Method for preparing electrode material of supercapacitor from mimosa pudica

A technology for supercapacitors and electrode materials, applied in the field of electrochemistry, to achieve the effects of mild reaction conditions, good repeatability, and rapid growth

Active Publication Date: 2016-05-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report on the use of mimosa branches and leaves to prepare activated carbon materials for supercapacitors at home and abroad.

Method used

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  • Method for preparing electrode material of supercapacitor from mimosa pudica
  • Method for preparing electrode material of supercapacitor from mimosa pudica
  • Method for preparing electrode material of supercapacitor from mimosa pudica

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Embodiment 1

[0023] 15g of cut fresh mimosa were washed 3 times with absolute ethanol and deionized water, and then placed in a vacuum freeze dryer for 24 hours at a vacuum degree of 4.0Pa and at -103°C for lyophilization. Put the mimosa in a quartz boat and put it into a tube furnace. Under the protection of argon, first raise the temperature to 200°C at a heating rate of 5°C / min, carbonize at a low temperature for 1 hour, then raise the temperature to 800°C, and carbonize at a high temperature for 3 hours. After it was cooled to room temperature, the carbonized product was taken out, ground into powder, washed three times with absolute ethanol, and dried in an oven at 60°C for 10 hours to obtain Mimosa biochar (C-MP).

[0024] Mix and grind Mimosa biochar and analytically pure potassium hydroxide solid at a mass ratio of 1:0.5, then place in a box-type atmosphere furnace, and raise the temperature at a heating rate of 5°C / min under the protection of argon To 600°C, continue to activate f...

Embodiment 2

[0027] 15g of cut fresh mimosa were washed 3 times with absolute ethanol and deionized water, and then placed in a vacuum freeze dryer for 24 hours at a vacuum degree of 4.0Pa and at -103°C for lyophilization. Put the mimosa in a quartz boat and put it into a tube furnace. Under the protection of argon, first raise the temperature to 300°C at a rate of 5°C / min, carbonize at a low temperature for 3 hours, then raise the temperature to 600°C, and carbonize at a high temperature for 2 hours. After it was cooled to room temperature, the carbonized product was taken out, ground into powder, washed 6 times with absolute ethanol, and finally the carbonized product was dried in an oven at 80°C for 7 hours to obtain Mimosa biochar.

[0028] Mix and grind Mimosa biochar and analytically pure potassium hydroxide solid at a mass ratio of 1:4, then place them in a box-type atmosphere furnace, and raise the temperature at a heating rate of 5°C / min under the protection of argon To 900°C, con...

Embodiment 3

[0031] 15g of cut fresh mimosa were washed 3 times with absolute ethanol and deionized water, and then placed in a vacuum freeze dryer for 24 hours at a vacuum degree of 4.0Pa and at -103°C for lyophilization. Put mimosa in a quartz boat and put it into a tube furnace. Under the protection of argon, first raise the temperature to 400°C at a rate of 5°C / min, carbonize at low temperature for 2 hours, then raise the temperature to 750°C, and carbonize at high temperature for 2 hours. After it was cooled to room temperature, the carbonized product was taken out, ground into powder, washed 4 times with absolute ethanol, and dried in an oven at 70 °C for 10 h to obtain Mimosa biochar (C-MP).

[0032]Mix and grind Mimosa biochar and analytically pure potassium hydroxide solid at a mass ratio of 1:2, then place it in a box-type atmosphere furnace, and raise the temperature at a heating rate of 5°C / min under the protection of argon To 750°C, continue to activate for 2 hours, wait for i...

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Abstract

The invention relates to a method for preparing an electrode material of a supercapacitor from mimosa pudica. The method mainly includes the steps that mimosa pudica is freeze-dried in vacuum, carbonized at the low temperature of 200 DEG C-400 DEG C and then carbonized at the low temperature of 600 DEG C-800 DEG C in a tube type resistance furnace, biochar and analytically pure potassium hydroxide are mixed uniformly by the mass ratio of 1:0.5-4 and carbonized for 0.5-3 h at the constant temperature ranging from 600 DEG C to 900 DEG C in a box-type atmosphere furnace, and an activated product is subjected to acid treatment, centrifugally washed to be neutral and dried to obtain the electrode material of the supercapacitor. The method is simple in synthesis step, relative moderate in reaction condition, high in repeatability, high in yield and easy to industrialize on a large scale; the specific surface area of the prepared electrode material of the supercapacitor reaches up to 1307 m<2>/g, the measured capacitance reaches up to 250 F/g under the current density of 1A/g in a 6M KOH solution, cycling stability is good, and the electrode material of the supercapacitor is relatively ideal.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a supercapacitor electrode material. Background technique [0002] As we all know, energy issues are related to the world's economic development and social stability. With the rapid development of science and technology, the rapid development of portable electronic equipment, hybrid electric vehicles, national defense technology, and aerospace has made the market's demand for high-power energy storage components increasingly urgent. Scientists are rapidly discovering a new type of electrical energy storage element to solve energy problems—supercapacitors, also known as electrochemical capacitors. Supercapacitor has the advantages of high power density, fast charge and discharge rate, long cycle life, safety and environmental protection, etc. It is a new type of energy storage device between the rapid charge and discharge of traditional capacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12H01G11/34
CPCY02E60/13H01G11/34C01P2002/72C01P2004/03C01P2006/40
Inventor 高发明尹航周军双张俊川王栋
Owner YANSHAN UNIV
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