Pseudocapacitive performance of vertical copper oxide nanoflakes
Document Type
Article
Publication Date
1-1-2012
Abstract
Vertical copper oxide (CuO) nanoflakes have been formed by oxidation in NaOH solution. Their structural, surface morphology and oxidation states were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS) respectively. Pseudocapacitive behavior of CuO nanoflakes was investigated by cyclic voltammetry and constant current charge-discharge test. CuO nanoflakes were vertically grown with high lateral aspect ratio and consist of monoclinic lattice as shown by the presence of two peaks close to 2θ = 35.6 o and 38.7 o in the XRD. Charge-discharge test gave a capacitance value of 190 F g - 1 in 1.0 M KOH electrolyte at 2 mA cm - 2 current density. The cycling test showed 67% stability after 2000 cycles and reduced specific capacitance from 190 F g - 1 to 125 F g - 1. Specific capacitance of CuO nanoflakes is higher than 26.44 F g - 1 of globular CuO at 2 mA cm - 2 as reported in literature due to enhanced specific surface area. Crown Copyright © 2012.
Keywords
Copper oxide, Nanoflakes, Supercapacitor
Divisions
CHEMISTRY
Publication Title
Thin Solid Films
Volume
528
Publisher
Elsevier
Additional Information
Department of Chemistry, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA