Journal
CURRENT APPLIED PHYSICS
Volume 12, Issue 1, Pages 341-345Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2011.07.029
Keywords
Supercapacitor; alpha-Cobalt hydroxide; Mesoporous layered structure; gamma-Ray irradiation
Funding
- cooperative RD Program [B551179-10-01-00]
- Korea Research Council Industrial Science and Technology
- Ministry of Knowledge Economy of Korea [M2009010025]
- Korean Ministry of Education, Science and Technology
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alpha-Cobalt hydroxide is synthesized through a novel radiation-induced route using a cobalt nitrate hexahydrate isopropanol solution by irradiating Co-60 gamma-rays. The as-prepared product shows a layer-structured mesoporous morphology with an average size of 250 nm. Crystalline property analysis exhibits the presence alpha-Co(OH)(2) as a predominant phase with a tiny amount of secondary phases of beta-Co(OH)(2) and CoO. X-ray photoelectron spectroscopy discloses the existence of Co as Co(OH)(2) and CoO with a stoichiometric ratio of 76.7:23.3. In addition, the supercapacitive properties of the product are investigated using cyclic voltammetry and impedance spectroscopy in 1M KOH aqueous solution, showing a maximum capacitance value of 246.7 F g (1) at a scan rate of 5 mV s (1). (C) 2011 Elsevier B. V. All rights reserved.
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