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a fe 2 o 3 /Carbon nanotube composite material and its preparation method and supercapacitor

A technology of carbon nanotubes and composite materials, applied in hybrid capacitor electrodes, nanotechnology, nanotechnology, etc., can solve the problems of difficult adsorption of oxide particles, inability to grow nano-iron oxide, small diameter of carbon nanotubes, etc., to achieve Good redox reaction characteristics, improved redox current, and high production efficiency

Active Publication Date: 2020-08-07
嘉善县国创新能源研究院
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when replacing multilayer graphene with carbon nanotubes, the original technology cannot grow nano-iron oxide on these carbon materials.
The reason is that carbon nanotubes have small diameter, large surface curvature, and small molecular force, which makes oxide particles less likely to adsorb on the surface of carbon nanotubes.

Method used

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  • a fe <sub>2</sub> o <sub>3</sub> /Carbon nanotube composite material and its preparation method and supercapacitor
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  • a fe <sub>2</sub> o <sub>3</sub> /Carbon nanotube composite material and its preparation method and supercapacitor

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preparation example Construction

[0042] For this reason, the applicant improves the process, see Figure 8 , is a kind of Fe in the present invention 2 o 3 / The flow chart of the preparation method of carbon nanotube composite material, comprises the following steps:

[0043] Step S1: Measure DMF and distilled water, mix well and use it as a mixed solvent;

[0044] Step S2: Weigh a certain amount of carbon nanotubes and add them to the mixed solvent prepared in step S1, and uniformly disperse the carbon nanotubes in the solvent by ultrasound to obtain a carbon nanotube dispersion; wherein, the carbon nanotubes in the mixed solution The concentration is 0.5~2mg / mL;

[0045] Step S3: Weigh ferrous chloride tetrahydrate and anhydrous sodium acetate into the carbon nanotube dispersion prepared in step S2, stir and mix evenly by magnetic force; meanwhile, adjust the pH value of the mixed solution to pH = 6. Then put it into a water bath of 60-90 degrees, and continue to stir in the water bath; wherein, the conc...

Embodiment 1

[0052] (1) Measure 8mL of DMF and 2mL of distilled water, and mix them uniformly as a mixed solvent.

[0053] (2) Weighing 20 mg of carbon nanotubes and adding them to the mixture of DMF and distilled water, and ultrasonicating for 3 hours, so that the carbon nanotubes are evenly dispersed in the solvent to obtain a carbon nanotube dispersion. The concentration of carbon nanotubes in the mixed solution was 2 mg / mL.

[0054] (3) Weigh 100 mg of ferrous oxide tetrahydrate and 200 mg of anhydrous sodium acetate, and stir magnetically for 10 minutes. The pH of the mixture was adjusted to pH=6 by 5% HCl. Then put it into a 70-degree water bath, continue magnetic stirring, the stirring speed is 300 rpm, and the stirring time is 2 hours. The concentration of ferrous chloride tetrahydrate is 10 mg / mL relative to the concentration in the mixed solution, and the molar concentration ratio of anhydrous sodium acetate to ferrous chloride tetrahydrate is 4.878:1.

[0055] (4) After cooli...

Embodiment 2

[0065] (1) Measure 8mL of DMF and 2mL of distilled water, and mix them uniformly as a mixed solvent.

[0066] (2) Weighing 10 mg of carbon nanotubes and adding them to a mixture of DMF and distilled water, and ultrasonicating for 3 hours to uniformly disperse the carbon nanotubes in the solvent to obtain a carbon nanotube dispersion. The concentration of carbon nanotubes in the mixed solution was 1 mg / mL.

[0067] (3) Weigh 120 mg of ferrous oxide tetrahydrate and 247.5 mg of anhydrous sodium acetate, that is, the concentration of ferrous chloride tetrahydrate is 12 mg / mL relative to the concentration in the mixed solution, and anhydrous sodium acetate is 12 mg / mL relative to the concentration of tetrahydrate chloride The molar concentration ratio of ferrous iron is 5:1. Stir magnetically for 10 minutes. The pH of the mixture was adjusted to pH=6 by 5% HCl. Put into 60 degree water bath then, continue to carry out magnetic stirring, stirring speed 300 revs per minute, stirr...

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Abstract

The invention discloses an Fe2O3 / carbon nanotube composite material, a preparation method thereof and a supercapacitor, wherein the weight ratio of nano Fe2O3 in the composite material is 50-60%, wherein the diameter of the nano Fe2O3 particles is less than 10nm, and the nano Fe2O3 particles are uniformly loaded on the surface of the carbon nanotube. Adopting the technical proposal of the invention, the performance of the material on the supercapacitor is as follows: the total weight of the composite material is taken as the weight of the active substance, the maximum specific capacity of 940F / g can be achieved under the constant current of 2A / g under the voltage window of -1.2 to -0.4 V and good rate capability is achieved, and the specific capacity of 873,834,796,754,711,645 mAh / g can beachieved under the current of 4, 6, 8, 10, 12 and 15 A / g. The capacity and magnification properties of the material provided by the invention are the optimal at present.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to a Fe 2 o 3 / Carbon nanotube composite material and its preparation method and supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between traditional capacitors and rechargeable batteries. It has the characteristics of fast charging and discharging, and also has the energy storage mechanism of electrochemical batteries. Compared with traditional capacitors, supercapacitors have the characteristics of high power density, long cycle life, no pollution, and wide operating temperature range. At present, supercapacitors that have been marketed mainly use carbon materials with high specific surface area, which mainly rely on electric double layer capacitors for energy storage, and their specific capacitance needs to be further improved. The current research hotspot is the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36H01G11/46Y02E60/13
Inventor 徐军明杨成明李苗姚亚
Owner 嘉善县国创新能源研究院
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