Performances of electrochemical hybrid supercapacitor of RuO2/activated carbon nanofibers from electrospinning

In this study, performances of hybrid supercapacitor with electrodes of RuO 2 /carbon were investigated. Two preparation methods adopted were the RuO 2 deposition after activation of the carbon nano-fibers and activation of RuO 2 /carbon composite nano-fibers from prepared from electrospinning. Alternatively, muti-walled carbon nanotube (MWCNT) was dispersed in the solution of polyacrylronitrile (PAN) for the dope of the electrospinning. The performances of the electrodes were investigated in 6 M of aqueous KOH solution. The electrical conductivity of the PAN based activated carbon nanofibers (ACNFs) increased from 0.42 S/cm to 0.98 S/cm by dispersions of 3wt.% of MWCNT. The capacitances of the PAN only, MWCNT/PAN, RuO 2 /PAN. RuO 2 /MWCNT/PAN based ACNFs were140, 180, 390, 530 F/g, respectively. The value was increased by 4 times by compositing of 3 wt.% of MWCNT and deposition of 20 wt.% of RuO 2 . The electrodes of only RuO 2 composite without MWCNT showed a capacitance of 460F/g exhibiting the cyclic voltamaogram of combination double layer and REDOX type behaviors. The capacitance was more efficiently improved through the compositing than the depositing at lower than 15 wt.% RuO 2 .