Nitrogen and sulfur codoped porous carbon material and preparation and application methods thereof

Abstract

The invention discloses a nitrogen and sulfur codoped porous carbon material. The nitrogen and sulfur codoped porous carbon material is prepared by subjecting glucose, melamine, dimethyl sulfoxide andconcentrated sulfuric acid to protonation and performing operations such as heating reaction and calcined activation. According to the nitrogen and sulfur codoped porous carbon material, the range ofthe specific surface area is 1203.9-1932.1 m2 g-1, the mean pore size is uniform in distribution within a range of 1.421-3.627 nm. The preparation method of the nitrogen and sulfur codoped porous carbon material comprises 1) protonation of melamine, 2) preparation of a nitrogen and sulfur-containing precursor, 3) activation of the nitrogen and sulfur-containing precursor, and 4) aftertreatment ofthe nitrogen and sulfur-containing precursor. The invention also discloses application of the nitrogen and sulfur codoped porous carbon material as a supercapacitor electrode material, and when the electric current density is 1 A g-1, the range of the capacitance of the nitrogen and sulfur codoped porous carbon material is 180-293 F g-1. Protonation treatment of the concentrated sulfuric acid onthe melamine adjusts the electron structure of the melamine to produce the nitrogen and sulfur codoped porous carbon material high in content of nitrogen; the dimethyl sulfoxide is high in polarity and hydrophilicity and favorable to doping reaction with hydroxyl of the glucose. Therefore, the prepared nitrogen and sulfur codoped porous carbon material is excellent in electrochemical properties and has an application prospect in the field of supercapacitors.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a nitrogen-sulfur co-doped porous carbon material and its preparation method and application. Background technique [0002] As a new type of high-efficiency energy storage device, supercapacitors have a series of advantages such as high power density, long cycle life, high charge and discharge efficiency, maintenance-free, energy saving and environmental protection, etc., and are quickly used in electric vehicles, electric power, railways, consumer electronics products It has been applied in many fields. At present, there are three main categories of electrode materials used in supercapacitors: carbon-based materials, metal oxides, and conductive polymers. Porous carbon materials in carbon-based materials have become the most widely used class due to their good physical and chemical properties, such as large specific surface area, controllable pore structure, stable chem...

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Problems solved by technology

[0005] Therefore, the prior art has the following problems: 1. Low nitrogen content; 2. Small specific surface area; 3. Low specific capacitance

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