| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 106 === Among many energy storage devices, supercapacitors are devices with high charge and discharge efficiency, high power density, and high cycle life. On the electrode material, graphene has excellent thermal conductivity, electrical conductivity and high specific surface area, which has become one of the most popular materials for super capacitor research. However, graphene itself has the property of self-aggregation and interface resistance, resulting in a decrease in its specific surface area, which makes it unable to exhibit excellent capacitance performance. As a result, the application of graphene to supercapacitors is still one of the main reasons for academic research and commercialization. In this study, the nanocomposites of amorphous manganese oxide/graphene/carbon nanotubes were synthesized by hydrothermal synthesis method using polyol reduction method. The use of manganese oxide to adhere the carbon nanotubes to the graphene, to avoid the phenomenon of its own aggregation, to provide better pore and interface properties to maximize the contact of the electrolyte and the material, increase the specific capacitance. In the 1 M Na2SO4 electrolyte, excellent specific capacitance (210F/g) characteristics are exhibited; at a current of 1 A/g, the specific capacitance of all components can reach 33 F/g. The results show that the amorphous manganese oxide/graphene/carbon nanotubes developed by the institute are potential capacitive materials and help to break through the bottleneck of the commercial application of graphene in supercapacitors.
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