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- Title
Preparation and electrochemical performances of nanoporous/cracked cobalt oxide layer for supercapacitors.
- Authors
Gobal, Fereydoon; Faraji, Masoud
- Abstract
Nanoporous/cracked structures of cobalt oxide (CoO) electrodes were successfully fabricated by electroplating of zinc-cobalt onto previously formed TiO nanotubes by anodizing of titanium, leaching of zinc in a concentrated alkaline solution and followed by drying and annealing at 400 °C. The structure and morphology of the obtained CoO electrodes were characterized by X-ray diffraction, EDX analysis and scanning electron microscopy. The results showed that the obtained CoO electrodes were composed of the nanoporous/cracked structures with an average pore size of about 100 nm. The electrochemical capacitive behaviors of the nanoporous CoO electrodes were investigated by cyclic voltammetry, galvanostatic charge-discharge studies and electrochemical impedance spectroscopy in 1 M NaOH solution. The electrochemical data demonstrated that the electrodes display good capacitive behavior with a specific capacitance of 430 F g at a current density of 1.0 A g and specific capacitance retention of ca. 80 % after 10 days of being used in electrochemical experiments, indicating to be promising electroactive materials for supercapacitors. Furthermore, in comparison with electrodes prepared by simple cathodic deposition of cobalt onto TiO nanotubes(without dealloying procedure), the impedance studies showed improved performances likely due to nanoporous/cracked structures of electrodes fabricated by dealloying of zinc, which provide fast ion and electron transfer routes and large reaction surface area with the ensued fast reaction kinetics.
- Subjects
COBALT oxides; NANOPOROUS materials; SURFACE cracks; SUPERCAPACITORS; ELECTROCHEMISTRY; ELECTROPLATING; SCANNING electron microscopy
- Publication
Applied Physics A: Materials Science & Processing, 2014, Vol 117, Issue 4, p2087
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-014-8623-9