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Preparation method for manganese dioxide three-dimensional graphene composite material with controllable appearance

A technology of manganese dioxide and composite materials, which is applied in the direction of electrical components, electrolytic capacitors, capacitors, etc., can solve the problems of poor electrical conductivity, low specific surface area, and difficult to control the shape of manganese dioxide, and achieves low price and simple preparation process Effect

Inactive Publication Date: 2012-07-18
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, graphene-supported manganese dioxide is mainly based on graphene oxide, but graphene oxide has many defects, poor electrical conductivity, low specific surface area, etc., and the obtained composite electrode has low supercapacitance value; moreover, using graphene oxide The process of loading manganese dioxide is complicated, and the morphology of manganese dioxide is not easy to control, such as the preparation method of graphene oxide-loaded manganese dioxide disclosed in the invention patent CN101887806A

Method used

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  • Preparation method for manganese dioxide three-dimensional graphene composite material with controllable appearance
  • Preparation method for manganese dioxide three-dimensional graphene composite material with controllable appearance
  • Preparation method for manganese dioxide three-dimensional graphene composite material with controllable appearance

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Effect test

Embodiment 1

[0025] The three-dimensional graphene sheet synthesized by chemical vapor deposition was fixed on the glass sheet with 0.2mL of organic silica gel with a concentration of 48g / L;

[0026] Add 0.32g of potassium permanganate and 30ml of distilled water into a 0.05L reactor, stir with a glass rod for 3 minutes, put the three-dimensional graphene sheet fixed on the glass into the solution, and react at 150°C for 6 hours.

[0027] Rinse the reacted three-dimensional graphene with distilled water for 3 times, and then dry it in an oven at 80° C. for 4 hours to form a manganese dioxide three-dimensional graphene composite ( figure 1 ).

Embodiment 2

[0029] The three-dimensional graphene sheet synthesized by chemical vapor deposition was fixed on the glass sheet with 0.2mL of organic silica gel with a concentration of 48g / L;

[0030] Add 0.32g of potassium permanganate, 29ml of distilled water and 1ml of 1M hydrochloric acid aqueous solution into a 0.05L reaction kettle. After stirring with a glass rod for 5 minutes, put the three-dimensional graphene sheet fixed on the glass piece into the solution and heat it at 150°C. React for 6 hours.

[0031] Rinse the reacted three-dimensional graphene with distilled water for 3 times, and dry it in an oven at 80° C. for 4 hours to form a manganese dioxide three-dimensional graphene composite with an irregular flower-like surface ( figure 2 ).

Embodiment 3

[0033] The three-dimensional graphene sheet synthesized by chemical vapor deposition was fixed on the glass sheet with 0.2mL of organic silica gel with a concentration of 48g / L;

[0034] Add 0.32g of potassium permanganate, 27ml of distilled water and 3ml of 1M hydrochloric acid aqueous solution into a 0.05L reaction kettle. After stirring with a glass rod for 5 minutes, put the three-dimensional graphene sheet fixed on the glass piece into the solution and heat it at 150°C. React for 6 hours.

[0035] Rinse the reacted three-dimensional graphene with distilled water for 3 times, and dry it in an oven at 80° C. for 4 hours to form a rosette-shaped manganese dioxide three-dimensional graphene composite ( image 3 ).

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Abstract

The invention discloses a hydro-thermal synthesis preparation method for a manganese dioxide three-dimensional graphene composite material with controllable appearance and application of the preparation method in the field of supercapacitors. By adjusting solution acidity and reaction temperature in a synthesis process, surface appearance of manganese dioxide can be effectively controlled, and manganese dioxide / graphene composites of various appearance including planar meshes, irregular flower forms, nanotubes and nano particles. The composites can directly serve as electrochemical electrodes with ultra-high capacitance value.

Description

technical field [0001] The invention relates to a method for preparing a shape-controllable manganese dioxide / three-dimensional graphene composite material by hydrothermal synthesis and its application in the field of supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device with short charging time, excellent low temperature characteristics, long service life, energy saving and environmental protection. It is widely used in the energy storage of electromechanical equipment such as electric vehicles and armored vehicles. According to the different mechanism of storing electrical energy, supercapacitors can be divided into two types: electric double layer capacitors and Faraday capacitors. Manganese dioxide nanomaterials have the characteristics of high Faraday pseudocapacitance, high specific capacity, low price and environmental friendliness. They are electrode materials for Faraday type capacitors with great development potential....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 黄维董晓臣赵强刘淑娟
Owner NANJING UNIV OF POSTS & TELECOMM
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