Preparation method and application of starch-based mesoporous carbon with high specific surface area

A high specific surface area, starch-based technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of complex operation process, time-consuming, short cycle life of the template method, and achieve excellent electrochemical performance , Increase the specific surface area, increase the effect of mesopore volume

Pending Publication Date: 2019-11-01
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the direct carbonization method is limited by the structural diversity of the carbon source precursor, and the porous carbon structure prepared is small; the template method has a complicated operation process, takes a lot of time, and needs to remove the template after carbonization, and there are problems such as template residue; activation The more commonly used method is KOH activation. Although the prepared porous carbon material has a large specific surface area and a high specific volume, micropores are mainly introduced into the material, which does not match the organic electrolyte with a large ion size, resulting in ion transmission in the electrolyte. A series of shortcomings such as increased resistance, low specific capacity, poor rate performance, and short cycle life are difficult to meet industrial needs.

Method used

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  • Preparation method and application of starch-based mesoporous carbon with high specific surface area
  • Preparation method and application of starch-based mesoporous carbon with high specific surface area
  • Preparation method and application of starch-based mesoporous carbon with high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Add 3 g of industrial starch and 1 g of urea into 50 mL of deionized water and stir magnetically for 6 h. Then, dry the above suspension in an air-blast drying oven at 80 ° C for 12 h, take it out and place it in a tube furnace, and place it under the protection of argon. The pre-carbonization treatment was carried out at a temperature of 1 °C / min. The temperature was raised to 300 °C at a rate of 1 °C / min, and the temperature was kept at a constant temperature for 30 minutes. After cooling naturally to room temperature, the pre-carbonized product was obtained; : 1 mixed and added to 10mL of deionized water, stirred evenly, dried in a blast oven at 80°C for 12 hours, then taken out and placed in a tube furnace, and subjected to high-temperature activation treatment under the protection of argon at a temperature of 1°C / The heating rate was increased to 600°C for 30 minutes, and the temperature was kept constant for 30 minutes. After natural cooling to room temperature, t...

Embodiment 2

[0018] Add 2 g of industrial starch and 5 g of dicyandiamide into 100 mL of deionized water and stir magnetically for 3 h. Then, place the above suspension in a blast drying oven at 60°C for 8 h, take it out and place it in a tube furnace, and place it in a helium Carry out pre-carbonization treatment under air protection, the temperature is raised to 400°C at a heating rate of 3°C / min, and the temperature is kept at a constant temperature for 60min. After natural cooling to room temperature, the pre-carbonized product is obtained; Mixed at a ratio of 1:6 and added to 30mL of deionized water, stirred evenly, dried in a blast drying oven at 70°C for 8 hours, taken out and placed in a tube furnace, and subjected to high-temperature activation treatment under the protection of helium at a temperature of 3 The heating rate of ℃ / min was raised to 800 ℃, the temperature was kept constant for 60 minutes, and after natural cooling to room temperature, the activated product was obtained...

Embodiment 3

[0020] Add 5 g of industrial starch and 7 g of melamine into 70 mL of deionized water and stir magnetically for 24 h. Then, put the above suspension in a blast drying oven at 100 ° C for 16 h, take it out and place it in a tube furnace, and place it under the protection of argon. Carry out pre-carbonization treatment at a temperature of 15°C / min to 500°C at a rate of 15°C / min, keep the temperature for 50 minutes, and cool to room temperature naturally to obtain a pre-carbonized product; : 0.5 mixed and added to 70mL of deionized water, stirred evenly, dried in an 80°C blast drying oven for 16 hours, taken out and placed in a tube furnace, and subjected to high-temperature activation treatment under the protection of argon at a temperature of 15°C / The heating rate was raised to 1100°C, kept at a constant temperature for 50 minutes, and after natural cooling to room temperature, the activated product was obtained; then the obtained activated product was added to 150 mL of hydroc...

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Abstract

The invention relates to the technical field of carbon materials and new energy sources, in particular to a preparation method and application of starch-based mesoporous carbon with high specific surface area. The preparation method comprises the following steps: (1) adding industrial starch and a nitrogen source into deionized water and magnetically stirring, drying the industrial starch and thenitrogen source in a drying box, then taking out and placing the industrial starch and the nitrogen source in a tube furnace, and carrying out pre-carbonization treatment under the protection of inertgas, (2) mixing the pre-carbonization product obtained in the step 1 and potassium hydroxide, adding the mixture into deionized water, uniformly stirring, then drying the mixture in the drying box, taking out and placing the mixture in the tube furnace, and carrying out high-temperature activation treatment under the protection of the inert gas; and (3) adding the activated product obtained in the step 2 into a hydrochloric acid solution, carrying out suction filtration after magnetic stirring, and washing with deionized water until filtrate is neutral, and drying the filtrate in the drying box to obtain a target material. The preparation method is simple in operation process, the equipment cost is low, and a high-performance supercapacitor electrode material can be provided.

Description

technical field [0001] The invention relates to a preparation method and application of starch-based mesoporous carbon with high specific surface area, and belongs to the technical field of carbon materials and new energy sources. Background technique [0002] Supercapacitor is a new type of energy storage device that has emerged in recent years between batteries and traditional capacitors. It has long service life, fast reversible charge and discharge, high power density, good cycle stability and wide operating temperature range. It is widely used in many fields such as power balance power supply of starting device, starting power supply of vehicle and emergency system. Electrode material is one of the important factors determining the performance of supercapacitors. Porous carbon materials have become the most commonly used electrode materials for supercapacitors due to their excellent electrical conductivity, good stability, high specific surface area, easily regulated p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/24H01G11/34H01G11/44
CPCC01P2006/12C01P2006/14C01P2006/40C01B32/318C01B32/348H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 于畅余金河邱介山郭威王钊李少锋杨乐谢远洋付蓉
Owner DALIAN UNIV OF TECH
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