Method for preparing supra-molecular graphene load manganese dioxide self-assembly

A technology of manganese dioxide and graphene, which is applied in the field of preparation and supramolecular chemistry, can solve the problems of limiting the application of electrochemical performance and low conductivity, and achieve the effect of improving electrochemical performance and high specific capacitance

Active Publication Date: 2015-10-21
YANGZHOU UNIV
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Problems solved by technology

However, the low conductivity of manganese dioxide limits its electrochemical...

Method used

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  • Method for preparing supra-molecular graphene load manganese dioxide self-assembly
  • Method for preparing supra-molecular graphene load manganese dioxide self-assembly

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Embodiment Construction

[0025] 1. Preparation of three-dimensional self-assembled graphene manganese dioxide

[0026] 1. Preparation of graphene-supported manganese dioxide (rGOMnO 2 ):

[0027] Disperse 10mg of reduced graphene into 20mL of deionized water, ultrasonically obtain a homogeneous solution, then add 0.23g of manganese sulfate monohydrate, ice-bathed aqueous solution, and slowly add 20mL of 0.1M potassium permanganate aqueous solution to the solution until The reaction turns into a brown color, and the product is collected by centrifugation, then washed three times with ethanol, then washed three times with deionized water, and finally dried in an oven at 60°C for 12 hours to obtain rGO MnO 2 .

[0028] 2. Preparation of water-soluble β-polycyclodextrin:

[0029] Add 20 g β-CD into 32mL 30wt% NaOH aqueous solution, stir at room temperature until β-CD dissolves. After 5 hours in a water bath at 30 °C, 9.64 mL of epichlorohydrin was added to the mixture, stirred for 24 h, and cooled to ...

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Abstract

A method for preparing a supra-molecular graphene load manganese dioxide self-assembly relates to the technical field of supra-molecular chemistry. According to the invention, the electrochemical performance of a graphene-based super capacitor is improved by combining the properties of a manganese dioxide Faraday capacitor and high specific surface area and high conductivity of graphene. Graphene-manganese dioxide compound is simply and rapidly prepared through supra-molecular interaction; then, graphene is assembled through supra-molecular interaction; and finally, a three-dimensional self-assembly of graphene sandwich manganese dioxide nanoparticles is obtained. Experiments show that the self-assembly of graphene load manganese dioxide has higher specific capacitance than that of pure manganese dioxide, and the specific capacitance can be up to 867.8 Fg<-1>.

Description

technical field [0001] The invention relates to the technical field of preparation of supercapacitor materials and nanocomposite materials, in particular to the technical field of supramolecular chemistry. Background technique [0002] Energy storage devices in mobile electronic devices, hybrid vehicles, industrial equipment, memory backup systems, and military equipment all suffer from the same problem, low energy density and short cycle life. To overcome this problem, much work has been done to develop new electrochemical capacitors such as supercapacitors for energy storage in the above devices. Compared with secondary batteries, electrochemical capacitors have faster and higher power capacity, longer life, wide thermal operating range, and lower maintenance costs. [0003] Due to its low price, high energy density, low environmental pollution, and abundant resources, manganese dioxide is widely used in electrode materials of capacitors to develop high-performance superc...

Claims

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Application Information

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IPC IPC(8): H01G11/86
CPCY02E60/13H01G11/86
Inventor 刁国旺蔡寅倪鲁彬张旺陈铭
Owner YANGZHOU UNIV
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