Electrochemical oxidation of ascorbic acid mediated by Bi2O3 microparticles modified glassy carbon electrode.

Citation

Mohammed Zidan, and Tan, Wee Tee and Abdullah, Abdul Halim and Zainal, Zulkarnain and Goh, Joo Kheng (2011) Electrochemical oxidation of ascorbic acid mediated by Bi2O3 microparticles modified glassy carbon electrode. International Journal of Electrochemical Science, 6 (2). pp. 289-300. ISSN 1452-3981

Abstract

Bismuth oxide (Bi2O3) modified glassy carbon electrode (GCE) was fabricated by mechanical attachment. Electrochemical performance of microparticles of Bi2O3/GCE shows excellent electrooxidation of ascorbic acid (AA) in 0.1M KH2PO4 using cyclic voltammetry. The effect of Bi2O3/GCE is evident by the observation of high peak oxidation current of AA, showing an increase of 2 folds as compared to bare GCE. The detection limit of this modified electrode was found to be 8.1 × 10-6M. Hydrodynamic method (RDE) was used to determine the diffusion coefficient and rate constant of AA with values of 5.4 × 10-6 cm2s-1 and 2.7x10-3 cms-1 for unmodified electrode, while the values of 6.2x10-6 cm2s-1 and 2.3x10-3 cms-1 for GCE modified with Bi2O3, respectively.

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Additional Metadata

Item Type:	Article
Divisions:	Faculty of Science
Publisher:	Electrochemical Science Group
Keywords:	Ascorbic acid; Bi2O3 microparticles; Current enhancement; Cyclic voltammetry; Modified GC electrode.
Depositing User:	Nur Farahin Ramli
Date Deposited:	17 Mar 2014 02:37
Last Modified:	19 Oct 2015 23:37
URI:	http://psasir.upm.edu.my/id/eprint/24775
Statistic Details:	View Download Statistic

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