Research On The Preparations Of Porous Co₃O₄ And NiO And Their Supercapacities

Mesoporous molecular sieves is a kind of porous inorganic materials, its pore size is in the range of 2-50 nm. It has large surface area, ordered pore array and good thermal stability, so it can be widely used in catalyst, seperator, nano-reactor, medicine release, photoelectric sensor, and so forth. Based on the investigation of literatures, in this thesis several typical mesoporous materials were prepared and characterized. It mainly includes: the synthesis of ordered mesoporous KIT-6 and SBA-15 using a triblock copolymer (EO20PO70EO20) as soft template in aqueous solution and the synthesis of Co3O4 and NiO mesoporous materials using the above-prepared KIT-6 and SBA-15 as hard templates. Then changed the synthesis conditions of Co3O4 and NiO, studied the relationship between synthesis conditions and sample structures.Then the samples are characterized by X-ray diffraction, Transmission Electron Microscope and N2 adsorption-desorption isotherms.The prepared KIT-6 and SBA-15 as hard templates were impregnated with the solutions of cobalt nitrate and nickel nitrate separately, stirred, dried and calcined to obtain the high-quality mesoporous metal oxides.On the basis of the above expriments we changed the mesoporous molecular sieve templates, material match and temperature of calcine gradually to study the effects on metal oxides by N2 adsorption-desorption isotherms and other characterizations.As a new kind of energy storage component, electrochemical capacitor (EC) is characterized with high energy density, high power density, long life time and wide temperature range for using. Studies on ECs are mainly focused on the preparation of high performance electrode materials. The electrochemical characteristics of the Co3O4 and NiO mesoporous materials were studied by Cyclic Voltammetry and constant current charge/discharge. The result showed that the samples have favorable super capacitance. Then the relationships between super capacitance, BET surface areas and the pore structures were discussed.