| Summary: | 博士 === 逢甲大學 === 環境工程與科學學系 === 107 === Abstract
Supercapacitors have been relatives of energy storage devices, which is the conversion of the electrical energy from sustainable energy sources of solar, wind energy and so on. They differentiate from another family of energy storage devices like Li, Na and K ion batteries, for instance, batteries are able to full charging take time meanwhile discharging in seconds. The overall supercapacitor performances of developing electrode materials have been relying on the outstanding electrical conductivity, porous nanostructures with excellent long-term stability and larger surface areas. These properties are attractive and extensive research efforts to move on one-step forward to developing the supercapacitor performances. The scope of this dissertation to design and synthesis of bismuth and molybdenum-based electrode materials, with their application of supercapacitor. Bismuth-based electrode materials, the increasing loading amount of RGO nanosheets to improve the electrical conductivity on Bi2O2CO3 electrode materials at three-electrode configuration. In addition, the anode of Bi2O3/porous-RGO nanosheet has been prepared with the help of catalytic carbon gasification method and then combine with cathode materials of α-MnO2 to exhibits high energy/power density at two-electrode configuration. Molybdenum-based electrode materials, the hexagonal-MoO3 nanoplates have been create the high amount of oxygen vacancy concentration in crystal lattice at high annealing temperature and thereby interlayer distance increases and enhance the electrical conductivity. The highest oxygen vacancy concentration of hexagonal-MoO3 nanoplates is generated the crystal defects in the presence of NH4+ ions such as grain and twin boundaries, amorphous and screw dislocation. This crystal defects to produce the diffusion path for electrolyte ions easily move on the electrode surface and thus improve the charge storage performances. Furthermore, the hetero-atoms of nitrogen doped hallow carbon nanotubes are augmented the electrical conductivity of molybdenum oxy-carbide nanoparticles in acidic condition. The above our synthesized bismuth and molybdenum-based nanostructured electrode materials to make new insight for future work of asymmetric supercapacitor fabrication techniques.
Keywords: Porous-RGO, Bismuth, Molybdenum, Crystal defects, Electrical conductivity
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