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Production method and application of cobaltous oxide/carbon nanostructure array

A technology of carbon nanostructure and cobalt monoxide, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effects of low reaction temperature, high power density and energy density, and simple preparation process

Inactive Publication Date: 2014-03-12
HUAZHONG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant report on the preparation of cobalt monoxide / carbon nanostructure array materials by chemical vapor deposition. Therefore, this method has high practical application value for the research of cobalt monoxide electrochemical properties and carbon coating.

Method used

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  • Production method and application of cobaltous oxide/carbon nanostructure array
  • Production method and application of cobaltous oxide/carbon nanostructure array
  • Production method and application of cobaltous oxide/carbon nanostructure array

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method of cobalt monoxide / carbon nanostructure array, the steps are as follows:

[0034] 1. Prepare 50mL of a mixed aqueous solution containing 0.05M cobalt nitrate hexahydrate and 0.23M urea, stir at room temperature for more than 10 minutes to obtain a uniform red solution, and then transfer the solution to the liner of a stainless steel reactor lined with polytetrafluoroethylene. At the same time, immerse the cleaned nickel mesh (20×50×1.1mm 3 ,110PPI,353g / m 2 , Shenzhen Kejing) substrate, sealed, reacted at 95 ° C for 8 hours, the volume ratio of the aqueous solution to the reactor was 50:90. After the reaction, take out the base of the nickel mesh and rinse it several times with water to clean the residual reaction substances attached to the surface. At this time, the color of the nickel mesh changes from silvery white to purple red due to the growth of the cobalt monoxide precursor. Dry the cleaned nickel mesh with the precursor at 60°C and put it ...

Embodiment 2

[0039] A preparation method of cobalt monoxide / carbon nanostructure array:

[0040] According to the conditions of step 1 of Example 1, after annealing at 427°C for 3 hours, acetylene gas was introduced, the flow rate was controlled at 6 sccm, and the ventilation time was 150 seconds, and then the annealing was continued for 0.5 hours, the temperature was kept at 427°C, and then cooled naturally , take out the nickel mesh, and the nitrogen flow rate remains constant at 80 sccm throughout the process. The cobalt monoxide / carbon nanowire array can be obtained, and its topography is shown in Fig. 2(b).

[0041] Analytical tests show that when the ventilation time is increased to 150s, a layer of carbon layer grows on the surface of cobalt oxide, as shown by the transmission electron microscope ( Figure 4 ) It can be seen that there is a layer of carbon layer with good crystallinity on the surface of cobalt oxide, whose lattice constant coincides with the (002) plane of graphite...

Embodiment 3

[0043] A preparation method of cobalt monoxide / carbon nanostructure array:

[0044] According to the conditions of Step 1 of Example 1, the concentration of 0.23M urea in the hydrothermal process was changed to 0.2M, and the rest of the process and conditions were the same as in Example 2.

[0045] After annealing at 427°C for 3 hours, cobalt oxide cluster arrays can be obtained before acetylene gas is introduced, and finally cobalt oxide / carbon nano cluster arrays are obtained.

[0046] Analytical tests showed that when the ventilation time was 150s, the surface morphology of cobalt monoxide changed ( Figure 2c ), the cluster array becomes more porous and the surface is covered with a layer of carbon, indicating that this morphology can also deposit carbon. The material was placed in a 6M KOH solution as a working electrode, and measured in a three-electrode system, the reference electrode was a saturated calomel electrode, and the platinum wire electrode was a counter elec...

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Abstract

The invention belongs to the technical field of production of composite capacitive materials of super capacitors, and particularly discloses a production method and application of a cobaltous oxide / carbon nanostructure array. The production method includes taking a nickel net as a substrate on the hydrothermal condition of 95 DEG C to obtain a precursor of a cobaltous oxide nano linear array; when obtaining the cobaltous oxide array through annealing, generating a graphite carbon layer with good crystallinity on the surface of cobaltous oxide by the chemical vapor deposition technology; ensuring the corresponding flow rate of the carbon source gas and nitrogen in reaction to be 6 : 80 and controlling corresponding ventilation time to obtain cobaltous oxide / carbon array materials most applicable to the supper capacitors. Carbon obtained by the method is good in crystallinity and high in electricity conductivity; after the carbon is composited with the cobaltous oxide, obtained electrode materials are good in power density and energy density performance, the specific capacity of the electrode materials can reach 3282.2F / g, 96.9% of the specific capacity is still kept after 10000-times circulation, so that the production method has good application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of novel supercapacitor composite capacitance materials, in particular to a preparation method and application of a cobalt monoxide / carbon nanostructure array. The invention uses a hydrothermal method to grow a cobalt oxide array on a nickel net, and uses this as a template to deposit carbon on the array surface by a chemical vapor deposition method to obtain a cobalt oxide / carbon nanostructure array electrode material. Background technique [0002] A supercapacitor is an energy storage device between ordinary capacitors and chemical batteries, and has the advantages of both. Its high power density, long cycle life, fast charging and discharging, and high energy density make it a hot research topic in recent years. How to improve the specific capacitance of capacitor materials and obtain better charge-discharge and cycle performance is imminent. [0003] According to different energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30B82Y30/00B82Y40/00
Inventor 唐一文汪海吕刚孙永明周炜
Owner HUAZHONG NORMAL UNIV
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