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.
|Pages (from-to)||289 - 300|
|Number of pages||12|
|Journal||International Journal of Electrochemical Science|
|Publication status||Published - 2011|
Mohammed, Z., Tan, W., Abdullah, A. H., Zainal, Z., & Goh, J. K. (2011). Electrochemical oxidation of ascorbic acid mediated by Bi(2)O(3) microparticles modified glassy carbon electrode. International Journal of Electrochemical Science, 6(2), 289 - 300.