Preparation And Properties Of Spike Metal Oxide Electrode

With the rapid development of science and technology,energy problem has become the focus of today’s society.In the research and development of various energy storage devices,ultracapacitors have been extensively studied due to their uniqueness.The electrode material of supercapacitor is the core part of supercapacitor,and the common electrode material is composed of metal oxide,carbon material and conductive polymer.Metal oxides are favored by researchers because of their high theoretical capacitance,low cost and environmental friendliness,and they are considered as electrode materials for supercapacitors with excellent development prospects.However,the poor cycling stability of single metal oxides limits the development and application of supercapacitors.Based on metal oxides Co3O4,NiCo2O4,ZnMn2O4 for a major role in the study,by using the method of hot water to carry on the corresponding synthesis,and by using XRD,SEM,EDS,preparation of materials for the phase composition,microstructure and element distribution characterization testing,at the same time using the wuhan branch,electrochemical workstation in preparation of materials for electrochemical performance test and analysis.The main research contents are as follows:(1)The factors affecting the preparation process of Co3O4 and the corresponding electrochemical properties were studied.Using cobalt chloride hexahydrate,urea and ammonium fluoride as raw materials,Co3O4 electrode material was synthesized by hydrothermal and calcination process.The effects of the hydrothermal time and amount of ammonium fluoride addition on the Morphological characteristics and Supercapacitor performance of the prepared Co3O4 material were studied different experimental parameters have different effects on the preparation process,and the effect of hydrothermal time is more significant.When the hydrothermal time is 7h and the addition amount of ammonium fluoride is 3mmol,the synthesized materials not only have good morphology,but also have better electrochemical properties.The microsphere structure composed of nanowires is beneficial to provide a larger specific area to contact with the electrolyte liquid phase,and make it contact with the electrolyte phase in the system,and the void structure can transport ions strongly and increase the reaction rate.(2)The factors affecting the preparation process of NiCo2O4 and the corresponding supercapacitance properties were studied.Using cobalt nitrate hexahydrate,urea,and nickel acetate as raw materials in the reaction system,NiCo2O4 was obtained by hydrothermal method and subsequent calcination process.At the same time,the morphology characteristics of the products and the performance of the supercapacitor were studied It is found through experiments that the morphology of the obtained material is the spherical structure woven by nanowires and nanowires under the hydrothermal time of 8 hours.Compared with the other time,the spherical structure becomes more regular and larger in size.Under the hydrothermal time,the material has good morphology and excellent supercapacitor performance There is a void structure inside the sphere woven by nanowires,which makes the material have good wettability and facilitate the embedding and embedding of ions inside the sphere(3)The factors affecting the preparation process of ZnMn2O4 and the corresponding electrochemical properties were studied.Using ammonia bicarbonate as precipitator,ZnMn2O4 material was successfully prepared by simple hydrothermal method and subsequent calcination process.ZnMn2O4 materials with different structures were obtained by adjusting the hydrothermal temperature.When the hydrothermal time was 180℃,the product morphology was a spherical structure composed of nanosheets with relatively regular shape and uniform distribution.At the same time,the electrochemical performance was the best under this parameter.The pore structure of ZnMn2O4 material is conducive to the entry of ionic materials in the electrolyte into the material,thus making the rate of REDOX reaction faster.