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Directional synthesis method of biomass activated carbon-based electrode material containing micropore-mesopore channels and application thereof

A technology of directional synthesis and activated carbon, which is applied in the direction of nanotechnology, chemical instruments and methods, hybrid capacitor electrodes, etc. for materials and surface science, can solve the problems of poor charge and discharge current response, complex process flow, and high preparation cost. Achieve the effect of improving response ability, wide source of raw materials, and reducing preparation cost

Active Publication Date: 2020-06-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the existing directional synthesis methods listed above have their own advantages, the disadvantage is that they all use expensive precursors such as graphene or carbon nanotubes, which cannot be considered from the perspective of economy and simplified process flow, resulting in their The technological process is too complicated and the preparation cost is too high
In addition, the prepared electrode material has poor response ability to charge and discharge current at high current density, which needs to be further improved.

Method used

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  • Directional synthesis method of biomass activated carbon-based electrode material containing micropore-mesopore channels and application thereof
  • Directional synthesis method of biomass activated carbon-based electrode material containing micropore-mesopore channels and application thereof
  • Directional synthesis method of biomass activated carbon-based electrode material containing micropore-mesopore channels and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The flow chart of biomass activated carbon-based electrode material is as follows: figure 1 shown.

[0044] Take an appropriate amount of dried Sargassum, fully wash and dry at 105°C for 72 hours, crush the Sargasso into powder with a pulverizer, and sieve the Sargassum powder with an 80-mesh sieve.

[0045] Take 10g of Sargassum powder in a beaker, add NH 3 ·H 2 O (5wt.%) solution 100mL, it was sealed with plastic wrap and placed in a water bath for 80 ° C, 12h water bath heating, then the mixture was evaporated to dryness in a drying oven, the obtained solid was broken again and passed 80 mesh sieves obtain the Sargassum powder pretreated with ammonia water.

[0046] Take the sargassum powder pretreated by ammonia water in a boat, put it into an atmosphere tube furnace, and carry out carbonization at 600°C for 3h under a nitrogen atmosphere, and the heating rate is 5°C·min -1 , and the obtained biomass semi-coke was crushed again through 80 meshes.

[0047] Take ...

Embodiment 2

[0051] Take an appropriate amount of dried Sargassum, fully wash and dry at 105°C for 72 hours, crush the Sargasso into powder with a pulverizer, and sieve the powder with an 80-mesh sieve.

[0052] Take 10g powder in a beaker, add NH 3 ·H 2 O (10wt.%) solution 100mL, it was sealed with plastic wrap and placed in a water bath for 80 ° C, 12h of water bath heating, then the mixture was placed in a drying oven and evaporated to dryness, the obtained solid was broken again and passed 80 mesh sieves obtain the Sargassum powder pretreated with ammonia water.

[0053] Take the sargassum powder pretreated by ammonia water in a boat, put it into an atmosphere tube furnace, and carry out carbonization at 600°C for 3h under a nitrogen atmosphere, and the heating rate is 5°C·min -1 . The obtained biomass semi-coke was crushed again through 80 mesh.

[0054] Take 2g of semi-coke and 8g of KOH in a boat, add 5mL of deionized water to mix evenly, and heat at 80°C for 30min to obtain a s...

Embodiment 3

[0058] Take an appropriate amount of dried Sargassum, fully wash and dry at 105°C for 72 hours, crush the Sargasso into powder with a pulverizer, and sieve the powder with an 80-mesh sieve.

[0059] Take 10g powder in a beaker, add NH 3 ·H 2 O (15wt.%) solution 100mL, it was sealed with plastic wrap and placed in a water bath for 80 ° C, 12h of water bath heating, then the mixture was placed in a drying oven and evaporated to dryness, the obtained solid was broken again and passed 80 mesh sieves obtain the Sargassum powder pretreated with ammonia water.

[0060] Take the sargassum powder pretreated by ammonia water in a boat, put it into an atmosphere tube furnace, and carry out carbonization at 600°C for 3h under a nitrogen atmosphere, and the heating rate is 5°C·min -1 . The obtained biomass semi-coke was crushed again through 80 mesh.

[0061] Take 2g of Sargassum semi-coke and 8g of KOH in a boat, add 5mL of deionized water to mix evenly, and heat at 80°C for 30min to ...

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Abstract

The invention discloses a directional synthesis method of a biomass activated carbon-based electrode material containing micropore-mesopore channels and an application thereof. Sargassum is used as araw material; NH3.H2O is introduced to carry out pretreatment on the biomass; chemical bonds between cellulose / hemicellulose / lignin are broken; the material chemical activity is enhanced, meanwhile, part of lignin is removed; the cellulose / hemicellulose ratio is increased, hard carbon removal is realized, an activating agent permeates into a carbon fiber structure more efficiently, and pore etching is reinforced by virtue of defects formed after lignin removal, so that formation of a three-dimensional porous channel is promoted, and the response capability of the material to high current is remarkably improved. The supercapacitor electrode material is prepared from the marine biomass, the preparation process is simple, the cost is low, the pollution is small, the material has relatively high mass specific capacitance and excellent cycling stability and rate capability, and the material is a process which has a potential application value, turns waste into wealth and is beneficial to realization of large-scale industrial synthesis.

Description

technical field [0001] The invention belongs to the technical field of energy chemical industry for energy storage materials and biomass solid waste reuse, and specifically relates to a directional synthesis method and application of biomass activated carbon-based electrode materials containing micropore-mesoporous channels. Background technique [0002] As a green energy storage tool, supercapacitors have been paid more and more attention due to their high specific capacitance, excellent cycle performance, long cycle life and charge-discharge rate. Nowadays, supercapacitors have been widely used in fields such as hybrid electric vehicles, portable electronic equipment, power equipment and medical equipment. Based on their charge storage mechanism, supercapacitors are generally classified into electric double layer capacitors and pseudocapacitors. Electric double-layer capacitors store electrical energy through highly reversible electrostatic adsorption of charges at the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/348H01G11/34B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B32/318C01B32/348H01G11/34Y02E60/13
Inventor 郭飞强贾小芃梁爽占银玻周惠明钱琳
Owner CHINA UNIV OF MINING & TECH
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