硫化钴多孔疏松纳米针束阵列超级电容器电极材料在泡沫镍基底上的原位合成及电化学性能研究

在导电泡沫镍基底上通过一种简便的离子交换反应原位合成出了硫化钴多孔疏松纳米针束阵列并直接用作超级电容器的电极。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等手段对其结构和形貌进行了详细的表征。同时运用循环伏安(CV)、计时电位分析(CP)、电化学阻抗谱(EIS)等方法对其在3 mol/L KOH电解液中的电化学性能进行了分析,结果表明这种在泡沫镍基底上原位生长出的Co9S8多孔疏松纳米针捆束阵列在4 A·g~(-1)的电流密度下具有高达1400 F·g-1的比电容和优异的循环稳定性能。这种电极材料之所以具有如此优秀的电化学性能,主要归因于Co9S8纳米针捆束阵列的多孔疏松结构与3D泡沫镍基底之间的协同效应可以有效的增加电极材料与电解液之间的接触面积和提高整个电极的导电性。

In-situ Ssynthesis and properties of porous cobalt sulfide nanoneedle bundles arrays on nickel foam as electrodes for supercapacitors

Freestanding porous Co₉S₈ nanoneedle bundles arrays on Ni foam were in-situ synthesized by a facile ion exchange reaction and were directly used as the electrode for supercapacitors. The structure and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). Cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) were adopted to evaluate the electrochemical property of the porous Co₉S₈ nanoneedle bundles arrays electrode in 3M KOH solution. The specific capacitance of the porous Co₉S₈ nanoneedle bundles arrays was 1400 F g_-1 at a current density of 4 A g_-1 and exhibited good cycling stability. The excellent electrochemical performance can be ascribed to the porous nanostructure of Co₉S₈ nanoneedle bundles arrays and the 3D conductive nickel foam, which can increase the contact areas between electrode and electrolyte and improve the conductivity of the whole electrode.