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Preparation method of supramolecular graphene-supported ferric oxide self-assembly

A technology of ferroferric oxide and graphene, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of specific surface reduction, low conductivity, poor stability, etc., to increase specific capacitance, improve Capacitive properties, the effect of solving agglomeration

Active Publication Date: 2017-05-03
YANGZHOU UNIV
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Problems solved by technology

[0005] In order to solve Fe 3 o 4 Due to the low conductivity and poor stability of graphene and Fe 3 o 4 Combined to prepare composite materials, by combining Fe 3 o 4 Redox reaction with graphene's high specific surface area and high conductivity to improve electrochemical performance
[0006] However, the severe aggregation of graphene leads to a sharp decrease in its specific surface area, which limits its application in supercapacitors.

Method used

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  • Preparation method of supramolecular graphene-supported ferric oxide self-assembly
  • Preparation method of supramolecular graphene-supported ferric oxide self-assembly

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Experimental program
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Embodiment Construction

[0024] 1. Preparation of graphene three-dimensional self-assembly

[0025] 1. Preparation of water-soluble β-polycyclodextrin:

[0026] Add 20g of β-cyclodextrin (β-CD) into 30wt% NaOH aqueous solution and stir at room temperature until β-CD dissolves to obtain a mixture. After the mixture was placed in a 30°C water bath for 5 hours, 9.64 mL of epichlorohydrin was added to the mixture, stirred for 24 h, and cooled to room temperature. After the salt is removed by dialysis, the solution is evaporated to dryness to obtain a white solid, which is dried in vacuum for 24 hours (vacuum degree is 1200-4800Pa, drying temperature is 50-70℃), and water-soluble β-CD polymer (β-polymer cyclodextrins).

[0027] 2. Preparation of graphene-supported ferric oxide (rGO@Fe 3 o 4 ):

[0028] Disperse 10mg of graphite oxide powder into 10mL of ethylene glycol, and obtain a homogeneous solution by ultrasonication, then add 0.1g of polyvinylpyrrolidone, 0.2g of sodium acetate, and 0.108g of hi...

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Abstract

The preparation method of supramolecular graphene-loaded ferric oxide self-assembly belongs to the technical field of supramolecular chemistry. The invention combines Fe3O4 oxidation-reduction reaction to modify Fe3O4 to the surface of graphene to further improve the capacitive properties. The invention uses polyethylene glycol diadamantane as a bridging agent, and then passes the supramolecular force between cyclodextrin and adamantane molecules. The prepared graphene@ferroferric oxide three-dimensional self-assembled body not only solves the reduction of specific capacitance caused by the agglomeration of graphene itself, but also greatly increases its specific capacitance, up to 392.9F / g, which shows that graphene@four The triiron oxide assembly has great application prospects in supercapacitors.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials, in particular to the technical field of supramolecular chemistry, and in particular to the technical field of supercapacitor material preparation. Background technique [0002] Electrochemical capacitors (or known as supercapacitors) have attracted increasing attention in energy storage, mainly due to their high energy density and high specific capacitance, as well as good cycle life. Therefore, the electrochemical capacitor will effectively assist and even possibly replace batteries in many applications, such as in hybrid vehicles. [0003] So far, there are mainly carbon materials, transition metal oxides and conductive polymers. These three materials can generally be used as electrode materials for supercapacitors. Carbon materials are mainly used for electric double layer capacitors. The energy storage process of this material charge is very Faraday process, energy stora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36H01G11/46
CPCY02E60/13
Inventor 刁国旺蔡寅倪鲁彬张旺陈铭
Owner YANGZHOU UNIV