Journal
RSC ADVANCES
Volume 5, Issue 93, Pages 76458-76463Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra09060a
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Funding
- Institute for Advanced Research in Basic Sciences
- Iran University of Science and Technology
- Iran National Science Foundation [INSF-93012781]
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In a reaction between cobalt(II) and ammonium oxalate in the presence of CTAB or F-127 as surfactant to control the particle size, a cobalt oxalate complex was formed. The precipitate was calcined and the resulting nano cobalt oxide was characterized by Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) methods. The crystalline pure and nano-sized particles had an average size of less than 40 nm. Electrochemical properties were examined by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 351 F g(-1) was obtained at a scan rate of 0.85 A g(-1) in 2 M of KOH solution for Co3O4@Ni foam electrode (Co3O4@NF). Furthermore, the electrode exhibits excellent cycle life stability, and almost 98.6% of its initial specific capacitance was maintained after 1000 cycle tests.
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