Adekunle, ASMamba, BBAgboola, BOOzoemena, KI2012-05-162012-05-162011-09Adekunle, 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 4388-44031452-3981http://www.electrochemsci.org/papers/vol6/6094388.pdfhttp://hdl.handle.net/10204/5865Copyright: 2011 ESGNitrite, 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.enSingle-walled carbon nanotubesEdge plane pyrolytic graphite electrodePrussian blue nanoparticlesOxidationNitriteAdsorptionArticleAdekunle, A., Mamba, B., Agboola, B., & Ozoemena, K. (2011). Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode. http://hdl.handle.net/10204/5865Adekunle, AS, BB Mamba, BO Agboola, and KI Ozoemena "Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode." (2011) http://hdl.handle.net/10204/5865Adekunle A, Mamba B, Agboola B, Ozoemena K. Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode. 2011; http://hdl.handle.net/10204/5865.TY - Article AU - Adekunle, AS AU - Mamba, BB AU - Agboola, BO AU - Ozoemena, KI AB - 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. DA - 2011-09 DB - ResearchSpace DP - CSIR KW - Single-walled carbon nanotubes KW - Edge plane pyrolytic graphite electrode KW - Prussian blue nanoparticles KW - Oxidation KW - Nitrite KW - Adsorption LK - https://researchspace.csir.co.za PY - 2011 SM - 1452-3981 T1 - Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode TI - Nitrite electrochemical sensor based on prussian blue/single-walled carbon nanotubes modified pyrolytic graphite electrode UR - http://hdl.handle.net/10204/5865 ER -