Morphology Control of TiO₂ Nanotubes towards High-Efficient Electrodes for Supercapacitor

Abstract

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.

Keywords

TiO₂ nanotube / anodization / conductivity / supercapacitor

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Funding

National Natural Science Foundation of China(12004070)