用於對稱超級電容器之氧化鈷奈米線化學合成

Abstract

中文摘要 超級電容因其功率密度高於其他能量儲存設備，例如：鋰離子電池，所以適用在各種需要高功率突發的應用上，然其能量密度低於鋰離子電池與燃料電池等儲能器，因而限制了其實際應用之可能性。為了能簡化且實際探討超級電容之應用，本研究利用簡單的化學浴沉積法於基材上成長具有高理論電容、低成本、良好的氧化還原能力以及對環境友善性的四氧化三鈷奈米線。此外，也會針對此奈米異質結構進行分析相關的材料特性及電化學特性。 本研究結果四氧化三鈷奈米線具有66.33 mg-1的高比表面積，此結構有利於電解質離子的嵌入和電子傳輸，高比表面機提供了更多電荷儲存。以及掃描速率5 mVs-1下850 Fg-1的優異比電容值，且超過5000次循環時電容保留率86％的長期循環穩定性。且基板的選擇避免了黏合劑造成的界面缺陷、生長不均。

Abstract Because of its higher power density than other energy storage devices, such as lithium-ion batteries, supercapacitors are suitable for applications requiring high power bursts, but their energy density is lower than that of lithium-ion batteries and fuel cells. Limits the possibility of its practical application. In order to simplify and practically explore the application of supercapacitors, this study used a simple chemical bath deposition method to grow a high theoretical volume, low cost, good redox capacity and environmentally friendly cobalt trioxide nanowire on the substrate. In addition, the material properties and electrochemical properties associated with this nanostructure are also analyzed. The results of this study have a high specific surface area of 66.33 mg-1, which is beneficial to the insertion and electron transport of electrolyte ions, and the high specific surface machine provides more charge storage. And the excellent specific capacitance value of 850 Fg-1 at a scan rate of 5 mVs-1, and the long-term cycle stability of the capacitor retention rate of 86% over 5000 cycles. Moreover, the selection of the substrate avoids interface defects and uneven growth caused by the adhesive.