| Summary: | 碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 102 === Growing environmental and energy-supply concerns have led to intense research on various energy storage technologies. Among them, supercapacitor plays a vital role among these technologies, due to its nature of ultra-high power density. In order to improve the energy density, power density, and charge/discharge speed of supercapacitors, the main concepts of this study are to exploit advantages of three different materials: high energy density of transition metal oxides (ex. RuO2); high power density of carbon mesoporous materials (ex. CMK-3) and high conductivity of carbon nanotubes (CNTs) to form a composite electrode.
Here in this study, the crystallization and dispersion of RuO2, the effects of RuO2 mass fraction, charge/discharge rate, and CMK-3/CNTs on energy/power densities were discussed. Microstructures of all the specimens were characterized by scanning electron microscopy (SEM), Inductively coupled plasma-mass spectrometry (ICP-MS), Transmission electron microscopy (TEM), N2 adsorption/desorption isotherm and X-ray diffraction (XRD) measurements. Furthermore, the specific capacitance and the ideal density of energy and power were derived from cyclic voltammetry (CV) method. In short, the addition of RuO2 led to enhanced energy density of 0.16 Wh/g and power density of 37.7 W/g, which are 4 times and 3 times greater than those of CMK-3, respectively, providing an effective route to enhance the capacitance.
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