Purple-root water hyacinth-based graded porous carbon material and preparation method and application thereof in supercapacitor

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: 2021-03-05
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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  • Purple-root water hyacinth-based graded porous carbon material and preparation method and application thereof in supercapacitor
  • Purple-root water hyacinth-based graded porous carbon material and preparation method and application thereof in supercapacitor
  • Purple-root water hyacinth-based graded porous carbon material and preparation method and application thereof in supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0041] Mechanically pulverize the purple root water hyacinth to obtain 150 mesh purple root water hyacinth powder, mix 3g of purple root water hyacinth powder with 1.5g of potassium carbonate, 30ml of deionized water and stir evenly, put it in a closed microwave reactor, and heat it at 160°C and 500W After microwave treatment for 10 min, the resulting 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, mix the potassium salt-purple water hyacinth composite powder and 1.5g calcium oxalate evenly, and then seal it into a ball mill jar. The ball milling time is 4h, and the ball milling speed is set at 400rpm . Then put the ball-milled mixture into a porcelain ark and place it in a high-temperature tube furnace, use nitrogen as a protective gas, and calcinate it at 800°C for 2 hours. After cooling down, put it in 1mol / L hydrochloric acid and stir it for 24 ...

Embodiment 2

[0043] Mechanically pulverize the purple root water hyacinth to obtain 150 mesh purple root water hyacinth powder, mix 3g of purple root water hyacinth powder with 1.5g of potassium carbonate, 30ml of deionized water and stir evenly, put it in a microwave reactor, microwave at 120°C and 400W After processing for 10 minutes, the resulting 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, mix the potassium salt-purple water hyacinth composite powder and 1.5g calcium oxalate evenly, and then seal it into a ball mill jar. The ball milling time is 4h, and the ball milling speed is set at 400rpm . Then put the ball-milled mixture into a porcelain ark and place it in a high-temperature tube furnace, use nitrogen as a protective gas, and calcinate it at 800°C for 2 hours. After cooling down, put it in 1mol / L hydrochloric acid and stir it for 24 hours to wash ...

Embodiment 3

[0045] Mechanically pulverize the purple root water hyacinth to obtain 150 mesh purple root water hyacinth powder, mix 3g purple root water hyacinth powder with 2g potassium carbonate, 30ml deionized water and stir evenly, put it in a microwave reactor, and microwave it at 160°C and 500W After 10 minutes, the resulting 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 3:1, the potassium salt-purple root water hyacinth composite powder and 1 g of calcium oxalate were mixed evenly, and then sealed into a ball mill jar. The ball milling time was 4 hours, and the ball milling speed was set at 400 rpm. Then put the ball-milled mixture into a porcelain ark and place it in a high-temperature tube furnace, use nitrogen as a protective gas, and calcinate it at 800°C for 2 hours. After cooling down, put it in 1mol / L hydrochloric acid and stir it for 24 hours to wash ...

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Abstract

The invention discloses a purple-root water hyacinth-based graded porous carbon material and a preparation method and application thereof in a supercapacitor. The method comprises the following steps:firstly, carrying out closed microwave reaction treatment on purple-root water hyacinth soaked in a potassium salt aqueous solution, conducting drying, then adding a calcium salt, carrying out ball milling, and carrying out high-temperature carbonization to prepare the graded porous carbon. Compared with porous carbon prepared through a traditional chemical activation method, the prepared purple-root water hyacinth-based graded porous carbon has the advantages of larger specific surface area, reasonable pore channel structure and rich pore size distribution; and when the graded porous carbonis applied to a supercapacitor electrode material, a good channel can be provided for rapid diffusion and transmission of electrolyte ions in the electrochemical process, higher specific capacitance and excellent rate capability are shown, and the graded porous carbon has 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 purple root water hyacinth-based hierarchical porous carbon material, a preparation method thereof and an application in a supercapacitor. Background technique [0002] Purple root water hyacinth is a genetically modified biomass of water hyacinth, its root system accounts for more than 80% of the plant volume, and the root cap is nearly 20 times that of ordinary water hyacinth. It is an ideal biomass carbon source for the preparation of porous carbon materials. Due to the advantages of good thermal stability, high mechanical stability, excellent electrical conductivity, developed pore structure, and large specific surface area, porous carbon materials are widely used in supercapacitors, lithium-ion batteries and other fields. Among them, biomass-based hierarchical porous carbon can promote the rapid transfer of ions in the pores due to its special ...

Claims

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Application Information

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Patent Type & Authority Applications(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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