Morphology Control of TiO2 Nanotubes towards High-Efficient Electrodes for Supercapacitor
This article studies the role of electrochemical parameters in controlling the morphology of oxidized TiO2 nanotubes and the electrochemical performance of modified TiO2 nanotubes.Humidity is a key factor for fabricating TiO2 nanotubes.When the relative humidity belows 70％,the TiO2 nanotubes can be successfully prepared.What's more,by changing the anodization voltage and time,the diameter and the length of TiO2 nanotubes can be adjusted.In addition,the TiO2 nanotubes are modified through electrochemical self-doping and loading Pt metal particles on the surface of the nanotubes,which promotes the performance of the supercapacitor.The sample anodized at 100 V for 3 h has a specific capacity of up to 2.576 mF/cm2 at a scan rate of 100 mV/s after self-doping,and its capacity retention rate still remains at 89.55％after 5 000 cycles,demonstrating excellent cycling stability.The Pt-modified sample has a specific capacity of up to 3.486 mF/cm2 at the same scan rate,exhibiting more outstanding electrochemical performance.
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