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Preparation method of nitrogen sulfur co-doped carbon nanosheet material

A technology of nitrogen-sulfur co-doping and carbon nanosheets, which is applied in nano-carbon, electrical components, battery electrodes, etc., can solve problems such as pollution and post-processing difficulties

Active Publication Date: 2019-11-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods also bring certain difficulties and pollution to post-processing, such as using hydrofluoric acid to dissolve silica

Method used

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  • Preparation method of nitrogen sulfur co-doped carbon nanosheet material
  • Preparation method of nitrogen sulfur co-doped carbon nanosheet material
  • Preparation method of nitrogen sulfur co-doped carbon nanosheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 1g sodium carboxymethylcellulose in 100mL deionized water, stir magnetically for 6-8h; weigh 10g potassium chloride and dissolve it in sodium carboxymethylcellulose solution, mix the obtained sodium carboxymethylcellulose After the solution was frozen at -12°C for 24 hours, a solid sample was obtained and placed in a -48°C environment for freeze-drying for 48 hours; the dried sample was carbonized in a high-temperature nitrogen atmosphere, the carbonization temperature was 800°C, and the carbonization time was 2 hours The carbonized product is washed 4 to 5 times with deionized water, and vacuum dried at 80° C. for 12 hours to obtain a carbon nanosheet material.

[0038] The SEM test results show that the obtained carbon material has a sheet-like structure with a sheet thickness of 10 to 26 nm, but the XPS test results show that the content of nitrogen and sulfur elements is zero, and the XRD test shows that there is no crystallization peak of inorganic salts.

Embodiment 2

[0040] Dissolve 1g sodium carboxymethylcellulose and 2g thiourea in 100mL deionized water, stir magnetically for 6-8h; weigh 15g potassium chloride, and dissolve it in sodium carboxymethylcellulose solution, the resulting carboxymethyl The sodium cellulose mixed solution was frozen at -12°C for 24 hours to obtain a solid sample, which was freeze-dried in an environment of -48°C for 48 hours; the dried sample was carbonized in a high-temperature nitrogen atmosphere, and the carbonization temperature was 800°C. The carbonization time is 2 hours; the carbonized product is washed with deionized water for 4 to 5 times, and vacuum dried at 80° C. for 12 hours to obtain nitrogen and sulfur co-doped carbon nanosheet materials.

[0041] The SEM test results show that the final carbon material presents a sheet-like structure with a thickness of 5-10nm. At the same time, the SEM element distribution map shows that nitrogen, oxygen and sulfur are evenly distributed in the carbon material; XPS...

Embodiment 3

[0043] Dissolve 1g sodium carboxymethylcellulose and 1g thiourea in 100mL deionized water, stir magnetically for 6-8h; weigh 15g potassium chloride and 1g potassium nitrate, and dissolve them in sodium carboxymethylcellulose solution to obtain The mixed solution of sodium carboxymethyl cellulose was frozen at -12°C for 24h to obtain a solid sample, which was freeze-dried in an environment of -48°C for 48h; the dried sample was carbonized in a high temperature nitrogen atmosphere, and the carbonization temperature The carbonization time is 800°C, and the carbonization time is 2h; the carbonized product is washed with deionized water for 4 to 5 times, and vacuum dried at 80°C for 12 hours to obtain nitrogen and sulfur co-doped carbon nanosheet materials.

[0044] The applicant has verified that the thickness of the carbon nanosheet material co-doped with nitrogen and sulfur is 5-6nm ( figure 1 ), and nitrogen, oxygen and sulfur are evenly distributed in the carbon material ( figure...

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Abstract

The invention relates to a preparation method of a nitrogen sulfur co-doped carbon nanosheet material. The method includes the steps of: 1) dissolving sodium carboxymethylcellulose in water, and stirring the substances evenly to obtain a sodium carboxymethylcellulose solution; 2) adding a molten salt into the sodium carboxymethylcellulose solution obtained in step 1), and stirring the substances evenly to obtain a mixed solution, with the molten salt being any one or a mixture of several of sodium chloride, potassium chloride, sodium nitrate and potassium nitrate; 3) subjecting the mixed solution obtained in step 2) to freeze drying to obtain a dried sample; 4) conducting carbonization treatment on the dried sample obtained in step 3) at 700-900DEG C to obtain a carbon nanosheet material crude product; and 5) conducting washing and drying on the carbon nanosheet material crude product obtained in step 4), thus obtaining a carbon nanosheet material finished product. The process adoptedby the invention is simple and environment-friendly, and can achieve large-scale industrial production of carbon nanosheet material.

Description

Technical field [0001] The invention relates to the field of carbon nano materials, in particular to a method for preparing nitrogen and sulfur co-doped carbon nano sheet materials. Background technique [0002] Two-dimensional carbon materials have significant sheet structure, high specific surface area and excellent chemical stability. Graphene is a typical representative, and it has a wide range of applications in the fields of adsorption carriers, electromagnetic shielding, supercapacitors, lithium batteries and biomedicine. [0003] At present, graphene mainly uses strong oxidizers (concentrated sulfuric acid, potassium permanganate, hydrogen peroxide, etc.) to exfoliate graphite to obtain graphene oxide, and then undergo reduction treatment to obtain sheet-layer graphene. The preparation process is relatively cumbersome, and at the same time involves a large amount of strong oxidants and post-treatments will also involve acid, which is not conducive to its scale-up production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15H01G11/36H01M4/38H01M4/583
CPCC01B32/15H01G11/36H01M4/38H01M4/583Y02E60/10
Inventor 邵自强贾帅孟星彤魏洁陈垦黄珍
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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