Nitrogen and sulfur co-doped hierarchical porous carbon composite material, and preparation method and application thereof

A composite material and co-doping technology, which is applied in the field of nitrogen and sulfur co-doped multi-level porous carbon composite materials and its preparation, can solve the problem that the improvement of electrochemical performance is not very significant, the pore size distribution of carbon materials is single, and the waste water and gas environment Pollution and other issues, achieve excellent electrochemical performance, avoid large-area stacking and agglomeration, and reduce the generation of waste gas and wastewater

Inactive Publication Date: 2019-12-31
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, the main preparation methods of carbon materials include the template method and the template-free method. The template method usually needs to add the template in advance, and then remove the template after high-temperature carbonization. The preparation process is cumbersome and the cost is high, which is not conducive to industrial production; It consists of two steps, the high-temperature carbonization of the precursor and the subsequent chemical activation, which consumes a lot of energy, and a large amount of waste water and waste gas will be generated during the production process, causing environmental pollution. Moreover, the pore size distribution of this carbon material is relatively single, the conductivity is general, and the electrochemical Performance has also been at 100-200F g -1
In order to solve these problems, researchers have developed various nitrogen-doped modified porous carbon materials to improve the electrochemical performance, and the specific capacitance has reached 300F g -1 However, these synthesis methods also include a two-step or multi-step high-temperature carbonization process, the doped heteroatoms are relatively single, and the improvement in electrochemical performance is not very significant

Method used

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  • Nitrogen and sulfur co-doped hierarchical porous carbon composite material, and preparation method and application thereof
  • Nitrogen and sulfur co-doped hierarchical porous carbon composite material, and preparation method and application thereof
  • Nitrogen and sulfur co-doped hierarchical porous carbon composite material, and preparation method and application thereof

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Embodiment 1

[0043] [Example 1] Preparation of nitrogen and sulfur co-doped multi-level porous carbon composite material and its electrochemical performance test as a supercapacitor electrode material.

[0044] Dissolve 0.5g chitosan in 20ml acetic acid solution (0.5vol.%), fully stir at 45°C to obtain light yellow clear solution A, wherein the concentration of chitosan is 0.025g / ml; then add 0.1g amino Thiourea and 5ml 10wt.% Na 2 CO 3 aqueous solution, fully stirred to obtain a clear mixed solution B; another 2 mg of graphene oxide powder was placed in 20 ml of deionized water, and ultrasonically used for 2 hours to obtain a graphene oxide dispersion C, wherein the concentration of graphene oxide was 0.1 mg / ml; the solution B Mix and stir evenly with dispersion C at 45°C for 2h, add 0.4ml of glutaraldehyde solution (25wt.%) to the mixed solution until it is completely cross-linked to obtain a transparent hydrogel, and freeze-dry it The airgel precursor with a multi-level pore structure...

Embodiment 2

[0046] Example 2: Preparation of nitrogen and sulfur co-doped hierarchical porous carbon composite material and its electrochemical performance test as supercapacitor electrode material.

[0047] Dissolve 1.0g of gelatin in 20ml of deionized water, stir well at 60°C to obtain light yellow clear solution A, in which the concentration of gelatin is 0.05g / ml; then add 0.5g of ammonium sulfate and 5ml of 5wt.% KHCO in sequence 3 aqueous solution, fully stirred to obtain a clear mixed solution B; another 4 mg of graphene oxide powder was placed in 20 ml of deionized water, and ultrasonically applied for 2 hours to obtain a graphene oxide dispersion C, wherein the concentration of graphene oxide was 0.2 mg / ml; the solution B Mix and stir evenly with dispersion C at 60°C for 2 hours, place it at 4°C until it becomes gelatinous, and freeze-dry it to obtain an airgel precursor with a multi-level pore structure, and then transfer the above precursor to a tube In the furnace, the tempera...

Embodiment 3

[0048] Example 3: Preparation of nitrogen and sulfur co-doped hierarchical porous carbon composite material and its electrochemical performance test as supercapacitor electrode material.

[0049] Dissolve 1.0g of agarose in 20ml of deionized water and stir fully at 95°C to obtain a clear solution A, in which the concentration of agarose is 0.05g / ml; then add 1.0g of thiourea and 8ml of 20wt.% KOH aqueous solution in sequence, fully Stir to obtain a clear mixed solution B; take another 10 mg of graphene oxide powder in 20 ml of deionized water, and ultrasonically 2 hours to obtain a graphene oxide dispersion C, wherein the concentration of graphene oxide is 0.5 mg / ml; the solution B and the dispersion C was uniformly mixed and stirred at 95°C for 2h, placed at 4°C until gelatinous, and then freeze-dried to obtain an airgel precursor with a multi-level pore structure, and then moved the above precursor to a tube furnace , in a nitrogen atmosphere at a heating rate of 5°C / min to ...

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Abstract

The invention discloses a nitrogen and sulfur co-doped hierarchical porous carbon composite material, and a preparation method and an application thereof, and belongs to the technical field of supercapacitor electrode materials. A natural polymer material which is abundant in the nature, low in price and easy to obtain is used as a carbon source, graphene oxide is added to improve the conductivity, an activator and a doping agent are added in advance, and a general two-step technology (high-temperature carbonization and chemical activation) for preparing a carbon material is simplified into one-step high-temperature annealing, so that the carbon material with a high specific surface area and a hierarchical porous three-dimensional structure is obtained; and nitrogen and sulfur doping improves the electrochemical performances of the material. The composite carbon material has the advantages of high mass specific capacitance, excellent high-current rate capability, ultra-long cycle life,high mass energy density and high power density when used as a high-performance electrode material for a supercapacitor. The preparation method has the advantages of simplicity, feasibility, low requirements on reaction deices, environmental friendliness, and suitableness for industrial production.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode materials. In particular, it relates to a high-performance nitrogen-sulfur co-doped multi-level porous carbon composite material for a supercapacitor and its preparation method and application. Background technique [0002] Supercapacitor is a new type of green and environmentally friendly physical energy storage device between traditional capacitors and batteries that has emerged with the breakthrough of material science in recent years. It is the most promising type of technical device in physical energy storage. A good complement to other electrochemical energy storage technologies. This kind of device can not only store more energy, but also release the stored energy quickly, and its charging cycle can reach 100,000 times, which is superior to traditional capacitors in performance. With the advantages of fast charge-discharge performance, long cycle life and high energy dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/38H01G11/44H01G11/36
CPCC01B32/05H01G11/24H01G11/36H01G11/38H01G11/44Y02E60/13
Inventor 童华马丽娅沈新宇吕嵩
Owner WUHAN UNIV
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