Electrophoresis of Carbon Nanostructures onto Transparent Conducting Oxide Electrodes for Electrochemical Capacitors

• Main Authors: Jun-Wei Shih, 施竣為
• Other Authors: Chien-Te Hsieh
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/70391517430208901249

碩士 === 元智大學 === 化學工程與材料科學學系 === 103 === This target of this thesis is to deposit different carbon materials onto transparent conducting oxide (TCO) substrates as electrode materials for electrochemical capacitors (ECs). An efficient electrophoretic method is adopted to fabricate various dimensional textures including carbon nanoparticle (CNP), carbon nanotubes (CNTs), and graphene nanosheets (GN). The first task of this thesis is to select an appropriate solvent to avoid any poor dispersion and fast sedimentation during the electrophoresis process. A series of experiments has been done to find out an optimal combination between carbon and solvent. Herein isopropyl alcohol is picked up for uniform carbon deposition, whereas the presence of water would result in an oxidation of TCO substrates. Electrochemical behavior of the ECs equipped with different carbons has been systematically investigated, using cyclic voltammetry and ac impedance spectroscopy. To inspect the effect of ionic diffusion, the electrochemical measurements were performed in 0.01M sulfuric acid, lithium sulfate, sodium sulfate, and potassium sulfate electrolytes. Experimental results reveal that the ECs in lithium sulfate exhibit high specific capacitance, high diffusion coefficient, and low inner resistance. Keywords: Transparent conductive oxide electrodes, Electrochemical capacitors,Nano carbon, Graphene, Ion diffusion