 100 mL of PTFE-lined autoclave, put in an oven for 150 o C was heated at a constant temperature for 12 hours; the autoclave was taken out and cooled to room temperature naturally to obtain a white precipitate, which was washed with absolute ethanol and centrifuged 4 times, and o C was dried for 12 hours to obtain the secondary structure ZnO.

[0034] Place 0.1 g of secondary structure ZnO in the high-temperature zone of a dual-temperature-zone tube furnace, and place 0.2 g of solid camphor in the low-temperature zone of a dual-temperature zone tube furnace; o C / min rate to raise the temperature of the high temperature zone to 800 o C, then with 5 o The rate of C / min raises the temperature of the low temper...

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Abstract

The invention provides a graphene cage with a hierarchy structure and a preparation method thereof, belonging to the technical field of carbon nanomaterials and preparation thereof. The graphene cage with the hierarchy structure is composed of a plurality of capsular graphene cages mutually connected in an end-to-end manner in three-dimensional space. The graphene cage with the hierarchy structure has mutually connected graphene layers and an internally conductive cavity, is beneficial for electron transfer and ion transport, presents the advantages of high specific capacity, good rate capability, good cycle stability and the like when used as a negative electrode material for a lithium ion battery and shows latent application values in fields like supercapacitors, electrochemical catalysis and electrochemical sensors. The invention further provides the preparation method for the graphene cage with the hierarchy structure. The method comprises the following steps: with ZnO with a hierarchy structure as a template and camphor as a carbon source, depositing graphene layers on the surface of the ZnO template in an inert atmosphere by using chemical vapor deposition; and carrying out dissolving with an acid to remove the ZnO template so as to obtain the graphene cage with the hierarchy structure. The preparation method can effectively control the size of the graphene cage with the hierarchy structure and the number of the graphene layers, is simple and is convenient to operate and beneficial for scale production.

Description

technical field [0001] The invention relates to a graphene cage with a hierarchical structure and a preparation method thereof, belonging to the technical field of carbon nanomaterials and preparation thereof. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial whose carbon atoms are arranged in the same arrangement as the monoatomic layer of graphite. Generally, a two-dimensional carbon layer structure with carbon atomic layers stacked less than 10 layers is called graphene. The unique physical and chemical properties of graphene have aroused widespread interest among researchers. However, graphene sheets are easy to stack each other, which affects its performance. Therefore, it is of great significance to study graphene materials with special morphology to solve the stacking problem of graphene sheets and improve its performance. Graphene cages are a new type of graphene material that is curled around graphene sheets and has internal cavities t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B31/02
CPCB82Y30/00B82Y40/00C01B32/186C01B2204/32H01M4/587H01M10/0525Y02E60/10
Inventor 杨文胜毛冲
Owner BEIJING UNIV OF CHEM TECH
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