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Preparation method of sulfur and nitrogen co-doped thin nanocarbon sheet for supercapacitor electrode

A technology of supercapacitors and carbon nanosheets, applied in the fields of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, chemical instruments and methods, etc., can solve problems such as unfavorable commercial applications, poor conductivity, and environmental pollution, and achieve Enrich the electrochemical active sites, enhance the activation effect, and reduce the production cost

Active Publication Date: 2019-03-08
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

For example, the patent application document with the Chinese patent application number 201510611801.6 discloses a method for preparing super porous carbon materials from persimmon peels. This invention uses persimmon peels as raw materials, and after carbonization and activation, porous carbon materials are prepared, with a specific surface area of ​​up to 1186m 2 / g, but its electrochemical activity is low, so it is not suitable for supercapacitor electrode materials
The patent application document with the Chinese patent application number 201410072550.4 discloses the preparation method of nitrogen / phosphorus co-doped shrimp shell-based porous carbon electrode material. The natural waste shrimp shell is used as the carbon source, and the porous carbon is prepared after high-temperature activation. The specific capacity of the capacitor can reach 205F / g, but the specific surface area is low, only up to 106m 2 / g, and its conductivity is not good, which is not conducive to commercial application
The patent application document with the Chinese patent application number 20141050858214 discloses a preparation method of a porous carbon material, and specifically relates to a preparation method of a porous carbon electrode material prepared from high-temperature-resistant polymer film scraps that are difficult to recycle and regenerate. The prepared porous carbon material Specific surface area up to 2300m 2 / g, the capacitance performance is good, but the specific capacity of the capacitor is only up to 189F / g, which is still at a low level, and the pollution is serious, and the production cost is high, which limits the wide application of porous carbon
In 2014, scientist Jongheop Yi of Seoul National University in South Korea obtained a nitrogen-doped porous carbon material by heat treatment using cigarette butts as raw materials in an ammonia atmosphere, with a specific capacitance of 153.8 F / g (Nanotechnology, 25 (2014 )345601), still at a relatively low level, and the calcination process is carried out under an ammonia atmosphere, which has great potential safety hazards and environmental pollution problems

Method used

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  • Preparation method of sulfur and nitrogen co-doped thin nanocarbon sheet for supercapacitor electrode
  • Preparation method of sulfur and nitrogen co-doped thin nanocarbon sheet for supercapacitor electrode
  • Preparation method of sulfur and nitrogen co-doped thin nanocarbon sheet for supercapacitor electrode

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Embodiment 1

[0030] (1) Pretreatment of cigarette butts: the cigarette butts are cleaned with deionized water to remove surface impurities, dried after washing, and then pulverized to obtain cigarette butt fibers.

[0031] (2) Preparation of sulfur and nitrogen co-doped thin nano-carbon sheets: Weigh 3 g of cigarette butt fibers obtained in step (1) and dissolve them in 150 ml of distilled water, then add 3.6 g of potassium hydroxide, 2.4 g of sodium hydroxide, and 3 g of thiourea and mix evenly Then put it in a rotary evaporator, stir at 80°C for 2.5 hours at a speed of 90r / min, evaporate to dryness, then transfer to a tube furnace, and raise the temperature to 800°C at a rate of 5°C / min under an Ar atmosphere. Incubate for 2 hours to obtain the activated product.

[0032] (3) Pickle the activated product obtained in step (2) with 2mol / L hydrochloric acid, then wash it with deionized water until pH = 7, place the washed porous carbon in a drying oven, and dry at a constant temperature of ...

Embodiment 2

[0034] (1) Pretreatment of cigarette butts: the cigarette butts are cleaned with deionized water to remove surface impurities, dried after washing, and then pulverized to obtain cigarette butt fibers.

[0035] (2) Preparation of sulfur and nitrogen co-doped thin nano-carbon sheets: Weigh 3 g of cigarette butt fibers obtained in step (1) and dissolve them in 150 ml of distilled water, then add 3.6 g of potassium hydroxide, 2.4 g of sodium hydroxide, and 6 g of thiourea and mix evenly Then put it in a rotary evaporator, stir at 80°C for 2.5 hours at a speed of 90r / min, evaporate to dryness, then transfer to a tube furnace, and raise the temperature to 700°C at a rate of 5°C / min under an Ar atmosphere. Incubate for 2 hours to obtain the activated product.

[0036] (3) Pickle the activated product obtained in step (2) with 2mol / L hydrochloric acid, then wash it with deionized water until pH = 7, place the washed porous carbon in a drying oven, and dry at a constant temperature of ...

Embodiment 3

[0038] (1) Pretreatment of cigarette butts: the cigarette butts are cleaned with deionized water to remove surface impurities, dried after washing, and then pulverized to obtain cigarette butt fibers.

[0039] (2) Preparation of sulfur and nitrogen co-doped thin nano-carbon sheets: Weigh 3 g of cigarette butt fibers obtained in step (1) and dissolve them in 150 ml of distilled water, then add 1.8 g of potassium hydroxide, 1.2 g of sodium hydroxide, and 3 g of thiourea and mix evenly Then put it in a rotary evaporator, stir at 80°C for 2.5 hours at a speed of 90r / min, evaporate to dryness, then transfer to a tube furnace, and raise the temperature to 600°C at a rate of 5°C / min under an Ar atmosphere. Incubate for 2 hours to obtain the activated product.

[0040] (3) Pickle the activated product obtained in step (2) with 2mol / L hydrochloric acid, then wash it with deionized water until pH = 7, place the washed porous carbon in a drying oven, and dry at a constant temperature of ...

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Abstract

The invention discloses a preparation method of a sulfur and nitrogen co-doped thin nanocarbon sheet for a supercapacitor electrode, and belongs to the technical field of new energy. The method comprises the following steps of taking waste cigarette ends as a carbon source, washing the waste cigarette ends with deionized water to remove surface impurities, carrying out grinding after washing and drying, and uniformly mixing ground powder with alkali metal hydroxide and thiourea; in inert gas, heating to an activation temperature at a speed of 5 DEG C / min, and keeping the temperature for 2 hours to obtain an activation product; and finally, carrying out acid pickling neutralization on the activation product, washing the activation product to be neutral with the deionized water, and carryingout drying, grinding and sieving to obtain the nanocarbon sheet for a supercapacitor. The invention provides a method for preparing a two-dimensional porous carbon material from the waste cigarette ends by adopting a strategy of molten alkali; the method is energy-saving, environment-friendly, simple in process and low in cost; and the prepared porous carbon material has high stability and excellent comprehensive performance, and has a wide market application prospect as a supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a thin nano-carbon sheet co-doped with sulfur and nitrogen for supercapacitor electrodes and a preparation method thereof. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device whose performance is between physical capacitor and secondary battery. It has the characteristics of high power density of physical capacitor and high energy density of secondary battery. In addition, supercapacitors also have notable features such as high efficiency and long cycle life. Therefore, supercapacitors have broad application prospects in renewable energy power generation systems, electric vehicles, information communications, aerospace and other fields. [0003] Two-dimensional porous carbon materials have become the preferred electrode materials for supercapacitors due to their advantages such as large spec...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01G11/86C01B32/324C01B32/348B82Y40/00
CPCB82Y40/00C01B32/324C01B32/348H01G11/36H01G11/86Y02E60/13Y02P20/10
Inventor 吕耀辉张伟王先鹏田华东檀杰冉松林
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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