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Electrocatalytic oxidation of ascorbic acid mediated by lithium doped microparticles Bi2O3/MWCNT modified glassy carbon electrode


Citation

Zidan, Mohammed and Tan, Wee Tee and Zainal, Zulkarnain and Abdullah, Abdul Halim and Goh, Joo Kheng (2010) Electrocatalytic oxidation of ascorbic acid mediated by lithium doped microparticles Bi2O3/MWCNT modified glassy carbon electrode. International Journal of Electrochemical Science, 5 (4). pp. 501-508. ISSN 1452-3981

Abstract

Use of a lithium doped Bismuth oxide and MWCNT modified glassy carbon electrode (Bi2O3/Li+/CNT/GC) enhance the oxidation current of ascorbic acid during cyclic voltammetry compared to bare GC and (Bi2O3 /Li+/ CNT) modified electrode. Peak potential was observed to shift slightly to less positive value by about 220 mV and current was significantly enhanced by about two folds. The sensitivity under conditions of cyclic voltammetry is significantly dependent on pH, temperature, electrolyte and scan rate. The result of scanning electron micrograph shows that the size increased slightly by < 1 μm after electrolysis using Bi2O3 /Li+/ CNT modified electrode. The detection limit of this modified electrode was found to be 50μM. The oxidation current of ascorbic acid decreased slightly after the first cycle and became stable with minor decreases after second cycle. It is therefore evident that the Bi2O3/CNT modified GC electrode possesses some degree of stability. Potential use of Bi2O3/CNT as a useful electrode material is therefore clearly evident.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Electrochemical Science Group
Keywords: Electrocataysis; Bi2O3/MWCNT composite; Modified GCE; Ascorbic acid; Cyclic voltammetry
Depositing User: Nabilah Mustapa
Date Deposited: 08 Apr 2019 08:49
Last Modified: 08 Apr 2019 08:49
URI: http://psasir.upm.edu.my/id/eprint/14458
Statistic Details: View Download Statistic

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