Preparation method of sulfur, nitrogen and phosphorus codoped porous carbon material for supercapacitor

Abstract

The invention discloses a preparation method of a sulfur, nitrogen and phosphorus codoped porous carbon material for a supercapacitor, and belongs to the technical field of a new energy source. Ginkgoleaves are used as a carbon source; deionized water is used for cleaning and removing surface impurities; after cleaning and drying, crushing is performed; the crushed ginkgo leaves and complex alkali metal hydroxide are uniformly mixed; in inert gas, the temperature is raised at a speed rate of 5 DEG C / min to reach activation temperature; heat insulation is performed for 2h to obtain an activated product; finally, the activated product is subjected to acid washing neutralization; deionized water is used for cleaning until a neutral state is reached; drying, grinding and sieving are performedto obtain the porous carbon material for the supercapacitor. The ginkgo leaves are used as raw materials for preparing the carbon material for the supercapacitor; the energy is saved; the environmentis protected; the process is simple; the cost is low; the sulfur, nitrogen and phosphorus self doping can be realized, so that the electrochemical active sites are increased; the wettability with electrolyte is enhanced; the porous carbon material has wide market application prospects when being used as a supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of new energy, and specifically relates to a method for preparing a supercapacitor co-doped porous carbon material with sulfur, nitrogen and phosphorus. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device with performance 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, supercapacitor Capacitors 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] Porous carbon materials have become the preferred electrode materials for supercapacitors due to their advantages such as large specific surface area, good ...

AI Technical Summary

Problems solved by technology

However, in the traditional preparation of activated carbon, the raw materials of activated carbon mainly come from coal, petroleum and their derivatives. The preparation of activated carbon from these materials is not only cumbersome and expensive, but also the raw materials used are not renewable.

[0004] The patent application documents of Chinese patent application numbers CN201710337066.3, CN201710147209.4 and CN201710128592.9 disclose the preparation method of carbon electrode materials. Ginkgo biloba is used as the carbon source, and porous carbon is prepared after high-temperature activation for modifying oxides. Conductivity of electrode materials, not covered for their application in supercapacitors

For example: Chinese patent application number 201410072550.4 discloses the preparation method of nitrogen / phosphorus co-doped shrimp shell-based porous carbon electrode material, using natural waste shrimp shells as carbon source, and making porous carbon 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

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