Supercapacitive activities of potentiodynamically deposited nanoflakes of cobalt oxide (Co3O4) thin film electrode.

Autor: Jagadale AD; Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur, MS, India., Kumbhar VS, Lokhande CD
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2013 Sep 15; Vol. 406, pp. 225-30. Date of Electronic Publication: 2013 May 31.
DOI: 10.1016/j.jcis.2013.05.037
Abstrakt: In the present work, the Co3O4 thin films are successfully prepared via potentiodynamic electrodeposition method onto inexpensive stainless steel substrate. As-deposited films were heat treated at 623K for their conversion into Co3O4. These films were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) techniques. The X-ray diffraction (XRD) study revealed the formation of cobalt oxide (Co3O4) with cubic crystal structure. The FT-IR study supports the formation of Co3O4 material. The SEM image of Co3O4 film showed nanoflake-like morphology with an average thickness of 100 nm. Supercapacitive properties of Co3O4 thin film electrode were examined using cyclic voltammetry and charge-discharge techniques. The Co3O4 thin film electrode showed maximum specific capacitance of 365 Fg(-1) in 1M KOH electrolyte at the scan rate of 5 mV s(-1). The charge-discharge technique was employed to estimate the values of specific energy, power and coulombic efficiency as 64 W h kg(-1), 21.53 kW kg(-1) and 99%, respectively.
(Copyright © 2013 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: