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N and P co-doped carbon aerogel and preparation method and application thereof

A technology of carbon aerogel and co-doping, applied in chemical instruments and methods, manufacturing of hybrid/electric double layer capacitors, inorganic chemistry, etc., can solve problems such as low specific capacitance and complicated preparation methods

Inactive Publication Date: 2019-12-20
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon aerogels reported in the prior art have the problem of low specific capacitance, and the preparation method is complicated

Method used

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  • N and P co-doped carbon aerogel and preparation method and application thereof
  • N and P co-doped carbon aerogel and preparation method and application thereof

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preparation example Construction

[0024] The invention provides a kind of preparation method of N, P co-doped carbon aerogel, comprising the following steps:

[0025] Pretreating the biomass fibers with a pretreatment liquid containing sodium hypochlorite, glacial acetic acid, water and ethanol, mixing the obtained pretreated fibers with water, and performing fiber opening treatment to obtain a water-biomass fiber suspension;

[0026] The water-biomass fiber suspension was mixed with NH 4 h 2 PO 4 Freeze molding after mixing to obtain N, P co-doped cellulose airgel;

[0027] The N and P co-doped cellulose aerogels are sequentially subjected to carbonization treatment and activation treatment to obtain N and P co-doped carbon aerogels.

[0028] The invention adopts the pretreatment liquid containing sodium hypochlorite, glacial acetic acid, water and ethanol to pretreat the biomass fiber, mixes the obtained pretreated fiber with water, and performs fiber opening treatment to obtain the water-biomass fiber su...

Embodiment 1

[0041] Mix 1g of cattail fiber, 1g of sodium hypochlorite, 0.2mL of glacial acetic acid, 100mL of water and 100mL of ethanol, stir at 400rpm for 1h, then add 1g of sodium hypochlorite and 0.2mL of glacial acetic acid, and continue stirring for 1h; The obtained solid material is washed to neutrality to obtain pretreated fibers; the pretreated fibers are mixed with water, and the cell ultrasonic breaker is used to sonicate for 15 minutes under the condition of 1000W ultrasonic power to obtain a water-typha fiber suspension with a mass concentration of 0.8% ;

[0042] By water - cattail fiber suspension and NH 4 h 2 PO 4 The mass ratio is 1:2, the water-typha fiber suspension and NH 4 h 2 PO 4 Mixing, and then freezing and forming (the temperature is -50°C, the time is 80h), to obtain N, P co-doped cellulose airgel;

[0043] Put the N, P co-doped cellulose airgel into a tube furnace, and carry out carbonization treatment under the protection of nitrogen, the nitrogen flow r...

Embodiment 2

[0045] Mix 7g of kapok fiber, 7g of sodium hypochlorite, 0.5mL of glacial acetic acid, 350mL of water and 350mL of ethanol, stir at 500rpm for 1h, then add 7g of sodium hypochlorite and 0.5mL of glacial acetic acid, and continue stirring for 1h; The obtained solid material was washed to neutrality to obtain pretreated fibers; the pretreated fibers were mixed with water, and the cell ultrasonic breaker was used to sonicate for 13 minutes under the condition of 1200W ultrasonic power to obtain a water-kapok fiber suspension with a mass concentration of 0.8% ;

[0046] By water - kapok fiber suspension and NH 4 h 2 PO 4 The mass ratio is 1:1, the water-kapok fiber suspension and NH 4 h 2 PO 4 Mixing, and then freezing and molding (at a temperature of -50°C and a time of 72 hours) to obtain N and P co-doped cellulose airgel;

[0047] Put the N, P co-doped cellulose airgel into a tube furnace, and carry out carbonization treatment under the protection of nitrogen, the nitroge...

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Abstract

The invention relates to the technical field of carbon aerogels, in particular to an N and P co-doped carbon aerogel and a preparation method and application thereof. The N and P co-doped carbon aerogel is prepared by using biomass fiber as raw material through acidic NaClO2 pretreatment, NH4H2PO4 doping, freezing molding, carbonization treatment and activation treatment, and the method is simplein operation, fully utilizes renewable natural resources, has wide raw material sources, and is green and environment-friendly; wherein, NH4H2PO4 is used as both dopant and activator, which not only saves the cost of raw materials, but also makes the preparation process simple and suitable for large-scale production due to one-step doping of N and P. N and P co-doping overcomes the limitation of low specific capacitance of carbon material itself, and combines two-step activation (carbonization treatment is the first step activation, activation treatment is the second step activation) to make the obtained N and P co-doped carbon aerogel have ultra-high mesoporous ratio, which not only controls the cost but also achieves excellent electrochemical performance effect.

Description

technical field [0001] The invention relates to the technical field of carbon airgel, in particular to an N, P co-doped carbon airgel and its preparation method and application. Background technique [0002] Carbon airgel is a new type of porous carbon material, which combines the characteristics of high porosity and high specific surface area of ​​airgel with the advantages of electrical conductivity, high temperature resistance, acid and alkali resistance, and degradability of carbon materials. It has potential application value in the fields of carrier, adsorption material and electrochemistry. [0003] In recent years, carbon aerogels have attracted extensive attention from researchers in the field of supercapacitors as electrode materials. However, the carbon aerogels reported in the prior art have the problem of low specific capacitance, and the preparation method is complicated. Contents of the invention [0004] The object of the present invention is to provide a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/44H01G11/34H01G11/86
CPCC01B32/318C01B32/348H01G11/34H01G11/44H01G11/86Y02E60/13
Inventor 刘守新李伟孙佳明马春慧罗沙鄂雷
Owner NORTHEAST FORESTRY UNIVERSITY
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