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A kind of nitrogen, boron doped porous carbon for supercapacitor electrode and preparation method thereof

A supercapacitor and porous carbon technology, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problems of unsuitable supercapacitor electrode materials, low electrochemical activity, etc., and achieve broad market application prospects, high ratio Capacitance, the effect of improving pseudocapacitive characteristics

Active Publication Date: 2019-12-03
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] For example, the patent application number 201510611801.6 discloses a method for preparing a super porous carbon material with persimmon peel, using persimmon peel as a raw material, carbonized and activated to make porous carbon, the specific surface area is 1186 square meters per gram, but the electric capacity of the material Low chemical activity, not suitable as supercapacitor electrode material

Method used

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  • A kind of nitrogen, boron doped porous carbon for supercapacitor electrode and preparation method thereof
  • A kind of nitrogen, boron doped porous carbon for supercapacitor electrode and preparation method thereof
  • A kind of nitrogen, boron doped porous carbon for supercapacitor electrode and preparation method thereof

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Effect test

Embodiment 1

[0047] (1) intercept the reed stalk, peel it, dry it, adopt a tissue masher to pre-crumble it, use deionized water as a dispersant, and adopt a planetary ball mill to further ball-mill the pre-broken reed stalk, and the rotating speed is 500 rpm Minutes, ball milling time is 24 hours.

[0048] (2) The slurry after ball milling was centrifuged at a speed of 5000 rpm, and the sediment was alternately washed three times with deionized water and absolute ethanol, and dried at 50 degrees Celsius to obtain pretreated reed stalk powder.

[0049] (3) Weigh reed stalk powder, urea ammonium nitrogen fertilizer (nitrogen ≥ 30%, China Salt Anhui Hongsifang Co., Ltd.), boron fertilizer (sodium borate ≥ 99%, boron-containing ≥15%, Anhui Nongwang Agricultural Science and Technology Development Co., Ltd.) was dispersed in deionized water, heated at 160 degrees Celsius for 12 hours in a hydrothermal reaction kettle, and the precipitate was repeatedly washed alternately with deionized water and...

Embodiment 2

[0059] (1) intercept the reed stalk, peel it, dry it, adopt a tissue masher to pre-crumble it, use deionized water as a dispersant, and adopt a planetary ball mill to further ball-mill the pre-broken reed stalk, and the rotating speed is 500 rpm Minutes, ball milling time is 24 hours.

[0060] (2) The slurry after ball milling was centrifuged at a speed of 5000 rpm, and the sediment was alternately washed three times with deionized water and absolute ethanol, and dried at 50 degrees Celsius to obtain pretreated reed stalk powder.

[0061] (3) Take reed stalk powder, nitrogen fertilizer, boron fertilizer, and potassium hydroxide according to the mass ratio of 1:2:2:3, add an appropriate amount of deionized water to the system after mixing, continue to stir until it becomes a paste, and after 50 Dry at °C, transfer to a tube furnace, pass an argon atmosphere, first raise the temperature to 300 °C at a rate of 2 °C / min and keep it warm for 1 hour, then raise the temperature to 70...

Embodiment 3

[0065] (1) Plane the fresh and alive reed that contains root hair, cultivate after 15 days in the nitrogenous fertilizer that contains 5% mass ratio and the boron fertilizer mixed solution of 5% mass ratio, intercept reed stalk, peel, adopt tissue masher to its For pre-crushing, deionized water is used as a dispersant, and the pre-broken reed stalks are further ball-milled with a planetary ball mill at a speed of 500 rpm, and the ball-milling time is 24 hours.

[0066] (2) The slurry after ball milling was centrifuged at a speed of 5000 rpm, and the sediment was alternately washed three times with deionized water and absolute ethanol, and dried at 50 degrees Celsius to obtain pretreated reed stalk powder.

[0067] (3) Weigh the reed stalk powder and potassium hydroxide according to the mass ratio of 1:3, mix them evenly, add an appropriate amount of deionized water to the system, continue to stir until it becomes a paste, dry it at 50 degrees Celsius, and transfer it to a tube ...

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Abstract

The invention discloses a nitrogen- and boron-doped porous carbon for supercapacitor electrodes and a preparation method thereof, belonging to the technical field of energy materials and applications. The invention uses natural reed stalks as carbon source, nitrogen fertilizer and boron fertilizer as nitrogen source and boron source respectively, and is prepared through carbonization and activation process. The nitrogen- and boron-doped porous carbon prepared by the present invention has a hierarchical three-dimensional pore structure of both micropores and mesopores, the pore diameter is mainly distributed in the range of 1 to 5 nanometers, the specific surface area is 1400 to 1700 square meters per gram, and the nitrogen-doped atomic ratio 6-8%, boron-doped atomic ratio is 2-4%. When used as a supercapacitor electrode material, it has a specific capacitance of 225-250 Faradays / gram at a current density of 1 A / gram. After 5000 cycles of charge and discharge, the capacitance retention is higher than 95%, and the power density is 500 W / kg. It has an energy density of 30-35 Wh / kg.

Description

technical field [0001] The invention belongs to the technical field of energy materials and applications, and in particular relates to a nitrogen- and boron-doped porous carbon used for supercapacitor electrodes and a preparation method thereof. Background technique [0002] Porous carbon has become the preferred electrode material for supercapacitors due to its advantages such as large specific surface area, adjustable pore structure, good chemical stability and low cost. Porous carbon electrodes in supercapacitors mainly form an electric double layer at the electrode / electrolyte interface to store energy. Therefore, activated carbon materials for efficient energy storage should have a large specific surface area that is conducive to charge accumulation and facilitate electrolyte wetting and rapid ion migration. the pore structure. The study found that the heteroatom-doped porous carbon has better electrochemical performance than the traditional porous carbon. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/26H01G11/34
CPCC01P2004/03C01P2004/04C01P2006/12C01P2006/17C01P2006/40H01G11/26H01G11/34Y02E60/13
Inventor 毕红祝煜张翔
Owner ANHUI UNIVERSITY
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