| Summary: | 碩士 === 國立交通大學 === 應用化學系碩博士班 === 106 === On three-dimensional (3D) fabric synthesis, a bottom-up strategy for growth of 3D carbon nanocoils (CNCs) frameworks facilitated by Au/K binary catalysts via in-situ deposition. The generation of 3D CNCs networks effectively rendering the extraordinary 1D characteristics directly on carbon fiber clothes. A system of methodology offers a conduit to achieve in-situ catalysis deposition via Au nanoparticles from HAuCl4 reduction and the increase of contacting area with vapor K. By using a three-electrode system, the electrochemical active surface area was determined referring to Randles-Sevcik equation. The CNC-based electrode exhibited almost three times surface area (16.53 cm2) as large as original substrate owned (5.84 cm2). In terms of resistance, the relative minimums were observed because of CNCs provide multitudinous accessible routes for electrolyte transportation. To comprehensively investigate, both liquid- and solid-state sets were applied by using two-electrode system. Both devices exhibited nearly rectangular shape profiles in CV measurements at various scan rates, indicating ideal double-layer capacitive behavior. From Galvanostatic charge/discharge (GCD) curves, the specific capacitance of CNC-based supercapacitors (CNC-based SC) in liquid- and solid-state system were measured to be approximately 137 F/g and 134 F/g, respectively. In addition, the solid-state CNC-based SC possessed excellent energy density (18.6 Wh/kg) and power density (500 W/kg). A bendable carbon fiber clothes was introduced to serve as subtract, then a light (0.1965 g) and high flexibility supercapacitor could be realized. These suggested that the material will be an excellent candidate for energy storage systems in wearable devices and other applications.
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