Single-step growth of pyramidally textured NiO nanostructures with improved supercapacitive properties

摘要

Here, we report the fabrication of one step NiO nanopyramid thin film as a binder-free electrode with improved electrochemical properties using a reactive magnetron sputtering. The crystalline nature, surface morphology and chemical composition of the as deposited NiO thin films were analyzed by X-ray diffraction (XRD), Raman spectroscopy, Field emission scanning electron microscopy (FE-SEM), Atomic force microscopy (AFM) and X-ray Photoluminescence spectroscopy (XPS). The electrochemical measurements were carried out using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge (GCD) techniques. NiO nanopyramid nanostructures electrode exhibited high specific capacitance (325 F g(-1) at 0.4 mA cm(-2) in 1 M KOH), high efficient density (19.66 Wh kg(-1)) and power density (2.15 kW kg(-1)) with excellent cycling stability (91.4% retention after 1000 cycles). (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.