A kind of purple root water hyacinth-based hierarchical porous carbon material and its preparation method and application in supercapacitors

A hierarchical porous, water hyacinth technology, applied in the direction of hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problem of difficult to obtain porous carbon materials with high specific surface area, the influence of supercapacitor electrochemical performance, and the specific surface area of ​​porous carbon is not very large Ideal and other issues, to achieve the effect of high value-added utilization, good application value, simple and environmentally friendly preparation process

Active Publication Date: 2022-08-09
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are the following problems in the preparation of porous carbon from biomass: (1) Because the biomass such as leaves, stems and skins of plants is insoluble in water, it is difficult to contact and recombine with activators. Most of the representative biomass is roots, and its structure is denser, so it is difficult to obtain porous carbon materials with high specific surface area; (2) Most of the porous carbon prepared by research has a single pore structure, mainly microporous structure; (3) The existing porous carbon preparation process is relatively complicated, requiring a large amount of solvents and activators, and the preparation process is not green
However, for root-based biomass (such as purple root water hyacinth, etc.), the specific surface area of ​​the prepared porous carbon is still not ideal due to the difficulty in compounding with the activator, and the pores are mainly distributed in micropores, which is not conducive to the ion flow. Fast transfer in the channel, the electrochemical performance of its application in supercapacitors is affected to a certain extent
In addition, the existing activation method has problems such as complicated process, serious corrosion of equipment and high production cost.

Method used

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  • A kind of purple root water hyacinth-based hierarchical porous carbon material and its preparation method and application in supercapacitors
  • A kind of purple root water hyacinth-based hierarchical porous carbon material and its preparation method and application in supercapacitors
  • A kind of purple root water hyacinth-based hierarchical porous carbon material and its preparation method and application in supercapacitors

Examples

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Effect test

Embodiment 1

[0041] The purple root water hyacinth is mechanically pulverized to obtain 150 mesh purple root water hyacinth powder. 3 g of purple root water hyacinth powder is mixed with 1.5 g of potassium carbonate and 30 ml of deionized water, and then placed in a closed microwave reactor. After microwave treatment for 10 min, the obtained mixture was dried to obtain potassium salt-Purple root water hyacinth composite powder. According to the mass ratio of purple root water hyacinth powder and calcium salt as 2:1, the potassium salt-purple root water hyacinth composite powder and 1.5g calcium oxalate were mixed evenly, then sealed into a ball mill, the ball milling time was 4h, and the ball milling speed was set to 400rpm . Then, the mixture obtained by ball milling was put into a porcelain ark and placed in a high-temperature tube furnace. Nitrogen was used as a protective gas, and it was calcined at 800 °C for 2 hours. After cooling, it was placed in 1 mol / L hydrochloric acid and stirr...

Embodiment 2

[0043] The purple root water hyacinth is mechanically pulverized to obtain 150 mesh purple root water hyacinth powder. 3 g of purple root water hyacinth powder is mixed with 1.5 g of potassium carbonate and 30 ml of deionized water, and then placed in a microwave reactor. After treatment for 10 min, the obtained mixture was dried to obtain potassium salt-Purple root water hyacinth composite powder. According to the mass ratio of purple root water hyacinth powder and calcium salt as 2:1, the potassium salt-purple root water hyacinth composite powder and 1.5g calcium oxalate were mixed evenly, then sealed into a ball mill, the ball milling time was 4h, and the ball milling speed was set to 400rpm . Then, the mixture obtained by ball milling was put into a porcelain ark and placed in a high-temperature tube furnace. Nitrogen was used as a protective gas, and it was calcined at 800 °C for 2 hours. After cooling, it was placed in 1 mol / L hydrochloric acid and stirred for 24 hours t...

Embodiment 3

[0045] The purple root water hyacinth is mechanically pulverized to obtain 150 mesh purple root water hyacinth powder. 3 g of purple root water hyacinth powder is mixed with 2 g of potassium carbonate and 30 ml of deionized water, and then placed in a microwave reactor. Microwave treatment at 160 ° C and 500 W For 10 min, the obtained mixture was dried to obtain a potassium salt-purple root water hyacinth composite powder. According to the mass ratio of purple root water hyacinth powder and calcium salt of 3:1, the potassium salt-purple root water hyacinth composite powder and 1 g of calcium oxalate are mixed evenly, and then sealed into a ball milling tank, the ball milling time is 4h, and the ball milling speed is set to 400rpm. Then, the mixture obtained by ball milling was put into a porcelain ark and placed in a high-temperature tube furnace. Nitrogen was used as a protective gas, and it was calcined at 800 °C for 2 hours. After cooling, it was placed in 1 mol / L hydrochlor...

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Abstract

The invention discloses a hyacinth hyacinth-based graded porous carbon material, a preparation method and an application in a supercapacitor. In the method of the invention, firstly, the water hyacinth impregnated with potassium salt solution is subjected to airtight microwave reaction treatment and drying, and then calcium salt is added for ball milling and high-temperature carbonization is performed to prepare graded porous carbon. Compared with the traditional chemical activation method, the hyacinth-based hierarchical porous carbon prepared by the invention has larger specific surface area, reasonable pore structure and abundant pore size distribution; when it is applied to the supercapacitor electrode material, it can be used as an electrolyte in the electrochemical process. The fast diffusion and transport of ions provide good channels, exhibit higher specific capacitance and excellent rate performance, and have good potential application value.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials, and in particular relates to a hyacinth hyacinth-based graded porous carbon material, a preparation method thereof, and an application in a supercapacitor. Background technique [0002] Purple root water hyacinth is a genetically improved biomass of water hyacinth. Its root system accounts for more than 80% of the plant volume, and its root cap is nearly 20 times that of ordinary water hyacinth. It has a high degree of chemistry and is an ideal biomass carbon source for the preparation of porous carbon materials. Porous carbon materials are widely used in supercapacitors, lithium-ion batteries and other fields due to their good thermal stability, high mechanical stability, excellent electrical conductivity, well-developed pore structure, and large specific surface area. Among them, biomass-based hierarchical porous carbon can promote the rapid transfer of ions in the pores due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318C01B32/324C01B32/348H01G11/24H01G11/34H01G11/44
CPCC01B32/318C01B32/324C01B32/348H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 杨东杰王鹏李致贤邱学青林绪亮秦延林谭海城
Owner SOUTH CHINA UNIV OF TECH
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