TY - JOUR
T1 - Electrochemical oxidation of ascorbic acid mediated by Bi(2)O(3) microparticles modified glassy carbon electrode
AU - Mohammed, Zidan
AU - Tan, Wee
AU - Abdullah, Abdul Halim
AU - Zainal, Zulkarnain
AU - Goh, Joo Kheng
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
UR - http://www.electrochemsci.org/papers/vol6/6020289.pdf
M3 - Article
VL - 6
SP - 289
EP - 300
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
SN - 1452-3981
IS - 2
ER -