A kind of biomass porous activated carbon and its preparation method and application as electric double layer capacitor electrode material

A technology of porous activated carbon and biomass raw materials, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problems of high-cost inorganic templates, non-renewable raw materials, complicated preparation steps, etc., and achieve uniform pore size and economic value. High efficiency, uniform response effect

Active Publication Date: 2021-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of these carbon materials often requires expensive, non-renewable raw materials, high-cost inorganic templates, complicated preparation steps or long preparation time and high energy consumption.

Method used

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  • A kind of biomass porous activated carbon and its preparation method and application as electric double layer capacitor electrode material
  • A kind of biomass porous activated carbon and its preparation method and application as electric double layer capacitor electrode material
  • A kind of biomass porous activated carbon and its preparation method and application as electric double layer capacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Activated carbon preparation:

[0037] (1) Carbon source preparation: choose camphor tree branches as the carbon source of the precursor, peel off the skin, take the woody main part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then pass it through a pulverizer (6000r / min , the time is 5min) it is pulverized, and sieves out 325 purpose camphor tree powder.

[0038] (2) Activation: Weigh 30g of the carbon source in (1) and place it in a tube furnace, raise the temperature to 900°C at 10°C / min under an argon atmosphere, and perform high-temperature activation treatment under a water vapor atmosphere of 1L / min 2h, and then use argon gas atmosphere to lower the temperature.

[0039] (3) Washing: Wash the product in (2) once with 2mol / L HCl and twice with water to neutrality, then filter and dry in vacuum at 80°C for 8 hours. The specific surface area of ​​the obtained activated carbon is 1387m 2 / g, the pore size is mainly concent...

Embodiment 2

[0041] Activated carbon preparation:

[0042] (1) Carbon source preparation: choose camphor tree branches as the carbon source of the precursor, peel off the skin, take the woody main part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then pass it through a pulverizer (6000r / min , the time is 5min) it is pulverized, and sieves out 325 purpose camphor tree powder.

[0043] (2) Activation: Weigh 30g of the carbon source in (1) and place it in a tube furnace, raise the temperature to 900°C at 10°C / min under an argon atmosphere, and perform high-temperature activation treatment for 2 hours under a carbon dioxide atmosphere of 1L / min , and then use argon gas atmosphere to lower the temperature.

[0044] (3) Washing: The product in (2) was washed once with 2mol / L HCl and washed twice with water to neutrality, then filtered, and vacuum-dried at 80°C for 8 hours. The specific surface area of ​​the obtained activated carbon was 990m 2 / g, the...

Embodiment 3

[0046] Activated carbon preparation:

[0047] (1) Carbon source preparation: choose camphor tree branches as the carbon source of the precursor, peel off the skin, take the woody main part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then pass it through a pulverizer (6000r / min , the time is 5min) it is pulverized, and sieves out 325 purpose camphor tree powder.

[0048] (2) Activation: Weigh 30g of the carbon source in (1) and place it in a tube furnace. 1:1) for high-temperature activation treatment for 2 hours, and then use argon gas atmosphere to lower the temperature.

[0049] (3) Washing: Wash the product in (2) once with 2mol / L HCl and twice with water to neutrality, then filter and dry in vacuum at 80°C for 8 hours. The specific surface area of ​​the obtained activated carbon is 1890m 2 / g, the pore size is mainly concentrated in the range of 2-4nm ( figure 1 ).

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Abstract

The invention discloses biomass porous activated carbon and a preparation method thereof and application of the biomass porous activated carbon as an electrode material of a double electric layer capacitor. After a biomass raw material is pulverized by a high-energy pulverizer, the biomass raw material is placed in a furnace, protective gas is introduced into the furnace, the temperature is raisedto an activation temperature under a protective atmosphere, then activation gas is introduced into the furnace for activation treatment, protective gas is introduced into the furnace again, and the temperature is lowered to a normal temperature under a protective atmosphere to obtain the biomass porous activated carbon. The method maintains an original biological structure and ordered pore structure of wood fiber in the biomass material by high-energy pulverization combined with gas activation treatment, the prepared porous activated carbon has a large specific surface area and a high mass transfer rate and is applied as the electrode material of the electric double layer capacitor, and a capacitor with high energy density and good cycle performance can be obtained; and the porous activated carbon has a low preparation cost, simple operation and a short production cycle, and meets industrial production.

Description

technical field [0001] The present invention relates to a biomass porous activated carbon, in particular to a method for preparing porous activated carbon by physical high-temperature activation of biomass materials such as camphor trees, fir trees, corn cobs, coconut shells, and durian shells through water vapor and carbon dioxide. The application of biomass porous activated carbon as an electrode material in electrochemical energy storage belongs to the technical field of preparation of electrochemical energy storage materials. Background technique [0002] Porous carbon materials have attracted much attention because of their high specific surface area, easy preparation, easy adjustment of microstructure, various forms, good electrical conductivity and electrochemical stability, and are widely used in adsorbents, catalyst supports and energy storage. At present, the source of activated carbon is mainly carbon-rich organic materials, including anthracite, asphalt, fruit sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/336C01B32/324H01G11/44H01G11/24
CPCC01B32/324C01B32/336H01G11/24H01G11/44Y02E60/13
Inventor 纪效波蔡鹏邹国强侯红帅
Owner CENT SOUTH UNIV
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