ITO Nanowire Prepared By Chemical Vapor Deposition And Their Application In Supercapacitor

In recent years,energy storage become one of the research hotspot,because of the active demand of renewable energy grid and the development of electirc vehicle and portable electrical appliance.Due to having many advantages,like fast response,long cycle life,supercapacitor(SC)is deemed to be used in quick adjustment of electrical power system and satisfying the demand of the power of wearable devices.However,the specific capacitance of SC need further enhance.Finding new materials and structure with high specific capacitance is an effective measure.This work enhances the specific capacitance of electrode material by compositing the active materials with high conductivity ITO nanowire and designing multilevel ITO structure.The major research results were concluded as follows:1.Preparing the ITO nanowire in the carbon paper by chemical vapor deposition and coating the PANI into the surface of ITO nanowire by the electrochemical deposition to synthesis the composite material.ITO nanowire showed cubic crystalline phase with smooth side surface and faceted shape.The diameter of the ITO nano wire is about 100nm and the length is about 3-5?m.Then we had an electrochemical test with the composite material,and we find that ITO nanowire improve the specific capacitance of the PANI effectively.When the time of electrochemical deposition was 10min,the specific capacitance was 2820 F g-1 as the current density was 1 A g-1.After 1000 times of charge-discharge test,the capacitance retention rate reached 70%and reached to 50%after 5000 times.The reason why this composite material showed high specific capacitance is that ITO nanowire provided more active site during the charge-discharge process.2.Building multilevel structure to improve the contact area of electrode and electrolyte is one of efficient method of improving specific capacitance.We prepared multilevel ITO nanowire structure by depositing the ITO nanowire into the ITO@CP electrode repeatedly.Successfully,we get the Ni3S2@multilevel ITO nanowire composite material(1-3 layers mark as ITO-?,ITO-?,ITO-?)by electric depositing the Ni3S2 nanosheet.After the electric test,the result verifies that multilevel nanometer structure could improve the electrochemical performance,as the ITO-? and ITO-?had larger specific capacitance than ITO-?.The ITO-? showed best specific capacitance.As the current density was 2 A g-1 and 30 A g-1,the specific capacitance was exactly 3006 F g-1 and 1908 F g-1.After 1000 times of charge-discharge test,the capacitance retention rate reached 70%and reached to 50%after 5000 times.Multilevel 3D nanostructure enhances the contact area,shorten the distance of ion transmission and decreases series resistance effectively.In conclusion,this article composited active materials with multilevel ITO nanowire structure which has high conductivity and high specific surface area,and was first applied to supercapacitor.As the result showed that this structure improved the specific capacitance of supercapacitor effectively.The method is useful in improving the electrochemical performance of the pseudocapacitor material...