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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5815

Title: Probing the electrochemical behaviour of SWCNT-cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions
Authors: Adekunle, AS
Pillay, J
Ozoemena, KI
Keywords: Single-walled carbon nanotubes
Cobalt nanoparticles
Electron transfer behaviour
Impedance spectroscopy
Adsorption
Nitrite detection
Issue Date: May-2010
Publisher: Elsevier
Citation: Adekunle, AS, Pillay, J and Ozoemena, KI. 2010. Probing the electrochemical behaviour of SWCNT-cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions. Electrochimica Acta, vol. 55(14), pp 4319-4327
Series/Report no.: Workflow;6132
Abstract: The electrochemical decoration of edge plane pyrolytic graphite electrode (EPPGE) with cobalt and cobalt oxide nanoparticles integrated with and without single-walled carbon nanotubes (SWCNTs) is described. Successful modification of the electrodes was confirmed by field emission scanning electron microscopy (FESEM), AFM and EDX techniques. The electron transfer behavior of the modified electrodes was investigated in [Fe (CN)6]3-/4- redox probe using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) and discussed. The study showed that cobalt nanoparticles modified electrodes exhibit faster electron transfer behaviour than their oxides. The catalytic rate constant (K) obtained at the EPPGE–SWCNT–Co for nitrite at pH7.4 and 3.0 are approximately the same (~3×104 cm3 mol-1 s-1) while the limits of detection (LoD = 3.3d/m) are in the µM order. From the adsorption stripping voltammetry, the electrochemical adsorption equilibrium constant ß was estimated as (13.0±0.1)×103M-1 at pH 7.4 and (56.7±0.1)×103M-1 at pH 3.0 while the free energy change ( G ) due to the adsorption was estimated as -6.36 and -10.00 kJ mol-1 for nitrite at pH 7.4 and 3.0, respectively.
Description: Copyright: 2009 Elsevier. This is an ABSTRACT ONLY.
URI: http://www.sciencedirect.com/science/article/pii/S001346860900365X
http://hdl.handle.net/10204/5815
ISSN: 0013-4686
Appears in Collections:Analytical science
General science, engineering & technology

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