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Preparation method of graphene/vanadium pentoxide composite material and application thereof

A technology of vanadium pentoxide and composite materials, which is applied in the field of electrochemical materials, can solve the problems of poor electrochemical properties and difficulties in the synthesis of composite electrodes, and achieve the effects of good electrochemical performance, good capacitance characteristics, and increased specific surface area

Inactive Publication Date: 2018-11-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the invention provides a kind of preparation method and application thereof of graphene / vanadium pentoxide composite material, for solving prior art, V 2 o 5 Difficult synthesis of composite electrodes and technical defects of poor electrochemical properties

Method used

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  • Preparation method of graphene/vanadium pentoxide composite material and application thereof
  • Preparation method of graphene/vanadium pentoxide composite material and application thereof
  • Preparation method of graphene/vanadium pentoxide composite material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment is a specific embodiment for preparing graphene / vanadium pentoxide composite material 1.

[0040] After ultrasonic dispersion of 20 mg graphene oxide, mix with 1 mL of 30% hydrogen peroxide, heat in a water bath at 96°C for 2 hours, cool to room temperature, add deionized water to the precipitate for dissolution and ultrasonic dispersion, porous graphene oxide 1.

[0041] 60mg of vanadium source 1 was dissolved in 10mg of the first solvent 1 and stirred for the first time, so that the vanadium source 1 was completely dissolved; then, mixed with 60mg of the second solvent 1 and stirred for the second time to obtain the first product 1; 1 is vanadium pentoxide, the first solvent 1 is hydrogen peroxide, and the second solvent 1 is polyvinyl alcohol. The time of the first stirring is 30min, the temperature of the first stirring is 50°C, the rotating speed of the first stirring is 40r / min; the time of the second stirring is 60min, the temperature of the secon...

Embodiment 2

[0046] This embodiment is a specific embodiment for preparing the graphene / vanadium pentoxide composite material 2.

[0047] After ultrasonic dispersion of 40 mg graphene oxide, mix with 1 mL of 30% hydrogen peroxide, heat in a water bath at 96°C for 2 hours, cool to room temperature, add deionized water to the precipitate for dissolution and ultrasonic dispersion, and obtain porous graphene oxide 2.

[0048] 60mg of vanadium source 2 was dissolved in 20mL of the first solvent 2 and stirred for the first time, so that the vanadium source 2 was completely dissolved; then, mixed with 5mL of the second solvent 2 and stirred for the second time to obtain the first product 2; 2 is ammonium metavanadate, the first solvent 2 is deionized water, and the second solvent 2 is ammonia water. The time of the first stirring is 30min, the temperature of the first stirring is 70°C, the rotating speed of the first stirring is 40r / min; the time of the second stirring is 60min, the temperature o...

Embodiment 3

[0053] This embodiment is a specific embodiment for preparing the graphene / vanadium pentoxide composite material 3.

[0054] After 40 mg of graphene oxide was ultrasonically dispersed, mixed with 1 mL of 30% hydrogen peroxide, heated in a water bath at 96°C for 2 hours, cooled to room temperature, and deionized water was added to the precipitate to dissolve and ultrasonically dispersed to obtain porous graphene oxide 3.

[0055] 60mg of vanadium source 3 was dissolved in 30mL of the first solvent 3 and stirred for the first time, so that the vanadium source 3 was completely dissolved; then, mixed with 60mg of the second solvent 3 and stirred for the second time to obtain the first product 3; 3 is sodium metavanadate, the first solvent 3 is deionized water, and the second solvent 3 is polyvinyl alcohol. The time of the first stirring is 30min, the temperature of the first stirring is 80°C, the rotating speed of the first stirring is 40r / min; the time of the second stirring is 6...

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Abstract

The invention belongs to the field of electrochemical materials, in particular to a preparation method of a graphene / vanadium pentoxide composite material and an application thereof. The invention provides a preparation method of a graphene / vanadium pentoxide composite material, comprising: mixing the vanadium source with porous graphene oxide and graphene oxide in sequence after being dissolved,and obtaining a graphene / vanadium pentoxide product sequentially through purification, drying and annealing after heating reaction. The invention also provides the application of the product obtainedby the above preparation method in a supercapacitor. The preparation method provided by the invention is simple and easy to operate, and provides more ion storage sites by adding porous graphene oxide to the composite material to increase the specific surface area. After the obtained product is made into an electrode material, the product is determined by electrochemical experiment to have good electrochemical performance and good capacitance characteristics. The invention solves the technical defects in the prior art that the synthesis of the V2O5 composite electrode is difficult and the electrochemical characteristics are poor.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, in particular to a preparation method and application of a graphene / vanadium pentoxide composite material. Background technique [0002] With the rapid development of industry and the rapid increase of population, the consumption of global energy is accelerating at an alarming rate. Energy shortage and environmental pollution have become two major challenges facing human development. Therefore, it is necessary to vigorously develop low-cost, sustainable and environmentally friendly new energy conversion and storage devices to meet the development needs of modern society and alleviate increasingly prominent environmental problems. [0003] Among various energy storage systems, the most important ones are electrochemical energy storage systems, including lithium-ion batteries, supercapacitors and fuel cells. In recent years, with the rapid development of new technologies in the fields of i...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 刘章明张海燕郑程
Owner GUANGDONG UNIV OF TECH