Electrochemical oxidation of ascorbic acid mediated by Bi(2)O(3) microparticles modified glassy carbon electrode

Zidan Mohammed, Wee Tan, Abdul Halim Abdullah, Zulkarnain Zainal, Joo Kheng Goh

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    24 Citations (Scopus)

    Abstract

    Bismuth oxide (Bi(2)O(3)) modified glassy carbon electrode (GCE) was fabricated by mechanical attachment. Electrochemical performance of microparticles of Bi(2)O(3)/GCE shows e x cellent electrooxidation of ascorbic acid (AA) in 0.1M KH(2)PO(4) using cyclic voltammetry. The effect of Bi(2)O(3)/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 x 10(-6) M. Hydrodynamic method (RDE) was used to determine the diffusion coefficient and rate constant of AA with values of 5.4 x 10(-6) cm(2)s(-1) and 2.7 x 10(-3) cm s(-1) for unmodified electrode, while the values of 6.2 x 10(-6) cm(2) s(-1) and 2.3 x 10(-3) cm s(-1) for GCE modified with Bi(2)O(3), respectively.
    Original languageEnglish
    Pages (from-to)289 - 300
    Number of pages12
    JournalInternational Journal of Electrochemical Science
    Volume6
    Issue number2
    Publication statusPublished - 2011

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