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Voltammetric detection of potassium ferricyanide mediated by multi walled carbon nanotube titanium dioxide composite modified glassy carbon electrode.


Citation

Perenlei, Ganchimeg and Tan, Wee Tee and Yusof, Nor Azah and Goh, Joo Kheng (2011) Voltammetric detection of potassium ferricyanide mediated by multi walled carbon nanotube titanium dioxide composite modified glassy carbon electrode. International Journal of Electrochemical Science, 6 (2). pp. 520-531. ISSN 1452-3981

Abstract

The MWCNT/TiO2 composite was homogeneously coated on the surface of GCE and applied in the electrochemical determination of 0.1 mM potassium ferricyanide in 0.1 M Na2HPO4 (pH 8.5). The redox couple of potassium ferricyanide with current enhancements of 3.0-3.1 folds was obtained using the MWCNT/TiO2/GCE when compared with unmodified GCE. A linear calibration plot showed a correlation coefficient of 0.999, with detection limits of 48.6 μM (100 mV/s scan rate) and 1.1 μM (5 mV/s scan rate) in the concentration ranges of 0.01-0.2 mM of potassium ferricyanide. High sensitivity responses of 77.6 µA/mM for the anodic and of 68.9 µA/mM for the cathodic peak currents were also obtained with an excellent correlation coefficient of 0.999. Based on plot of peak current against peak potential, the zero-current potentials were obtained as =209 mV and =189 mV. Diffusion coefficient was found as 1.52x10-5cm 2/s from chronocoulometry study. The effect of temperature study was carried at 10 oC – 80oC and activation energy obtained was 5.8-6 kJ/mol. The morphology of composite surface was examined by scanning electron microscopy.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Electrochemical Science Group
Keywords: Multi-walled carbon nanotubes; Titanium dioxide; Modified electrode; Potassium ferricyanide; Cyclic voltammetry.
Depositing User: Nur Farahin Ramli
Date Deposited: 17 Mar 2014 02:04
Last Modified: 28 Oct 2015 08:59
URI: http://psasir.upm.edu.my/id/eprint/24773
Statistic Details: View Download Statistic

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