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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5865

Title: Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode
Authors: Adekunle, AS
Mamba, BB
Agboola, BO
Ozoemena, KI
Keywords: Single-walled carbon nanotubes
Edge plane pyrolytic graphite electrode
Prussian blue nanoparticles
Oxidation
Nitrite
Adsorption
Issue Date: Sep-2011
Publisher: ESG
Citation: Adekunle, AS, Mamba, BB, Agboola, BO and Ozoemena, KI. 2011. Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode. International Journal of Electrochemical Science, vol. 6, pp 4388-4403
Series/Report no.: Workflow;8800
Abstract: Nitrite, NO2- (in neutral), and NO (in acidic media) were used as analytical probe to investigate the electrocatalytic properties of Prussian blue nanoparticles (PB) modified edge plane pyrolytic graphite (EPPG) electrode. Results indicate that single-walled carbon nanotubes-Prussian blue hybrid (SWCNT-PB) modified electrode demonstrated greater sensitivity and catalysis towards nitrite compared to PB or a SWCNT modified electrode. The current response of the electrode was reduced in the presence of cetyltrimethylammoniumbromide (CTAB) which was used as a stabilising agent. Electrocatalytic oxidation of nitrite occurred through a simple adsorption controlled electrode reaction. The adsorption equilibrium constant ß and the standard free energy change G0 due to adsorption were 4.35 x 103 M-1s-1 (-20.76 kJmol-1) and 15.0 x 104 M-1s-1 (-29.53 kJmol-1) for nitrite and nitric oxide respectively. Despite the adsorption, the EPPGE-SWCNT-PB electrode showed good stability of greater than 80% in the analytes. The electrode’s limit of detection and catalytic rate constant were 6.26 µM (4.37 x 106 cm3 mol-1 s-1) and 4.9 µM (6.35 x 105 cm3mol-1s-1) for nitrite and nitric oxide respectively. The fabricated electrode is not difficult to prepare and could serve as a potential sensor for nitrite determination in food and environmental samples.
Description: Copyright: 2011 ESG
URI: http://www.electrochemsci.org/papers/vol6/6094388.pdf
http://hdl.handle.net/10204/5865
ISSN: 1452-3981
Appears in Collections:General science, engineering & technology

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