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A kind of activated carbon and its preparation method and application

A technology of activated carbon and activator, applied in chemical instruments and methods, electrolytic capacitors, capacitors, etc., can solve the problems of poor electrochemical performance and low specific surface area of ​​activated carbon

Active Publication Date: 2021-04-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon prepared by physical activation method and chemical activation method in the prior art has the problems of low specific surface area and poor electrochemical performance

Method used

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  • A kind of activated carbon and its preparation method and application
  • A kind of activated carbon and its preparation method and application

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preparation example Construction

[0020] The invention provides a kind of preparation method of gac, comprises the following steps:

[0021] Combine pod shells with H 3 PO 4 After the solutions are mixed, a hydrothermal reaction is carried out to obtain coke, and the temperature of the hydrothermal reaction is 170-180°C;

[0022] Activating the coke by mixing it with an activator to obtain an activated product, the activator being KOH or NaOH;

[0023] The activated product was washed successively with hydrochloric acid and water to obtain the activated carbon.

[0024] The present invention combines bean pod shell with H 3 PO 4 After the solutions are mixed, a hydrothermal reaction is carried out to obtain coke, and the temperature of the hydrothermal reaction is 170-180°C. In the present invention, the H 3 PO 4 The mass fraction of the solution is preferably 5 to 20%, more preferably 10 to 15%, and the pod shell and H 3 PO 4 The dosage ratio of the solution is preferably 1.5-2g:50mL.

[0025] In th...

Embodiment 1

[0041] 2g bean pod shell and 50mL mass fraction are 5wt.% H 3 PO 4 The solution was mixed and ultrasonicated for 30 minutes, placed in a hydrothermal kettle at 180°C for 12 hours, and the obtained solid product was washed with ethanol and deionized water and then dried to obtain coke.

[0042] Mix and grind the coke and KOH, the mass ratio of KOH to coke is 3:1, keep it at the activation temperature of 700°C for 2 hours, and clean it to obtain a specific surface area of ​​2193m 2 g -1 Activated carbon with high specific surface area.

[0043] The obtained activated carbon is prepared into a supercapacitor electrode sheet. The preparation process is to weigh the activated carbon, acetylene black and PTFE with a mass ratio of 85:10:5 and place them in an agate grinder for grinding, and then use a desktop tablet press (6MPa) The sample is pressed on the nickel foam (collector) to make a disc electrode with a diameter of 13mm. The mass of activated carbon is about 10mg. The ele...

Embodiment 2

[0045] Same as Example 1, the only difference is that H 3 PO 4 The mass fraction of the solution is 10%.

[0046] The specific surface area of ​​the activated carbon that present embodiment makes is 2523m 2 g -1 , the specific capacitance is 301F·g -1 .

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Abstract

The invention provides an activated carbon and its preparation method and application, belonging to the technical field of activated carbon preparation. In the present invention, bean pod shells are used as raw materials, and phosphoric acid solution is added for hydrothermal treatment. By controlling the temperature of the hydrothermal reaction, the obtained coke has a certain pore structure, and the activator can enter these pore structures when activated with the activator later. In the process, the activation is more complete, so as to obtain activated carbon with a large specific surface area. The data of embodiment shows, the specific surface area of ​​the gac prepared by the preparation method provided by the invention is 1319~2570m 2 g ‑1 , prepared as a supercapacitor electrode sheet, and tested for electrochemical performance, at 100mA·g ‑1 The specific capacitance is 207~301F·g at the current density ‑1 .

Description

technical field [0001] The invention relates to the technical field of activated carbon preparation, in particular to an activated carbon and its preparation method and application. Background technique [0002] Electrochemical capacitors (also known as supercapacitors) have received extensive attention due to their fast charge-discharge, high power density, long cycle life, and environmental friendliness. Electrode material is a key factor in determining the performance of electrochemical capacitors. Activated carbon materials have the characteristics of high specific surface area, low price and good electrical conductivity, making them the preferred materials for the preparation of electrochemical capacitor electrodes. The electrochemical performance of electrochemical capacitors is greatly affected by the specific surface area of ​​activated carbon. Generally, activated carbon with a large specific surface area can obtain large specific capacitance and good electrochemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324H01G9/042H01G11/34
CPCC01B32/324C01B32/348H01G9/042H01G11/34Y02E60/13
Inventor 曹景沛吴燕赵小燕赵明冯晓博
Owner CHINA UNIV OF MINING & TECH
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