Cobaltosic oxide nanowire/reduction-oxidization graphene hydrogel composite material and preparation method and application therefor

A technology of cobalt trioxide nanometer and graphene hydrogel, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., and can solve the problems of low specific capacitance, unrevealed excellent performance, easy agglomeration and stacking of graphene, etc. question

Inactive Publication Date: 2016-07-20
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, due to the van der Waals force, graphene is very easy to agglomerate and stack, making its excellent performance difficult to show, and the actual specific capacitance value is not high.

Method used

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  • Cobaltosic oxide nanowire/reduction-oxidization graphene hydrogel composite material and preparation method and application therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation of cobalt trioxide nanowires / reduced graphene oxide hydrogel composites

[0050] (1) Preparation of graphite oxide: GO was prepared by the Hummers method using natural graphite as raw material. The specific process is: 4g of graphite powder is added to 96mL of concentrated sulfuric acid, and the resulting mixture is stirred in an ice-water bath for 30 minutes, and then 13g of KMnO is gradually added to the reaction system. 4 and 2gNaNO 3 , while maintaining the process temperature below 20°C, the ice bath was removed after 30min, and the mixture was stirred for 3h at room temperature. As the reaction progressed, the mixture gradually became viscous and the color gradually changed to brown. Subsequently, 140 mL of distilled water was added and the temperature was kept not higher than 98° C., at which time the color of the mixture turned brown, and the reaction continued for 25 min. With the addition of 140 mL of distilled water and 10 mL of 30% hydrogen...

Embodiment 2

[0059] 1. Preparation of cobalt trioxide nanowires / reduced graphene oxide hydrogel composites

[0060] (1) Preparation of graphite oxide: same as Example 1;

[0061] (2) Preparation of graphene oxide dispersion: same as Example 1;

[0062] (3) Preparation and stripping of cobalt hydroxide: 0.0686g of p-aminobenzoic acid (PABA) was dissolved in distilled water to form an aqueous solution; then 0.0389g of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ?6H 2 O), stirred to fully dissolve to obtain a mixed solution; adjust the pH to 9~10 with ammonia water, stir for 30min, and let stand for 12h; remove the supernatant, filter the precipitate, and wash with absolute ethanol and distilled water until Neutral, formed cobalt hydroxide intercalated with p-aminobenzoic acid, and then ultrasonically stripped it in water (ultrasonic electric power is 250W, ultrasonic time is 15min), to obtain positively charged cobalt hydroxide nanoparticle dispersion;

[0063](4) Preparation of the composit...

Embodiment 3

[0068] 1. Preparation of cobalt trioxide nanowires / reduced graphene oxide hydrogel composites

[0069] (1) Preparation of graphite oxide: with embodiment one;

[0070] (2) Preparation of graphene oxide dispersion: same as Example 1;

[0071] (3) Preparation and stripping of cobalt hydroxide: 0.0686g of p-aminobenzoic acid (PABA) was dissolved in distilled water to form an aqueous solution. Then add 0.0824g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ?6H 2 O), stir to fully dissolve to obtain a mixed solution; adjust the pH value to 9~10 with a certain amount of ammonia water, and stir for 30 minutes. After standing for 12 hours, remove the supernatant, filter the precipitate with suction, wash with absolute ethanol and distilled water until neutral, and form cobalt hydroxide intercalated with p-aminobenzoic acid, and then perform ultrasonic stripping in water (The ultrasonic electric power is 250W, and the ultrasonic time is 15min), and positively charged cobalt hydroxide nan...

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Abstract

The invention provides a cobaltosic oxide nanowire / reduction-oxidization graphene hydrogel (Co<3>O<4> / rGH) composite electrode material which can be applied to a supercapacitor, and belongs to the technical field of a composite electrode material. The laminated framework of the reduction-oxidization graphene hydrogel is taken as the conductive substrate; the cobaltosic oxide nanowire is grown on the surface of the graphene nano sheet through a hydrothermal reaction so as to enable the cobaltosic oxide nanowire and the reduction-oxidization graphene hydrogel laminated structure to establish the composite material, wherein the composite material is formed by wires / sheets and has a multi-stage micropore structure, so that the electrochemical performance is improved consequently; meanwhile, the composite material has relatively high specific capacity and cycling stability; in addition, the composite material has the characteristics of low-price and easily-available raw materials, low pollution, and the like, simple preparation process, stable technology, and easy operation; and meanwhile, the composite material can satisfy the basic commercial requirements when the composite material is used as the electrode material of the supercapacitor.

Description

technical field [0001] The invention relates to a cobalt trioxide nanowire / reduced graphene oxide hydrogel composite material and a preparation method thereof; the invention also relates to the application of the composite material as a supercapacitor electrode material, belonging to the technical field of composite materials and electrode materials. technical background [0002] With the development and utilization of clean energy, energy storage is particularly important, and the development of a new type of energy storage device has become an inevitable trend. 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 due to its short charge and discharge time and long cycle life. Electrode materials are the core of the development of supercapacitor technology, among which carbon materials have the advantages of cheap and easy to obtain, abundant sources, h...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/44H01G11/30H01G11/36H01G11/46H01G11/86
CPCY02E60/13H01G11/24H01G11/30H01G11/36H01G11/44H01G11/46H01G11/86
Inventor 梁雅荣胡中爱杨玉英张雅迪李志敏安宁吴红英
Owner NORTHWEST NORMAL UNIVERSITY
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