Preparation and Capacitive Characteristics of Ruthenium Oxide/Few Layer Graphene Hybrid Electrodes for Supercapacitor Application
| Autor: | Yi-Liang Chen, 陳奕良 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 In this study, tantalum pentoxide (Ta2O5)-ruthenium oxide (RuO2)/few layer graphene (FLG)/titanium foil (Ti)/sulfuric acid (H2SO4)/Ta2O5-RuO2/FLG/Ti symmetry supercapacitor (Ta2O5-RuO2 /FLG-SC) were fabricated by using sandwich assembling technique, where Ta2O5- RuO2/FLG/Ti, H2SO4 behaved as the bipolar hybrid electrode and liquid electrolyte, respectively. Ta2O5-RuO2/FLG/Ti hybrid electrodes were further prepared by dipping Ti foil in the TaCl3-RuCl3-FLG bath with different concentrations. Result showed that the synthesized FLG exhibits a transparent with some folded morphologies, the thickness of synthesized FLG is ca. 1~ 3 nm, which is prepared FLG possesses 3~10 layers caused by the Van der Waals force. As for Raman spectroscopy analysis, G-band intensity is decreased after the reduction of graphene oxide, which is attributed to the increase in graphene edges fraction. Without TaCl5, the deposited amount of RuO2 on Ti with increasing the drawing rate, but the deposited layer of RuO2 reveals an extreme uniform characteristic. In the presence of TaCl5, the uniform characteristic of RuO2 deposited layer can be significantly improved. When TaCl3/RuCl3 molar ratio is 0.6, drawing rate is 14.3 mm/s, Ta2O5-RuO2 layer is successfully deposited, which exhibits the best uniform characteristic. In the presence of FLG, Ta2O5-RuO2/FLG -SCs show lower resistance and leakage current, the cycle stability is also significantly improved. At 30 wt.% of FLG, dipping for three times, Ta2O5-RuO2/FLG-SCs show the best capacitance performance, the energy density and power density are 12.72 Wh/kg and 262kW/kg, respectively. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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