Preparation And Electrochemical Properties Of Vanadium Nitride Porous Nanoribbons And Its Composite With Carbon

Because of its high power density,long cycle life,fast charge and discharge speed and good stability,super capacitors are widely used in independent power sources,electric vehicles and mobile electronic devices.Electrode materials are the main factors that affect the performance of supercapacitors.Therefore,the research and development of excellent electrode materials is of great significance for improving the performance of supercapacitors.In recent years,metal nitride?such as vanadium nitride,titanium nitride,etc.?has attracted wide attention because of its high specific capacitance.In this paper,several different structures of vanadium nitride?VN?nanomaterials and their carbon complexes were prepared,and their capacitance properties were analyzed and optimized.The DC arc discharge method,using metal vanadium as raw material,nitrogen into the preparation of granular structure of vanadium nitride,by hydrothermal method with ammonium metavanadate as raw materials,preparation of vanadium oxide in the environment of high temperature sealed,after ammonia treatment to get nano porous structure with vanadium nitride,two kinds of different applications the structure of the vanadium nitride materials to the super capacitor,after comparison,the performance of nano porous structure of vanadium nitride super capacitor is far better than the particle structure of vanadium nitride super capacitor.The band structure of porous nano vanadium nitride super capacitor in the three electrode system testing in the maximum specific capacitance can reach 151.2F.g^-11 in two electrode system testing,nano porous structure of vanadium nitride super capacitor maximum specific capacitance can reach 93.5F.g^-1,the porous nanobelts of vanadium nitrogen material button capacitor,after 5000 cycles.The capacitance retention rate is 66%.The composite materials were prepared by hydrothermal method with ammonium vanadate and graphene as raw materials.The composite materials were obtained by ammoniation of materials and plate-like graphene and porous nanoribbons vanadium nitride.By the hydrothermal method with ammonium metavanadate and multi walled carbon nanotubes as raw material,in the experimental environment of high temperature sealing prepared under the composite materials in ammoniation of materials,get the coil structure in multi walled carbon nanotubes and nano porous structure of vanadium nitride composites.By comparing the electrochemical performances of two kinds of composite materials and six formulations of supercapacitors,it can be seen that the performance of composite materials with porous nanobelts and vanadium nitride and graphene is much better than that of porous nanostructures,vanadium nitride and carbon nanotubes.And by comparing the formula?graphene more?material its best electrochemical performance in three electrode system to test the maximum specific capacitance can reach 186F.g^-11 in the double electrode test system under the maximum specific capacitance is 168.8F.g^-1,after 5000 cycles,the cycle life of up to 82.8%.