| 초록 |
We, in this study, focus on the effect of the carbon nanotubes when the RuO2/carbon-CNT composite nanofiber web is used as electrodes of supercapacitor. At first, the PAN-CNT fiber web was prepared by an electrospinning technique to use the mixed solution of both polyacrylonitrile (PAN) in N,N–dimethylformamide (DMF) and 3 wt.% carbon nanotube (CNT). The electrospun PAN-CNT fiber web was stabilized at 280℃, and then carbon-CNT nanofiber web was synthesized by activating at 800℃ in the steam atmosphere. Finally, the RuO2/carbon-CNT composite nanofiber web was prepared by coating ruthenium oxide precursor. The specific capacitances of 20 wt.% RuO2 /carbon-3 wt.% CNT, 20 wt.% RuO2/carbon, carbon-3 wt.% CNT, carbon nanofiber or nanofiber composite electrode are 530, 390, 180, 130 F/g, respecively. The specific capacitance is increased in all cases as the addition of RuO2/CNT, or RuO2, or CNT is added. In the case of only CNT addition, the specific capacitance is enhanced to induce double layer capacitance due to the excellence electrical conductivity and the offer of mesoropores by large molecules of CNT. Also, in the case of only RuO2 addition, the specific capacitance is improved due to the synergic effect of pseudocapacitance. Addition of both RuO2 and CNT leads to the very high specific capacitance because of the combination both double layer and pseudocapacitance. |
