Nitrogen-doped porous carbon and preparation method as well as application of nitrogen-doped porous carbon to super-capacitor electrode material

Abstract

The invention discloses nitrogen-doped porous carbon and a preparation method as well as application of the nitrogen-doped porous carbon to a super-capacitor electrode material and belongs to the technical field of energy source materials and application. The nitrogen-doped porous carbon is prepared by taking natural waste products, namely peanut shells, as raw materials through steps of carrying out ball milling, sieving, carrying out high-temperature activation and washing. The nitrogen-doped porous carbon prepared by the invention has graded pores including micro-pores and medium pores; a main pore diameter range is 2nm to 5nm, the specific surface area is 1000 square meters per gram to 1200 square meters per gram, the nitrogen mass ratio is 8 percent to 10 percent and the mass specific capacitance is 290 Faraday per gram to 310 Faraday per gram; the mass energy density of a nitrogen-doped porous carbon based super-capacitor prepared from the nitrogen-doped porous carbon is 40 watt-hour per kilogram to 43 watt-hour per kilogram; the nitrogen-doped porous carbon has excellent circulating stability so that the nitrogen-doped porous carbon can be better applied to the field of super-capacitor electrodes.

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 ...

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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.

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