| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 98 === Poly(3,4-ethylenedioxythiophene)(PEDOT) has the larger reversible oxidation-reduction potential than other conducting polymers. According to this advantage, the potential window, specific energy and specific power of supercapacitor could be increase. Combination with PEDOT and anode materials as asymmetric supercapacitor could get wider cell voltage then symmetric conducting polymer supercapacitor.
We had successfully synthesized the direct-grown PEDOT nanowires on carbon cloth by electrochemical polymerization. The 2 cycles of cyclic voltammogram at scan rate 10 mV/s, and then used galvanostatic to growth 5 minutes at 1 mA were operated to fabricated PEDOT nanowires. From SEM, the diameter of PEDOT nanowires was around 60 nm. Compare with PEDOT film, PEDOT nanowires exhibited high surface area and short diffusion distance. The specific capacitance of PEDOT nanowires electrode were 321.1 Fg-1 in 1 M H2SO4.
Because of the high surface area, good electrical properties and low internal resistance, the direct-grown carbon nanotubes on carbon cloth was utilized as substrate to raise the power density and energy density. Under the condition of cyclic voltammogram scan (100 mV/s, 20 cycles), PEDOT can be uniformly coated on carbon nanotubes to form PEDOT-CNTs/CC core/shell nanocomposite. From SEM, the diameter of PEDOT-CNTs was 167.2 nm. Furthermore, the specific power and energy of the composite electrode could be increase to 31.5 kWkg-1 and 138.3 Whkg-1 in neutral electrolyte, and its specific capacitance was 486.5 Fg-1 in acidic electrolyte.
Finally, we combine PEDOT with anode materials (PANI and MnO2) as asymmetric supercapacitor. The cell voltage could be extended to 1.4 V and 2.0 V.
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