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Preparation method and application of biomass porous carbon sheet based on kapok fiber

A kapok fiber and porous carbon technology is applied in the field of preparation of biomass porous carbon sheets, which can solve the problems of unfavorable electrolyte ion diffusion and movement, poor high current charging and discharging capability of electrode materials, etc. The effect of specific surface area

Inactive Publication Date: 2019-08-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lack of pores in the reported kapok fiber-based carbon materials is not conducive to the diffusion and movement of electrolyte ions in the electrode materials, so the high-current charge and discharge capabilities of the electrode materials are relatively poor.

Method used

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  • Preparation method and application of biomass porous carbon sheet based on kapok fiber
  • Preparation method and application of biomass porous carbon sheet based on kapok fiber
  • Preparation method and application of biomass porous carbon sheet based on kapok fiber

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preparation example Construction

[0028] (3) Precursor preparation: take pre-carbonized kapok fiber and place it in a beaker, add activator and deionized water, stir evenly, ultrasonically disperse for 0.5-1 h, and then put it in a drying oven at 60 °C for 12-24 h , obtain carbonized precursor mixture after grinding; Wherein, the weight ratio of activator and pre-carbonized kapok fiber is 1:1-10:1, is preferably 4:1-6:1, and the consumption of deionized water is expressed as per gram Use 5-50 mL of pre-carbonized kapok fiber; the activator used includes any one of potassium hydroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, phosphoric acid, sulfuric acid, potassium thiocyanate, and zinc chloride;

[0029] (4) Preparation of porous carbon sheets: Take the obtained carbonized precursor mixture and place it in a 20 mL graphite crucible, then fill it with carbon powder in a 40 mL porcelain crucible, put it into a box-type resistance furnace, and heat it up to 400 -1100°C, prefe...

Embodiment 1

[0034] (1) Put the kapok fiber in a beaker, add 5% sodium hydroxide aqueous solution, stir evenly, put it on the heater and boil for 0.5 h, then cool to room temperature, use a vacuum filter pump, use deionized water Repeated suction filtration and washing until the filtrate is neutral; then put the washed kapok fibers into a beaker, add an appropriate amount of ethanol solution for cleaning, and finally put them in a drying oven and dry them at 60 °C for 24 hours to obtain pretreated kapok fibers ;

[0035] (2) Take an appropriate amount of pretreated kapok fiber and put it in a 20 mL porcelain crucible, cover the lid, fix it with iron wire, then fill it with carbon powder in a 40 mL porcelain crucible, put it into a box-type resistance furnace, Raise the temperature to 500 °C, keep it warm for 2 hours, take it out after cooling to room temperature, and obtain pre-carbonized kapok fibers;

[0036](3) Take 1 g of the obtained pre-carbonized kapok fiber and put it in a 100 mL ...

Embodiment 2

[0042] (1) The pretreatment step of kapok fiber is the same as embodiment 1 step (1);

[0043] (2) Take an appropriate amount of pretreated kapok fiber and put it in a 20 mL porcelain crucible, cover the lid, fix it with iron wire, then fill it with carbon powder in a 40 mL porcelain crucible, put it into a box-type resistance furnace, Raise the temperature to 500 °C, keep it warm for 2 hours, take it out after cooling to room temperature, and obtain pre-carbonized kapok fibers;

[0044] (3) Take 1 g of the obtained pre-carbonized kapok fiber and put it in a 100 mL beaker, add 5 g of potassium hydroxide solid and 20 mL of deionized water, stir evenly and ultrasonically disperse for 0.5 h, then put the beaker in a drying oven for 60 After drying at ℃ for 24 h, the carbonized precursor mixture was obtained after grinding;

[0045] (4) Put the obtained carbonized precursor mixture into a 20 mL graphite crucible, screw on the lid, and then fill it with carbon powder in a 40 mL po...

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Abstract

The invention provides a preparation method and an application of a biomass porous carbon plate based on kapok fibers and belongs to the technical field of biomass carbon material preparation. The preparation method comprises the following steps: after pre-treatment on the kapok fibers with an alkaline solution, firstly pre-carbonizing the kapok fibers at a relatively low temperature; then adding an activating agent and deionized water; performing ultrasonic treatment and drying to obtain a carbonized precursor mixture; and finally, performing normal pressure high-temperature pyrolysis to obtain the biomass porous carbon plate. The biomass porous carbon plate prepared by the preparation method is large in specific surface area and excellent in electrochemical property, can be used for preparing a supercapacitor electrode material, is simple in preparation method and provides a novel path for preparing the biomass carbon material.

Description

technical field [0001] The invention belongs to the technical field of biomass carbon material preparation, and in particular relates to a preparation method and application of a kapok fiber-based biomass porous carbon sheet. Background technique [0002] Biomass is a variety of organisms produced through photosynthesis using the atmosphere, water, and land. It mainly refers to lignocellulose such as straws and trees other than grain and fruits in the process of agricultural and forestry production, leftovers from agricultural product processing, and agricultural and forestry waste. The most important features are wide sources, low cost, and renewable, and carbon materials prepared from biomass have high specific surface area, good conductivity, and wettability, and are considered to be supercapacitors. Ideal for electrode materials. However, the morphology and performance of carbon materials obtained from different biomass raw materials are quite different. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01G11/24
CPCY02E60/13
Inventor 吕秋丰王钧锐陈明慧梁恕侠靳艳巧
Owner FUZHOU UNIV
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