Preparation and application of hydrophobic Schiff base cobalt-beta cyclodextrin-graphene porous carbon composite material

Abstract

The invention relates to preparation and application of a hydrophobic Schiff base cobalt-coated beta cyclodextrin-graphene porous carbon composite material. The method comprises the following steps: synthesizing a hydrophobic 5-chlorosalicylaldehyde dicyandiamide Schiff base cobalt metal complex by adopting a homogeneous reaction kettle and an alcohol-thermal method, then forming an inclusion compound with hydrophobic beta-cyclodextrin, stably crosslinking with graphene oxide, and finally filtering, washing, drying, calcining at high temperature and the like. The material has the following advantages that the 5-chlorosalicylaldehyde dicyandiamide schiff base cobalt metal complex has a hydrophobic structure, and reaction basic conditions are provided for successful embedding of beta-cyclodextrin with an internal hydrophobic and external hydrophilic structure; a solvothermal method and a carbonization method are adopted, so that the process is simple and environment-friendly; the water/alcohol medium system enhances the dispersity of the material. When the material is used as a supercapacitor electrode material, the material is charged and discharged in a range of 0-0.4 V, the specific capacitance can reach 500-1000F/g when the discharge current density is 1A/g, and the material has excellent electrochemical characteristics and chemical stability.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a hydrophobic Schiff base cobalt@β cyclodextrin-graphene porous carbon composite material and its preparation method and application. Background technique [0002] The rapid growth of demand for new energy has promoted the development of various new energy storage or energy conversion devices. As a new type of energy storage device, supercapacitors have the advantages of high output power, short charging time, long service life, wide operating temperature range, safety and no pollution, and are a new type of green and environmentally friendly power supply. In order to meet the increasing demand for battery life of current electronic devices, the energy density of supercapacitors needs to be further improved. Researching and preparing composite electrode materials with high specific capacitance is an effective way to increase the energy density of supercapacitors. [000...

AI Technical Summary

Problems solved by technology

However, this technique did not significantly improve the specific capacitance of the electrode material (only 210 F g −1 ), and cannot effectively anchor cobalt oxides, and cannot solve problems such as agglomeration

Images