Preparation method of activated carbon material for electrochemical capacitor

Abstract

The invention discloses a preparation method of an activated carbon material for an electrochemical capacitor and belongs to the technical field of carbon material and microwave chemistry. The preparation method comprises the following steps of: using peanut shells as a raw material, processing the peanut shells by using a KOH solution and a potassium hydroxide alkali solution, transferring the peanut shells processed by the potassium hydroxide alkali solution into a corundum crucible, placing the corundum crucible into a microwave reactor for microwave heating and activation to obtain the activated carbon material for an electrochemical capacitor. According to the method, with peanut shells as a carbon source and potassium hydroxide as an activator, the activated carbon material is prepared by microwave-assisted heating of the potassium hydroxide activated peanut shells. The activated carbon material prepared by the preparation method is characterized in that its specific surface area is 990-1277m<2> / g, total pore volume is 0.47-0.63cm<3> / g, and the yield is 14.2-24.4%. The activated carbon material, which is prepared as an electrode material for an electrochemical capacitor, hasgood stability and excellent comprehensive performance.

Description

technical field

[0001] The invention belongs to the technical field of carbon materials and microwave chemistry, and in particular relates to a preparation method of activated carbon materials for electrochemical capacitors. Background technique

[0002] Activated carbon has a high specific surface area and porosity, and has a wide range of applications in the fields of energy and environmental protection. The raw materials for producing activated carbon mainly include coal, wood and other carbon-containing raw materials. Among them, coal is a one-time ore resource, which is not renewable. Woody raw materials are mainly wood and various fruit shells. Timber comes at the cost of felling trees. And the husk is renewable. my country is a big producer of peanuts, with an annual output of 5 million tons of peanut shells. Using peanut shells as a carbon source to prepare activated carbon materials for electrochemical capacitors can not only change the current situation of ext...

Examples

Embodiment 1

[0020] Embodiment 1: activated carbon AC 1－600－6 Concrete preparation process is as follows:

[0021] (1) Pretreatment of peanut shells: After cleaning and drying the peanut shells cut into small pieces with ordinary water, weigh 27g of peanut shells and place them in a beaker, add 200mL of 0.5M KOH solution, and place the beaker on a magnetic heating stirrer Heating for 2 hours, cooling to room temperature, washing peanut shells with distilled water at 70-80°C until the pH of the filtrate is 7, putting the washed peanut shells into a drying oven and drying at a constant temperature of 110°C for 12 hours to obtain pretreated peanut shells .

[0022] (2) Measure 60mL of distilled water in a beaker, weigh 9g of potassium hydroxide and dissolve in the distilled water in the beaker, stir quickly until the potassium hydroxide lye is obtained at room temperature; weigh 9g of the pretreated peanut shells obtained in step (1) , add to the lye obtained in step (2), stir with a glass ...

Embodiment 2

[0025] Example 2: Activated carbon AC 1－600－8 Concrete preparation process is as follows:

[0026] (1) Pretreatment of peanut shells: implemented in the same manner as step (1) in Example 1.

[0027] (2) Carry out the same method as step (2) in Example 1.

[0028] (3) Carry out the same method as step (3) in Example 1, except that the activation time is 8 minutes.

[0029] (4) Carry out the same method as step (4) in Example 1. The difference is that the resulting activated carbon material is labeled as AC 1－600－8 .

Embodiment 3

[0030] Example 3: AC 1－600－10 Concrete preparation process is as follows:

[0031] (1) Pretreatment of peanut shells: implemented in the same manner as step (1) in Example 1.

[0032] (2) Carry out the same method as step (2) in Example 1.

[0033] (3) Carry out the same method as step (3) in Example 1, except that the activation time is 10 minutes.

[0034] (4) Carry out the same method as step (4) in Example 1. The difference is that the resulting activated carbon material is labeled as AC 1－600－10 .

technical field

[0001] The invention belongs to the technical field of carbon materials and microwave chemistry, and in particular relates to a preparation method of activated carbon materials for electrochemical capacitors. Background technique

[0002] Activated carbon has a high specific surface area and porosity, and has a wide range of applications in the fields of energy and environmental protection. The raw materials for producing activated carbon mainly include coal, wood and other carbon-containing raw materials. Among them, coal is a one-time ore resource, which is not renewable. Woody raw materials are mainly wood and various fruit shells. Timber comes at the cost of felling trees. And the husk is renewable. my country is a big producer of peanuts, with an annual output of 5 million tons of peanut shells. Using peanut shells as a carbon source to prepare activated carbon materials for electrochemical capacitors can not only change the current situation of ext...

Examples

Embodiment 1

[0020] Embodiment 1: activated carbon AC 1－600－6 Concrete preparation process is as follows:

[0021] (1) Pretreatment of peanut shells: After cleaning and drying the peanut shells cut into small pieces with ordinary water, weigh 27g of peanut shells and place them in a beaker, add 200mL of 0.5M KOH solution, and place the beaker on a magnetic heating stirrer Heating for 2 hours, cooling to room temperature, washing peanut shells with distilled water at 70-80°C until the pH of the filtrate is 7, putting the washed peanut shells into a drying oven and drying at a constant temperature of 110°C for 12 hours to obtain pretreated peanut shells .

[0022] (2) Measure 60mL of distilled water in a beaker, weigh 9g of potassium hydroxide and dissolve in the distilled water in the beaker, stir quickly until the potassium hydroxide lye is obtained at room temperature; weigh 9g of the pretreated peanut shells obtained in step (1) , add to the lye obtained in step (2), stir with a glass ...

Embodiment 2

[0025] Example 2: Activated carbon AC 1－600－8 Concrete preparation process is as follows:

[0026] (1) Pretreatment of peanut shells: implemented in the same manner as step (1) in Example 1.

[0027] (2) Carry out the same method as step (2) in Example 1.

[0028] (3) Carry out the same method as step (3) in Example 1, except that the activation time is 8 minutes.

[0029] (4) Carry out the same method as step (4) in Example 1. The difference is that the resulting activated carbon material is labeled as AC 1－600－8 .

Embodiment 3

[0030] Example 3: AC 1－600－10 Concrete preparation process is as follows:

[0031] (1) Pretreatment of peanut shells: implemented in the same manner as step (1) in Example 1.

[0032] (2) Carry out the same method as step (2) in Example 1.

[0033] (3) Carry out the same method as step (3) in Example 1, except that the activation time is 10 minutes.

[0034] (4) Carry out the same method as step (4) in Example 1. The difference is that the resulting activated carbon material is labeled as AC 1－600－10 .

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