Kandasamy N, Venugopal T, Kannan K
Department of Chemistry, Government College of Engineering, Salem 636011, Tamilnadu, India.
J Nanosci Nanotechnol. 2018 Jun 1;18(6):3960-3968. doi: 10.1166/jnn.2018.15187.
A flower like cobalt oxide nanostructured thin film (Co2O3) on Nickel (Ni) plate as have been successfully developed via alcoholic Seed Layer assisted chemical bath Deposition (SLD) process. Through the controlled alkaline electrolytes, the flower and paddles like Co2O3 nanoarchitectures were formed. The prepared thin film was characterized by X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray (SEM and EDX), Atomic Force Microscope (AFM), Raman spectroscopy techniques. Electron micrograph reveals the flower and paddles like nanostructured Co2O3 thin film deposited on Ni plates. The electrochemical characteristics were investigated using cyclic voltammetry (CV), charge-discharge and AC impedance spectroscopy in different aqueous electrolytes such as NaOH, KOH, and LiOH. The maximum specific capacitance of 856 Fg-1 was attained with 2 M KOH electrolyte with 2 mVs-1 of the Co2O3 thin film coated Ni plate at 80 °C using SLD method. The capacitance values obtained with various electrolytes are in the order of KOH > NaOH > LiOH. The results indicate that the present method is economical and the material is ecofriendly with enhanced capacitance property.
通过酒精种子层辅助化学浴沉积（SLD）工艺，已成功在镍（Ni）板上制备出一种花状氧化钴纳米结构薄膜（Co2O3）。通过控制碱性电解质，形成了花状和桨状的Co2O3纳米结构。采用X射线衍射（XRD）、带能谱的扫描电子显微镜（SEM和EDX）、原子力显微镜（AFM）、拉曼光谱技术对制备的薄膜进行了表征。电子显微镜照片显示了沉积在镍板上的花状和桨状纳米结构Co2O3薄膜。在不同的水性电解质如NaOH、KOH和LiOH中，使用循环伏安法（CV）、充放电和交流阻抗谱研究了其电化学特性。采用SLD方法，在80℃下，2 M KOH电解质中，Co2O3薄膜包覆的镍板在2 mV s-1时获得了856 F g-1的最大比电容。不同电解质获得的电容值顺序为KOH＞NaOH＞LiOH。结果表明，该方法经济，材料环保，电容性能增强。
