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A kind of preparation method of tricobalt tetroxide/graphene nanocomposite supercapacitor electrode material

A technology of tricobalt tetroxide and supercapacitor, which is applied in the direction of hybrid capacitor electrode, hybrid/electric double layer capacitor manufacturing, etc., to achieve the effects of reducing current impedance, strong stability, and increasing specific surface area

Inactive Publication Date: 2018-01-12
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, amorphous porous Co was first synthesized 3 o 4 nanosheets, and the preparation of composites of graphene and cobalt tetroxide by hydrothermal reduction has not been reported yet

Method used

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  • A kind of preparation method of tricobalt tetroxide/graphene nanocomposite supercapacitor electrode material
  • A kind of preparation method of tricobalt tetroxide/graphene nanocomposite supercapacitor electrode material
  • A kind of preparation method of tricobalt tetroxide/graphene nanocomposite supercapacitor electrode material

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Embodiment 1

[0036] A preparation method of tricobalt tetroxide / graphene nanocomposite supercapacitor electrode material, comprising the following steps:

[0037] (1) Weigh 0.58g of cobalt nitrate hexahydrate, put it into 24mL deionized water, and keep stirring until it is completely dissolved;

[0038] (2) Weigh 8 mL of ethanolamine and add it to the solution in step (1), and stir for 1 h;

[0039] (3) The solution obtained in step (2) was poured into a reaction kettle lined with polytetrafluoroethylene, and hydrothermally reacted at 200° C. for 24 hours.

[0040] (4) Naturally cool to room temperature after the reaction, collect the solid matter in the reaction kettle, wash with deionized water and ethanol respectively, and then put it into an oven to dry at 60°C for 12 hours;

[0041] (5) Grinding the dried obtained solid matter and putting it into a tube furnace for high-temperature reaction, then cooling naturally to obtain amorphous porous cobalt tetraoxide nanosheets; wherein, the ...

Embodiment 2

[0049] A preparation method of tricobalt tetroxide / graphene nanocomposite supercapacitor electrode material, comprising the following steps:

[0050] (1) Weigh 0.58g of cobalt nitrate hexahydrate, put it into 24mL deionized water, and keep stirring until it is completely dissolved;

[0051] (2) Weigh 8 mL of ethanolamine and add it to the solution in step (1), and stir for 1 h;

[0052] (3) Pour the solution obtained in step (2) into a reaction kettle lined with polytetrafluoroethylene, and conduct a hydrothermal reaction at 180° C. for 26 hours.

[0053] (4) Naturally cool to room temperature after the reaction, collect the solid matter in the reaction kettle, wash with deionized water and ethanol respectively, and then put it in an oven for 11 hours at 55° C.;

[0054] (5) Grinding the dried obtained solid matter and putting it into a tube furnace for high-temperature reaction, then cooling naturally to obtain amorphous porous cobalt tetraoxide nanosheets; wherein, the high...

Embodiment 3

[0060] A preparation method of tricobalt tetroxide / graphene nanocomposite supercapacitor electrode material, comprising the following steps:

[0061] (1) Weigh 0.58g of cobalt nitrate hexahydrate, put it into 24mL deionized water, and keep stirring until it is completely dissolved;

[0062] (2) Weigh 8 mL of ethanolamine and add it to the solution in step (1), and stir for 1 h;

[0063] (3) Pour the solution obtained in step (2) into a reaction kettle lined with polytetrafluoroethylene, and conduct a hydrothermal reaction at 220° C. for 226 hours.

[0064] (4) Naturally cool to room temperature after the reaction, collect the solid matter in the reaction kettle, wash with deionized water and ethanol respectively, and then put it into an oven to dry at 65° C. for 13 hours;

[0065] (5) Grinding the dried solid matter and putting it into a tube furnace for high-temperature reaction, then cooling naturally to obtain amorphous porous cobalt tetraoxide nanosheets; wherein, the hig...

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Abstract

The present invention relates to a method for preparing an electrode material of cobalt trioxide / graphene nanocomposite supercapacitor: adding cobalt nitrate hexahydrate into deionized water, stirring until it is completely dissolved; adding ethanolamine to the above solution, stirring to fully mix; The resulting solution was subjected to a hydrothermal reaction and then naturally cooled to room temperature, the solid matter was collected, washed with deionized water and ethanol respectively, and then dried in an oven; after grinding, a high-temperature reaction was performed, and then naturally cooled to obtain an amorphous porous cobalt trioxide nanometer sheet; adding the amorphous porous cobalt trioxide nanosheet into the graphene oxide aqueous solution, ultrasonic stirring treatment, to obtain a mixed solution; hydrothermal reduction treatment; centrifugation, and freeze-drying, and collecting the obtained product. In the present invention, the tricobalt tetroxide is evenly distributed on the graphene nanosheets in the form of amorphous porous nanosheets, which increases the specific surface area, improves the specific capacitance, reduces the current impedance, and strengthens the cycle stability.

Description

technical field [0001] The invention relates to the field of supercapacitor electrode materials, in particular to a preparation method of tricobalt tetroxide / graphene nanocomposite supercapacitor electrode materials. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between traditional capacitors and batteries, with excellent pulse charge-discharge performance and large-capacity energy storage performance. Such as high power density, long cycle life, fast charging speed, capable of instantaneous high current discharge, green and pollution-free, it is a new type of energy storage device developed in recent years. Nowadays, all countries in the world are paying close attention to the development of supercapacitors, and invest a lot of manpower and material resources in their research and development. [0003] Cobalt tetroxide is a typical metal oxide, which has potential application value in lithiu...

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 李广杜沣左学勤杨群金绍维
Owner ANHUI UNIVERSITY