| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 104 === In the first part of the study, nickel cobaltite was grown around the Ni foam using a microwave synthesis. The effect of surfactant, cetyl-trimethyl-ammonium bromide (CTAB), on the morphology of nickel cobaltite was investigated. The as-prepared sample after annealing at 320C was used as the electrode material for electrochemical capacitors. The results indicated that CTAB changed the structure of nickel cobaltite, and subsequently affected the capacitive characteristic of the electrode. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and surface area analyzer revealed the sheet-like structure of nickel cobaltite with high surface area. Capacitive performance of electrodes was investigated by cyclic voltammetry, galvanostatic charge/discharge, and cyclic-life test in 1 M KOH electrolyte. The results revealed that the nickel cobaltite electrode prepared in the presence of 10 mM CTAB exhibited a high specific capacitance of 1679 F g-1 at a current density of 1 A g-1 and capacitance retention was about 80% after 3000 charge/discharge cycles. In the second part of the study, the carbon sphere and nanotube with embedded iron-nickel nanoparticles were deposited on the stainless steel sheet by electrophoretic deposition. The nanotube showed a higher specific surface area than the sphere. The electrochemical test revealed that the nanotube exhibited a high specific capacitance of 568 F g-1 at a charge/discharge current density of 1 A g-1 and capacitance retention of 70% after 3000 charge/discharge cycles.
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