The Preparation Of NiO/MoO_x Composite Nanostructure And Its Supercapacitor's Properties Study

Supercapacitors,with high power density,fast charging/discharging,environmental friendly and long cycle life,make it has a wide application field and a huge market prospects,therefore,attracted the attention of researcher all over the world.As we know that,the performance and cost of the electrode materials,not only directly decide the performance and cost of supercapacitor,but also impact on the application and industrialization.Therefore,researching a low-cost,high-performance electrode materials is a hot issue in the field of electrochemical capacitor research.As the metal oxide composite material has a better performance than the single metal oxide for the supercapacitor's electrode materials,so has drawn a lot of attention from the researchers.This paper mainly studied the composite materials of molybdenum oxide?MoO₂,MoO₃?and nickel oxide?NiO?,and proposed two methods to improve the problems that existed in the composite materials.The specific content is as follows:?1?We synthesized the composite materials of NiO/MoO₂ by hydrothermal method in nickel foam substrate;whice has a hollow and reticular structure,and studied the electrochemical properties of the material.The material has a high specific capacity?reached 742 F/g,which is higher than other single NiO or MoO₂ materials?,but due to the poor conductivity of metal oxides,the rate capability and cycle stability is not satisfied?the specific capacity attenuate 33%,only after 4000 cycles under the current density of 10 mA/cm²?.?2?In order to solve the problem of the NiO/MoO₂ composite materials,we designed a 3D“core/shell”structure of ZnO@NiO/MoO₂ by introducing ZnO nanorods array and studied its electrochemical properties.The experimental results show that the ZnO@NiO/MoO₂ composites not only has a higher specific capacity?which is 983 F/g?than the NiO/MoO₂ composite material,but also has a higher rate capability and cycle stability?the retention rate is as high as 91.7%after 4000 cycles under the current density of 10 mA/cm²?than the NiO/MoO₂ composites materials.?3?In order to further improve the performance of composite materials of Nickel oxide and Molybdenum oxide,we synthesized the composite materials of Graphene@NiO/MoO₃ by hydrothermal method in nickel foam substrate through the introduction of high conductivity of Graphene,and studied the electrochemical properties of the material.For comparison,we also synthesized the composite materials of NiO/MoO₃ under the same conditions.The experimental results show that,the introduction of Graphene enormously enhanced the specific capacity and cycle stability of the NiO/MoO₃ composites materials.