硫化钴
超级电容器
循环伏安法
材料科学
介电谱
电极
电解质
电催化剂
化学工程
水平扫描速率
X射线光电子能谱
电化学
扫描电子显微镜
氢氧化钴
纳米颗粒
钴
无机化学
纳米技术
化学
物理化学
工程类
复合材料
冶金
作者
Yedluri Anil Kumar,S. Srinivasa Rao,Dinah Punnoose,Chebrolu Venkata Tulasivarma,Chandu V. V. Muralee Gopi,Kandasamy Prabakar,Hee-Je Kim
摘要
In this study, cobalt sulfide (CoS) electrodes are synthesized using various solvents such as water, ethanol and a combination of the two via a facile chemical bath deposition method on Ni foam. The crystalline nature, chemical states and surface morphology of the prepared CoS nanoparticles are characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transition electron microscopy. The electrochemical properties of CoS electrodes are also evaluated using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. When used as an electrode for a supercapacitor, CoS prepared with ethanol as a solvent exhibits a capacitance of 41.36 F g-1 at 1.5 A g-1, which is significantly better than that prepared using water and water/ethanol-based solvents (31.66 and 18.94 F g-1 at 1.5 A g-1, respectively). This superior capacitance is attributed to the ideal surface morphology of the solvent, which allows for easy diffusion of electrolyte ions into the inner region of the electrode. High electrical conduction enables a high rate capability. These results suggest that CoS nanoparticles are highly promising for energy storage applications as well as photocatalysis, electrocatalysis, water splitting and solar cells, among others. These results show that CoS is a promising positive electrode material for practical supercapacitors.
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