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Preparation method of nitrogen-oxygen-doped carbon nanotubes/porous carbon

A technology of carbon nanotubes and porous carbon, which is applied in the direction of carbon nanotubes, carbon preparation/purification, nano-carbon, etc., can solve the problems of limiting the performance and utilization of electric double layer capacitance of carbon materials, low specific surface area, etc. Effect of shaping carbon structure, increasing doping amount, mitigating deposition and agglomeration

Active Publication Date: 2019-10-18
陕西浦士达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon nanotubes in carbon-based materials are considered to be the most promising electrode materials for supercapacitors due to their high electronic conductivity and rich pore structure, but their low specific surface area limits the use of carbon materials for electric double layer capacitance.

Method used

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  • Preparation method of nitrogen-oxygen-doped carbon nanotubes/porous carbon
  • Preparation method of nitrogen-oxygen-doped carbon nanotubes/porous carbon
  • Preparation method of nitrogen-oxygen-doped carbon nanotubes/porous carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing nitrogen-oxygen-doped carbon nanotubes / porous carbon, comprising: providing aniline monomers to polymerize to form polyaniline particles, performing carburizing treatment on the polyaniline particles to obtain precursor pellets, and pre-oxidizing the precursor pellets treatment and pyrolysis treatment. The nitrogen and oxygen atoms in the composite carbon material introduce electron acceptor characteristics into the structure of the composite carbon material to generate a pseudocapacitive reaction, increase the wettability of the interface between the electrode material and the electrolyte, and have a positive effect on the wetting of the porous carbon pore wall. By further increasing The exposed surface of the composite carbon material further improves the charge storage capacity, enabling the composite carbon material to obtain a large specific capacity, high rate performance and excellent cycle stability.

[0037] The molar ratio of aniline and...

Embodiment 2

[0047] A preparation method of nitrogen-oxygen-doped carbon nanotube / porous carbon, comprising the following specific steps:

[0048] 1) Add 8 times the amount of aniline monomer into a 0.1mol / L dilute hydrochloric acid solution, stir and dissolve to obtain a mixed solution A, then stir and dissolve ammonium persulfate in 5 times the amount, 0.1mol / L dilute hydrochloric acid solution to obtain a mixed solution B. After cooling the two to 0°C respectively, pour the mixed solution B into the mixed solution A and stir for 3 minutes, then magnetically stir in an ice bath at 0°C for 8.5 hours, then centrifuge the resulting dark green precipitate, and then use 0.1mol / L Aqueous ammonia solution and deionized water were washed to neutrality, and after the filtrate was colorless, it was dried at 80°C to obtain polyaniline particles, and the molar ratio of the above-mentioned aniline to ammonium persulfate was 1.25:1;

[0049] 2) After mixing the obtained polyaniline particles with the ...

Embodiment 3

[0054] The differences between this embodiment and embodiment 2 are:

[0055] Step 5) Mix the quartz plate product and the quartz boat product evenly to obtain a mixed powder, then add 2mol / L dilute nitric acid solution, and after ultrasonic stirring at a temperature of 90°C for 20min, centrifuge, and the resulting precipitate is washed with deionized water until Neutral, the filtrate is colorless and then dried at 130°C to obtain a nitrogen-oxygen-doped carbon nanotube / porous carbon composite carbon material. The above dilute nitric acid solution contains 0.05mM citric acid and 0.03mM pentaerythritol, and the mixed powder Under the action of ultrasonic waves, the carbon nanotubes are easy to bombard the carbon nanotubes to knock out carbon atoms, and the carbon atoms stay in the interstitial positions of the lattice to generate interstitial atoms. The interstitial atoms will cause further defects in the carbon structure lattice and form on the composite carbon material. A sma...

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Abstract

The invention provides a preparation method of nitrogen-oxygen-doped carbon nanotubes / porous carbon, and belongs to the field of energy storage materials and technologies. The preparation method includes the steps that aniline monomers are provided to polymerize to form polyaniline particles, precursor tablets are obtained by carburizing the polyaniline particles, and the preoxidation treatment and the high temperature pyrolysis treatment are conducted on the precursor tablets; in an end product, namely a nitrogen-oxygen-doped carbon nanotubes / porous carbon composite carbon material, the nitrogen-doped amount is 6-12 wt%, and the oxygen-doped amount is 4-8 wt%. According to the prepared nitrogen-oxygen-doped carbon nanotubes / porous carbon, the charge storage capacity is high, the infiltration with an electrolyte and the dispersion stability are good, and the conductivity and the pore structure utilization are high; and the preparation method can increase active sites of a precursor toincrease the doping amount of nitrogen and oxygen atoms in the carbon material, diffusion resistance of dissociated activated carbon is lowered, the expansion effect of pyrolysis and the change of gravitation of the precursor are changed to increase the graphitization degree of the precursor and the yield of the composite carbon material, the carbon tube agglomeration and shrinkage rate is decreased, and the volume expansion effect during charging and discharging is alleviated.

Description

technical field [0001] The invention belongs to the field of energy storage materials and technologies, and in particular relates to a preparation method of nitrogen-oxygen-doped carbon nanotube / porous carbon. Background technique [0002] Supercapacitors, also known as "electrochemical capacitors", have been extensively studied due to their high power and long cycle performance of conventional capacitors and high energy density of rechargeable batteries. They are widely used in digital products, power electric vehicles and renewable energy storage devices, and are considered to be very promising energy storage devices. The electrode materials of supercapacitors directly affect the performance of supercapacitors, so the preparation of electrode materials with high specific capacitance, high specific power and specific energy, and stable charge and discharge becomes the key to solving the problem. [0003] At present, the electrode materials of supercapacitors are mainly div...

Claims

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Application Information

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IPC IPC(8): C01B32/16C01B32/05C01B32/178C01B32/17H01G11/36H01G11/26H01G11/86
CPCC01B32/05C01B32/16C01B32/17C01B32/178H01G11/26H01G11/36H01G11/86Y02E60/13
Inventor 杨金顺魏凤珍王珏
Owner 陕西浦士达环保科技有限公司
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