Preparation method and application of starch-based mesoporous carbon with high specific surface area

Abstract

The invention relates to the technical field of carbon materials and new energy sources, in particular to a preparation method and application of starch-based mesoporous carbon with high specific surface area. The preparation method comprises the following steps: (1) adding industrial starch and a nitrogen source into deionized water and magnetically stirring, drying the industrial starch and thenitrogen source in a drying box, then taking out and placing the industrial starch and the nitrogen source in a tube furnace, and carrying out pre-carbonization treatment under the protection of inertgas, (2) mixing the pre-carbonization product obtained in the step 1 and potassium hydroxide, adding the mixture into deionized water, uniformly stirring, then drying the mixture in the drying box, taking out and placing the mixture in the tube furnace, and carrying out high-temperature activation treatment under the protection of the inert gas; and (3) adding the activated product obtained in the step 2 into a hydrochloric acid solution, carrying out suction filtration after magnetic stirring, and washing with deionized water until filtrate is neutral, and drying the filtrate in the drying box to obtain a target material. The preparation method is simple in operation process, the equipment cost is low, and a high-performance supercapacitor electrode material can be provided.

Description

technical field [0001] The invention relates to a preparation method and application of starch-based mesoporous carbon with high specific surface area, and belongs to the technical field of carbon materials and new energy sources. Background technique [0002] Supercapacitor is a new type of energy storage device that has emerged in recent years between batteries and traditional capacitors. It has long service life, fast reversible charge and discharge, high power density, good cycle stability and wide operating temperature range. It is widely used in many fields such as power balance power supply of starting device, starting power supply of vehicle and emergency system. Electrode material is one of the important factors determining the performance of supercapacitors. Porous carbon materials have become the most commonly used electrode materials for supercapacitors due to their excellent electrical conductivity, good stability, high specific surface area, easily regulated p...

AI Technical Summary

Problems solved by technology

Among them, the direct carbonization method is limited by the structural diversity of the carbon source precursor, and the porous carbon structure prepared is small; the template method has a complicated operation process, takes a lot of time, and needs to remove the template after carbonization, and there are problems such as template residue; activation The more commonly used method is KOH activation. Although the prepared porous carbon material has a large specific surface area and a high specific volume, micropores are mainly introduced into the material, which does not match the organic electrolyte with a large ion size, resulting in ion transmission in the electrolyte. A series of shortcomings such as increased resistance, low specific capacity, poor rate performance, and short cycle life are difficult to meet industrial needs.

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