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Preparation method of Co3O4/nitrogen doped graphene composite electrode material

A nitrogen-doped graphene and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of poor cycle stability, limited application, low rate performance, etc., and achieve good capacitance performance, The method is simple and environmentally friendly, and the effect of low cost

Inactive Publication Date: 2016-04-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] co 3 o 4 It has excellent oxidation-reduction properties and high theoretical capacitance (3560F·g -1 ), but poor cycle stability and low rate performance limit its application in supercapacitors

Method used

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  • Preparation method of Co3O4/nitrogen doped graphene composite electrode material
  • Preparation method of Co3O4/nitrogen doped graphene composite electrode material
  • Preparation method of Co3O4/nitrogen doped graphene composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0033] Weigh 50mg of graphene oxide, place it in 60mL of acetonitrile and ultrasonically disperse it for 30min to obtain a uniform acetonitrile solution of graphene oxide, transfer the solution to a hydrothermal kettle, and react at 180°C for 12h. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for five times, and then dried in a vacuum oven at 60°C for 12 hours to obtain nitrogen-doped graphite. Alkene, the XRD of the product is as figure 1 As shown in the curve a in the figure 2 It is a transmission electron microscope image of nitrogen-doped graphene, and the sheet-like nitrogen-doped graphene can be clearly observed. The product is analyzed by X-ray photoelectron spectroscopy (XPS), and the nitrogen exists in the form of carbon-nitrogen bond, pyridine nitrogen, and pyrrole nitrogen.

Embodiment 2

[0035] Weigh 50 mg of graphene oxide, place it in 60 mL of acetonitrile for ultrasonic dispersion for 30 min to obtain a uniform acetonitrile solution of graphene oxide, transfer the solution to a hydrothermal kettle, and react at 190 ° C for 12 h. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for five times, and then dried in a vacuum oven at 60°C for 12 hours to obtain nitrogen-doped graphite. alkene. The product is analyzed by X-ray photoelectron spectroscopy (XPS), and the nitrogen exists in the form of carbon-nitrogen bond, pyridine nitrogen, and pyrrole nitrogen.

Embodiment 3

[0037] Weigh 50 mg of graphene oxide, place it in 60 mL of acetonitrile for ultrasonic dispersion for 30 min to obtain a uniform acetonitrile solution of graphene oxide, transfer the solution to a hydrothermal kettle, and react at 200 ° C for 12 h. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for five times, and then dried in a vacuum oven at 60°C for 12 hours to obtain nitrogen-doped graphite. alkene. The product is analyzed by X-ray photoelectron spectroscopy (XPS), and the nitrogen exists in the form of carbon-nitrogen bond, pyridine nitrogen, and pyrrole nitrogen.

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Abstract

The invention provides a preparation method of Co3O4 / nitrogen doped graphene composite electrode material. The preparation method comprises the following steps that step 1. nitrogen doped graphene is prepared; step 2. a soluble alkaline solution is prepared; step 3. polyacrylamide (PAM), heptahydrated cobalt sulfate and nitrogen doped graphene prepared in the step 1 are ultrasonic-dispersed in deionized water so that mixed liquid A is obtained; step 4. the soluble alkaline solution prepared in the step 2 is dropped in the mixed liquid A to react, and pH=8.5-10 is obtained through adjustment so that mixed liquid B is obtained; and step 5. the mixed liquid B is transferred to a microwave reactor to perform heating reaction, and suction filtration, washing and drying are performed on the product after the end of reactor so that the Co3O4 / nitrogen doped graphene composite electrode material is obtained finally. The prepared composite material is stable in structure, and the method has advantages that the method is simple and environment-friendly, the reaction conditions are moderate, reaction is easy to control, cost is low and the technology and the process are simple and convenient.

Description

technical field [0001] The invention relates to a method for preparing an electrode material for an ultrafine cobalt tetraoxide nanocrystal supercapacitor embedded in nitrogen-doped graphene, specifically a Co 3 O 4 / The preparation method of nitrogen-doped graphene composite electrode material. Background technique [0002] With its unique two-dimensional hexagonal network structure, graphene exhibits excellent properties such as large specific surface area, good electron mobility, and high stability. Therefore, it has excellent application potential as a matrix material in the field of supercapacitors. However, the literature shows that the actual capacity of graphene is smaller than the theoretical capacity and decays faster, which requires nitrogen doping to adjust the electronic structure of graphene. The introduction of N, B and other heteroatoms between graphene sheets can effectively transform graphene from a zero-band gap semi-metal into a semiconductor, forming ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46H01G11/36H01G11/24
CPCY02E60/13H01G11/86H01G11/24H01G11/36H01G11/46
Inventor 章明美李远王谊谢吉民闫早学潘登辉郑杰
Owner JIANGSU UNIV
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