Preparation Of Microporous Carbon From Sucrose And Its Electrochemical Properties

With the advantage of excellent power rate, high efficiency, long cycle life, non-polluting, a wide temperature range and instantaneous large current discharge and so on, supercapacitor has aroused wide spread interests. Because the electrochemical performance of supercapacitors mainly depends on the electrode material. It is very important to develope the materials with high capacitance and improve the existing preparation of electrode materials. In this paper, different types of electrode materials were prepared by easy methods. The three aspects of the research are listed as follows:(1) Microporous carbon materials were prepared by carbonization of sulfuric acid-pretreated sucrose at different temperature. The samples were investigated by physical characterization of thermal gravimetric analysis (TGA) and Raman spectra. The specific surface area and pore size distribution of samples were measured and analyzed by N2adsorption-desorption. By electrochemical test, it was found that the sample carbonized at800?with the highest specific surface area and a main pore size of0.75nm displayed excellent electrochemical properties. This sample exhibited the highest specific capacitance (232F/g) at a current density of0.1A/g.(2) Co3O4samples were synthesized by adding the surfactant (SDS) and not. The phase and morphology of samples were characterized by SEM, XRD. By electrochemical test, it was found that the sample adding SDS exhibited the highest specific capacitance (167.2F/g) even at a current density of8A/g.(3) Bi2S3nanoribbons were synthesized with a biomolecule of DL-methionine by the hydrothermal method. The morphology and structure of the products can be controlled by adjusting the reaction parameters. Uniform Bi2S3nanoribbons can be controllably synthesized at200?when the molar ratio of Bi(NO3)3to DL-methionine in the synthesis system is2:3.