Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/49599
Title: Studies of Cobalt and Iron Oxides/Oxyhydroxides Nanostructures for Electrochemical Applications
Authors: LEE KIAN KEAT
Keywords: cobalt oxides, iron oxides, nanomaterials, nanostructures, electrochemical capacitors, electrochemical sensors.
Issue Date: 26-Jul-2013
Source: LEE KIAN KEAT (2013-07-26). Studies of Cobalt and Iron Oxides/Oxyhydroxides Nanostructures for Electrochemical Applications. ScholarBank@NUS Repository.
Abstract: CoOOH nanosheet arrays were prepared by simply oxidizing cobalt foil in alkaline medium. A conversion of CoOOH nanosheets to Co3O4 nanosheets was performed and characterized. Comparative electrochemical studies revealed that CoOOH electrode exhibited significantly better electrochemical capacitance and rate capability than Co3O4 electrode. CoOOH electrode was applied as electrochemical sensors to detect glucose, hydrogen peroxide and hydrazine. A novel nanocomposite was fabricated by coupling a-Fe2O3 nanotubes and reduced graphene oxide. Several synergistic effects desirable for electrochemical capacitors were attributed to the intimate coupling of the two components. Iron (III) oxyhydroxide/oxide nanosheets were prepared on iron foil by wet oxidation. The electrode exhibited a higher areal capacitance in Na2SO3 and Na2SO4. Cycling studies revealed the electrode was not stable for prolonged cycling in Na2SO4 and underwent reductive dissolution. The electrode was stable in Na2SO3 for 2000 cycles and exhibited high areal capacitance of 0.3-0.4 F/cm2.
URI: http://scholarbank.nus.edu.sg/handle/10635/49599
Appears in Collections:Ph.D Theses (Open)

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