| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 106 === As for the increasing demands of environmentally friendly and fast charge/discharge energy storage device, supercapacitor (SC) technologies have been attracting increasing research interests. Among all the supercapacitor technologies, hybrid capacitor gives the most possibility for high power and high energy densities. Hybrid capacitor electrode can be made by a combination of metal oxides and carbon materials. The aim of hybrid combination is to build a supercapacitor with high specific capacitance, power density, energy density, and long cycle life. In this study, copper/ruthenium oxides and multi-walled carbon nanotubes (CuO/RuO2/MWCNT) nanocomposite was synthesized by hydrothermal method. The optimum ratio between CuO and RuO2 was obtained by adjusting the concentration of metal basis. The electrochemical properties were investigated in a three-electrode configuration cell; sample attached on stainless steel plate as the working electrode, platinum wire as the counter electrode and Ag/AgCl electrode as the reference electrode with 3 M ((NH4)2SO4) electrolyte. As the result, the optimum conditions were 12 hours hydrothermal time, and the temperature was maintained at 180 oC. The proposed CuO/RuO2/MWCNT nanocomposite shows the highest specific capacitance of of 462 F/g (current density of 1 A/g) at the percent weight ratio of Cu, Ru and C are 7 %, 24 % and 60 %, respectively.
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