The Research On The Electrochemical Properties Of Flower-like NiO And Ni₆MnO₈ Composites And Composite Of Molybdenum Disulfide And Honeycomb Carbon Materials

At present,as the environmental pollution and the depletion of energy on the planet become seriously,efficient and environmental energy storage devices are very urgently and important for the modern society.With the advancement of technology,energy storage devices such as super capacitors have emerged.In order to meet the demanding requirements in various fields,it is necessary to continuously improve its performance to obtain more efficient energy storage devices.Nowadays,the improvement of the capacitor performance mainly depends on the electrode material,and the traditional electrode material of carbon can not meet the.performance requirements of the energy storage devices,thus,the development of new electrode materials is imperative.At present,the research of transition metal oxides,transition metal complexes and transition metal sulfides as electrode materials are very extensive,which have far-reaching impact on the future application of energy storage devices.Based on the current research direction of electrode materials,the main research contents of this paper are as follows:?1?The research on the electrochemical performance and preparation of transition metal oxide composites of NiO/Ni₆MnO₈:Due to the problems of small specific capacitance of the single transition metal oxide,poor cycle stability,low conductivity,and environmental pollution,it is difficult to achieve effective application of a single material.The combination of two or more materials can optimize the material structure and the synergy and interface effect between materials,and it can effectively improve the electrochemical performance of the material.In this paper,a flower-like NiO/Ni₆MnO₈ composite material was prepared by a simple one-step hydrothermal method.Compared to the pure NiO or Ni₆MnO₈,the composite material exhibits higher specific capacity and better cycle stability.At the same time,the resistance of the material is reduced and ion diffusion is accelerated,resulting in an excellent electrochemical characteristic.It was found that the specific capacitance of NiO/Ni₆MnO₈ reached 433F g-1 when the current density of charges and discharges was 1A g-1,and the charge efficiency keeps 90 percent after 1000 cycles of charges.?2?The research on the electrochemical performance and preparation of Molybdenum Sulfide and Porous Honeycomb Carbon Composites:Because of its unique physicochemical properties,molybdenum sulfide is widely used in supercapacitors,lithium batteries,hydrogen-produced hydrogen,and optoelectronic devices.However,molybdenum sulfide has the characteristics of weak electron transport,easy clustering,and low Coulomb efficiency,which greatly limits its practical application.The carbon material has the characteristics of high conductivity,simple preparation,stable structure and easy compounding,so that the combination of the two materials can improve the electrochemical performance of molybdenum sulfide.The experimental results show that the specific capacity of the composite material reaches 213F g-1 when the charge-discharge current density is 1A g-1,which is 3.4 times higher than that of pure molybdenum disulfide?63 F g-1?.