Preparation And Supercapacitive Performance Of VO_x/TiO₂ Nanotube Composite Arrays

As new energy stoage devices,supercapacitors have a high energy density,long cycle life,environmental-friendliness,etc.So the supercapacitors have become a hot research topic in the field of scientific research in recent years.In this paper,TiO₂ nanotube arrays were adopted as the base material,the carbon layer modified TiO₂ nanotube arrays?C-TiO₂?were fabricated to improve the electrical conductivity of TiO₂ nanotube arrays.Vanadium oxides were decorated onto C-TiO₂ nanotube arrays to prepare the electrode materials for supercapacitor.The main contents of this paper are as follows:?1?The residual ethylene glycol?EG?absorbed on the nanotube wall during anodization serves as the carbon source,and the C modified TiO₂ nanotube arrays were fabricated by quick annealing in argon to improve the electrical conductivity of TiO₂ nanotube arrays.The influence of different annealing temperature on supercapacitor performance of TiO₂ nanotube arrays has been systematically investigated.?2?VO₂/C-TiO₂ nanotube composite arrays were obtained via water bath deposition process.The relationship between supercapacitor performance and deposition time was studied and the results indicated that VO₂/C-TiO₂ nanotube composite arrays obtained by deposition time of 3 h exhibited the best performance.The specific capacitance reached 316 F g-1 at a current density of 1 A g-1,and 82% of the initial capacitance could also be maintained after 1000 galvanostatic charge discharge cycles.?3?V₂O₅/C-TiO₂ nanotube composite arrays were synthesized by cyclic voltammetry deposition process.The influence of different electrochemical deposition parameters on supercapacitor performance of V₂O₅/C-TiO₂ nanotube composite arrays was studied,showing that the V₂O₅/C-TiO₂ nanotube composite arrays electrode prepared by 6 potential cycles exhibited the best performance.The specific capacitance reached 370 F g-1 at a current density 1 A g-1.And 86% of the initial capacitance could also be maintained after 1000 galvanostatic charge discharge cycles.