A kind of nitrogen-doped porous carbon, its preparation method and its application as supercapacitor electrode material

A technology of porous carbon and nitrogen doping, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, chemical instruments and methods, etc., can solve the problems of limiting the application value of porous carbon reagents, low energy density, etc. Utilization, high specific capacitance and energy density, improving the effect of electric double layer capacitance and pseudocapacitance

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature Liang Q, Ye L, Huang Z H, et al.Ahoneycomb-like porous carbon derived from pomelo peel for use in high-performance supercapacitors[J].Nanoscale,2014,6(22):13831-13837. Using natural waste Honeycomb-shaped porous carbon made from pomelo peels has a specific capacitance of 342 Faradays / g and a maximum energy density of 9.4 Wh / kg. The low energy density also limits the reagent application value of the porous carbon.

Method used

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  • A kind of nitrogen-doped porous carbon, its preparation method and its application as supercapacitor electrode material
  • A kind of nitrogen-doped porous carbon, its preparation method and its application as supercapacitor electrode material
  • A kind of nitrogen-doped porous carbon, its preparation method and its application as supercapacitor electrode material

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Embodiment 1

[0037](1) Take the natural waste peanut shells, wash them in deionized water, dry them in the air, and pre-crumble them with a tissue grinder; then, use deionized water as a dispersant, and use a planetary ball mill to further grind the pre-crushed peanut shells For processing, the rotating speed is 500 rpm, and the ball milling time is 12 hours.

[0038] (2) The slurry after ball milling is sieved through a 250-mesh screen cloth, and the filtrate is centrifuged at a speed of 8000 rpm to obtain a precipitate, which is repeatedly ultrasonically washed 3 times with absolute ethanol and deionized water, and the centrifugal precipitate is subjected to Obtain pretreated peanut shell powder after drying at 50 degrees centigrade.

[0039] (3) Weigh 0.5 grams of peanut shell powder and 1 gram of melamine, grind them evenly, then add 1 gram of potassium hydroxide and 5 milliliters of deionized water to the system, continue to grind until uniform, and transfer them to a drying oven at 5...

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Abstract

The invention discloses a nitrogen-doped porous carbon, a preparation method and its application as a supercapacitor electrode, belonging to the technical field of energy materials and applications. The invention uses the natural waste product peanut shells as raw materials, and prepares nitrogen-doped porous carbon after ball milling, sieving, high-temperature activation and washing. The nitrogen-doped porous carbon prepared by this method has hierarchical pores of micropores and mesopores, the pore diameter is mainly distributed in the range of 2 to 5 nanometers, the specific surface area is 1000 to 1200 square meters per gram, and the mass ratio of nitrogen content is 8 to 10%. The specific capacitance is 290-310 Faradays / g, and the mass energy density of the prepared nitrogen-doped porous carbon-based supercapacitor is 40-43 Wh / kg, and has excellent cycle stability, so it can be better used in supercapacitors. Capacitor electrode field.

Description

technical field [0001] The invention belongs to the technical field of energy materials and applications, and in particular relates to a nitrogen-doped porous carbon, a preparation method and its application as a supercapacitor electrode. Background technique [0002] Porous carbon is often used as a supercapacitor electrode material due to its special porous structure, high specific surface area, stable chemical structure, good capacitive performance, and low price, but its low conductivity, low energy density and other factors severely limit it. its practical commercial application. In recent years, nitrogen-doped porous carbons have attracted extensive attention due to their superior electrochemical performance compared with traditional porous carbons. [0003] The raw materials and methods for preparing porous carbon are various. For example, the patent application number 201510004277.6 discloses a method for preparing porous carbon. Polycarboxylic acid and diamine are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324C01B32/378H01G11/32H01G11/26H01G11/86
CPCY02E60/13
Inventor 毕红张翔
Owner ANHUI UNIVERSITY
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