Preparation and Characterization of rGO/Bi2O3 Composites by Hydrothermal Synthesis for Supercapacitor Electrode

• Main Authors: LIN, YU-JIANG, 林育江
• Other Authors: YANG, WEIN-DUO
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/p6cq3k

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 105 === In this study, reduced graphene/ bismuth oxide composites were prepared at various weight ratios, GO and bismuth nitrate at 1: 0.1, 1: 0.3, 1: 0.6, 1: 0.9 and 1: 1.2, respectively, by the improved Hummer's method. During the process, the mixed solutions were prepared, then, rGO was obtained by hydrothermal method. Finally, the complex of rGO / Bi2O3 was prepared by calcination after hydrothermal treatment. The results show that the remove of oxygen- containing functional groups in rGO are increase as the increase of graphene agglomeration, and the Raman shifts wave-number of G band tending to the lowest. When the weight ratio of GO to bismuth nitrate at 1: 0.6, the G band wave-number of rGO/Bi2O3 is the highest, and the stripping effect of graphene is the best. The electrochemical characteristics of rGO and rGO/Bi2O3 were also examined in 1 M KOH electrolyte. The results showed that the dominated charge storage mechanism of them are attributed to the electric double layer behaviors. Studied by CV curves, the content of bismuth nitrate is increased, and rGO/Bi2O3 has a higher capacitance. The rGO capacitance is 84.6 F/g, and the rGO/Bi2O3 at 1: 1.2 exhibits a maximum capacitance of 196 F/g at 1 A/g. By EIS analysis, rGO/Bi2O3 shows lower impedance compared to rGO, exhibiting a better capacitance behavior. It reveals rGO/Bi2O3 obtained by hydrothermal synthesis method can be used for the application of carbon-electrode for super capacitor.