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A kind of high capacitance hierarchical porous carbon material and its preparation method and application

A technology of multi-level pores and carbon materials, applied in the preparation/purification of carbon, hybrid capacitor electrodes, etc., can solve the problem that the specific surface area is not fully utilized, the electrolyte cannot be fully wetted, and the specific surface area of ​​mesoporous carbon is low. and other problems, to achieve the effect of good cycle stability, low raw material price and large pore volume

Active Publication Date: 2022-03-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Microporous carbon has a high specific surface area, but the pore structure is mainly concentrated in the distribution of micropores, the electrolyte cannot fully wet its surface, and the specific surface area cannot be fully utilized; while the specific surface area of ​​mesoporous carbon is low, adsorption electrolysis The amount of liquid ions is less, resulting in a lower capacity

Method used

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  • A kind of high capacitance hierarchical porous carbon material and its preparation method and application
  • A kind of high capacitance hierarchical porous carbon material and its preparation method and application
  • A kind of high capacitance hierarchical porous carbon material and its preparation method and application

Examples

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Embodiment 1

[0077] This embodiment provides a method for preparing a rod-shaped porous magnesium oxide template, wherein the preparation method includes the following steps:

[0078] Prepare magnesium chloride and sodium carbonate solutions with a concentration of 0.5mol / L respectively, and make the solutions uniform through ultrasonic dispersion;

[0079] Quickly pour the sodium carbonate solution into the magnesium chloride solution, stir for 6 hours and then crystallize at room temperature for 12 hours;

[0080] The obtained precipitate is filtered, and the obtained filter cake is dried in an oven to obtain rod-shaped magnesium carbonate trihydrate;

[0081] Then, the rod-shaped magnesium carbonate trihydrate is calcined at 650° C. to obtain the rod-shaped porous magnesium oxide template.

[0082] The scanning electron microscope picture of the rod-shaped porous magnesium oxide template prepared in this embodiment is as follows figure 1 As shown, the X-ray powder diffraction pattern ...

Embodiment 2

[0086] This embodiment provides a method for preparing a hierarchically porous carbon material, wherein the preparation method includes the following specific steps:

[0087] The rod-shaped porous magnesium oxide template prepared in Example 1 was mixed with waste tire pyrolysis oil (purchased from Qingdao Shuangxing Group) according to a mass ratio of 1.5:1, and subjected to ultrasonic treatment for 20 minutes to obtain a precursor mixture;

[0088] Then the precursor mixture was transferred to a quartz boat and placed in a horizontal tube furnace reactor, and 0.5 L / min argon was introduced to clean and replace the air in the reactor for 20 minutes, and the reactor was heated at a rate of 5 °C / min. Raise the temperature to 900°C and keep the temperature constant for 1 hour. During this period, maintain 0.4L / min argon as an inert protective gas, and the reaction pressure is 0.1MPa. After the constant temperature is over, the reactor is naturally cooled to room temperature and t...

Embodiment 3

[0095] This embodiment provides a method for preparing a hierarchically porous carbon material, wherein the preparation method includes the following specific steps:

[0096] The rod-shaped porous magnesium oxide template prepared in Example 1 was mixed with waste tire pyrolysis oil (purchased from Qingdao Shuangxing Group) in a mass ratio of 1:1, and subjected to ultrasonic treatment for 20 minutes to obtain a precursor mixture;

[0097] Then the precursor mixture was transferred to a quartz boat and placed in a horizontal tube furnace reactor, and 0.5 L / min argon was introduced to clean and replace the air in the reactor for 20 minutes, and the reactor was heated at a rate of 5 °C / min. Raise the temperature to 900°C and keep the temperature constant for 1 hour. During this period, maintain 0.4L / min argon as an inert protective gas, and the reaction pressure is 0.1MPa. After the constant temperature is over, the reactor is naturally cooled to room temperature and the reaction pr...

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Abstract

The invention provides a high-capacitance hierarchical porous carbon material and its preparation method and application. The preparation method of the high-capacitance hierarchical porous carbon material comprises: impregnating a porous metal oxide template agent with a regular microscopic shape in waste In tire pyrolysis oil, mix uniformly to obtain a precursor mixture; under an inert atmosphere, the precursor mixture is calcined to obtain a mixture of a template agent and a hierarchical porous carbon material; the template agent and the porous carbon material are removed by pickling The template agent in the mixture of hierarchical porous carbon materials, and then the obtained product is washed to neutrality and then dried to obtain the high-capacitance hierarchical porous carbon material. The hierarchical porous carbon material prepared by the present invention has few graphite layers, high specific surface area, large pore volume, the characteristics of hierarchical pore distribution and certain morphology features; the hierarchical porous carbon material is used as After being used as an electrode material for supercapacitors, it exhibits large capacitance, high capacity retention, excellent rate performance, and good cycle stability.

Description

technical field [0001] The invention relates to a high-capacity hierarchical porous carbon material, a preparation method and application thereof, and belongs to the technical field of new carbon materials. Background technique [0002] A supercapacitor is a new type of electrical energy storage device with high power density and cycle life. It is composed of electrode materials, separators and electrolytes. The commercial electrode materials commonly used in this field are generally activated carbon. During the charging process of the supercapacitor, the ions in the electrolyte are adsorbed to the inner surface of the porous electrode material under the action of the electric double layer to store the charge. The specific surface area and pore structure of the electrode material are important factors affecting the capacitance characteristics. The commercial activated carbon has a high specific surface area and can provide a large specific capacitance, but its pore structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/34H01G11/44
CPCC01B32/05H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 马新龙李圣平高金森
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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