奈米碳管/鈷氧化物複合電極材料於超高電容器之應用研究

Abstract

超級電容是一種具有高比電容值、高功率密度、快速充放電、可靠性高以及循環壽命長等特性的儲能元件。近年來，具備高比表面積及多孔性之複合材料應用於超級電容上已被廣泛的研究。 本論文實驗過程中，初始先以水熱法合成奈米碳管/鈷氧化物複合材料，後續搭配電泳法使表面帶有正電荷之複合材料沉積於鎳基板上。製程中調整水熱前驅液濃度、反應時間及退火處理等實驗參數，進而找出最佳化製程條件，將奈米碳管/鈷氧化物複合材料應用於超級電容之研究。實驗結果顯示，在硝酸鈷前驅液2 mmol、水熱反應時間8小時及溫度180 oC之水熱條件下，所合成之奈米碳管/鈷氧化物複合材料具備有高比表面積之多孔性結構，其應用於超級電容器，具有高比電容值 705 F g-1 (3 A g-1) 及優異的循環壽命。

Supercapacitors are an energy storage device with high specific capacitance, high power density, quick charge/discharge time, long cycle life, and excellent cycle stability. In recent years, nanocomposites materials possess high specific surface and porous structure applied to serve as supercapacitor have been widely researched. In this thesis, we introduce the experiment process. First of all, the production of Co3O4/CNTs nanocomposites are synthesized by hydrothermal method. Next, the electrophoresis deposition method is used to deposit nanocomposites that with positive charge on nickel substrate. By adjusting precursor solution concentration, hydrothermal time, and annealing temperature in the process, we can find the optimized process condition and apply the Co3O4/CNTs nanocomposites to the research of supercapacitor. As the experimental results, in the hydrothermal condition of the cobalt nitrate precursor concentration 2 mmol, hydrothermal time 8 h, and hydrothermal temperature 180 oC, the synthesized Co3O4/CNTs nanocomposites have high specific capacitance (705 F g-1 at 3 A g-1) and excellent cycle stability.