Supercapacitor of TiO2 nanofibers by electrospinning and KOH treatment

• The conductivity of TiO2 can be greatly enhanced only after KOH treatment, fabricated by electrospinning technique.
• The specific capacitance of TiO2 treated by KOH is dramatically enhanced from 0.04 Fg-1 to 65.84 Fg-1 (1 mVs-1 ).
• The treated TiO2 nanofibers exhibit a good cycling stability by remaining 78 % of the capacitance after 10 000 cycles.

Electrode material of TiO2 nanofiber was fabricated by electrospinning technique and a post treatment by KOH. Compared with the pristine TiO2, KOH treated fibers become much more conductive and thus are suitable for supercapacitor. The specific capacitance of treated TiO2 is dramatically enhanced from 0.04 F g− 1 to 65.84 F g− 1 at 1 mV s− 1 and is about 1500 times higher than that of the pristine. This value is also about several times higher than those of conductive TiO2 obtained by anodic oxidation or hydrogen annealing. Besides, the treated TiO2 nanofibers exhibit a good rate characteristics and cycling stability by remaining 78% of the capacitance with increasing the scan rate from 1 mV s− 1 to 1 V s− 1 and 90% after 10,000 cycles, respectively.

In this work, electrode material of TiO2 nanofiber was fabricated by electrospinning technique and a post treatment by KOH. We can see from the figure that the equivalent series resistance (ESR) does not show remarkable change and keep almost stable near 3 Ω for all current densities, also indicating that the TiO2 can be more conductive by KOH treatment and CV processing. The energy density decreases with increasing power density, which is thought to be the reason to power the LED. In fact, our experimental proves that the specific capacitance of treated TiO2 nanotube is dramatically enhanced from 0.04 F g− 1 to 65.84 F g− 1 (1 mV s− 1), about 1500 times higher than that of the pristine and also bigger than the data reported in literatures.Figure optionsDownload as PowerPoint slide