Method for preparing manganese dioxide/graphene/porous carbon (MnO2/rGO/C) composite material and application of MnO2/rGO/C composite material to supercapacitor as electrode material

A supercapacitor, manganese dioxide technology, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, double-layer capacitors, etc., can solve the problem of low specific capacitance and easy agglomeration

Inactive Publication Date: 2015-02-18
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the actual specific capacitance is not high due to the effect of van der Waals force, which makes it easy to reunite or re-stack.

Method used

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  • Method for preparing manganese dioxide/graphene/porous carbon (MnO2/rGO/C) composite material and application of MnO2/rGO/C composite material to supercapacitor as electrode material
  • Method for preparing manganese dioxide/graphene/porous carbon (MnO2/rGO/C) composite material and application of MnO2/rGO/C composite material to supercapacitor as electrode material
  • Method for preparing manganese dioxide/graphene/porous carbon (MnO2/rGO/C) composite material and application of MnO2/rGO/C composite material to supercapacitor as electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Flake hexagonal manganese dioxide / graphene / porous carbon (MnO 2 / rGO / C) composites

[0056] Preparation of graphite oxide dispersion: Weigh 100 mg of graphite oxide and ultrasonically disperse it in 100 ml of distilled water to form a graphite oxide dispersion;

[0057] Preparation of flaky hexagonal manganese dioxide: Dissolve 1.264g of potassium manganate in 100ml of distilled water to form potassium permanganate aqueous solution; then disperse 1g of potato starch in 100ml of potassium permanganate aqueous solution, and stir magnetically for 5h. A mixed solution is obtained. Then use KOH solution to adjust the pH value of the mixed solution to 9~10, move it to a high-pressure reactor, and heat it in water at 180°C for 24 hours; after cooling to room temperature, filter it with suction, and wash it repeatedly with absolute ethanol and distilled water until neutral. Vacuum drying at 60°C for 12 hours to obtain flaky hexagonal manganese dioxide;

[0058] Flake hex...

Embodiment 2

[0064] (1) Flake hexagonal manganese dioxide / graphene / porous carbon (MnO 2 / rGO / C) composites

[0065] Preparation of graphite oxide dispersion: Weigh 100g of graphite oxide and ultrasonically disperse it in 80ml of distilled water to form a graphite oxide dispersion;

[0066] Preparation of flaky hexagonal manganese dioxide: Dissolve 1.3g of potassium manganate in 100ml of distilled water to form potassium permanganate aqueous solution; then disperse 0.8g of potato starch in 100ml of potassium permanganate aqueous solution, and magnetically stir for 5 hours , to obtain a mixed solution. Then use KOH solution to adjust the pH value of the mixed solution to 9~10, move it to a high-pressure reactor, and heat it in water at 180°C for 24 hours; after cooling to room temperature, filter it with suction, and wash it repeatedly with absolute ethanol and distilled water until neutral. Vacuum drying at 60°C for 12 hours to obtain flaky hexagonal manganese dioxide;

[0067] Flake hex...

Embodiment 3

[0073] (1) Flake hexagonal manganese dioxide / graphene / porous carbon (MnO 2 / rGO / C) composites

[0074] Preparation of graphite oxide dispersion: Weigh 100g of graphite oxide and ultrasonically disperse it in 120ml of distilled water to form a graphite oxide dispersion;

[0075] Preparation of flaky hexagonal manganese dioxide: Dissolve 1.1g of potassium manganate in 100ml of distilled water to form potassium permanganate aqueous solution; then disperse 0.7g of potato starch in 100ml of potassium permanganate aqueous solution and stir magnetically for 5 hours , to obtain a mixed solution. Then use KOH solution to adjust the pH value of the mixed solution to 9~10, move it to a high-pressure reactor, and heat it in water at 180°C for 24 hours; after cooling to room temperature, filter it with suction, and wash it repeatedly with absolute ethanol and distilled water until neutral. Vacuum drying at 60°C for 12 hours to obtain flaky hexagonal manganese dioxide;

[0076] Flake hex...

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Abstract

The invention provides a hexagonal flake manganese dioxide / graphene / porous carbon (MnO2 / rGO / C) composite material used in electrodes of a supercapacitor, and belongs to the technical field of composite materials. Graphite oxide, potato starch and potassium permanganate are used as raw materials, and the MnO2 / rGO / C composite material is obtained through a hydrothermal reaction. Electrochemical property tests show that the prepared MnO2 / rGO / C composite material not only has a synergistic effect of two properties but also has an excellent property which cannot be achieved by a single electrode, high electrochemical capacitance behaviors are revealed, the good doubled dissolution rate and the good cycling stability are achieved, and therefore the MnO2 / rGO / C composite material can be used as an electrode material of the supercapacitor. In addition, the raw material has the advantages of being low in price, easy to obtain, low in weight, recyclable, free of pollution and the like. The preparing process is simple, the technology is stable, operation is easy, quality is reliable, and the MnO2 / rGO / C composite material can meet the basic commercialized requirements when being used as the electrode material of the supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a sheet-like hexagonal manganese dioxide / graphene / porous carbon (MnO 2 / rGO / C) preparation of composite material; The present invention also relates to this MnO 2 Application of / rGO / C composites as electrode materials in supercapacitors. technical background [0002] With the development and utilization of clean energy, energy storage is particularly important, and it is imminent to develop a new type of energy storage device. Supercapacitor is a new type of energy storage / conversion device, which is widely used in portable electronic products, hybrid electric vehicles and large industrial equipment etc. The selection of electrode materials is the main reason affecting supercapacitors, mainly including metal oxides, conductive polymers and carbon-based materials. [0003] MnO 2 Due to its abundance, cheapness, environmental friendliness, lively redox activity, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/46H01G11/32H01G11/86
CPCH01G11/00H01G11/32H01G11/34H01G11/46H01G11/86Y02E60/13
Inventor 胡中爱强睿斌吴红英张子瑜李志敏安宁杨玉英
Owner NORTHWEST NORMAL UNIVERSITY
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