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Vol. 104, Issue 5, April 2009, pp.119-127





Electrochemical Reduction of Potassium Ferricyanide Mediated by Magnesium Diboride Modified Carbon Electrode


*WeeTee TAN, FARHAN Yusri and ZULKARNAIN Zainal

Department of Chemistry, Faculty of Science, Universiti Putra Malaysia,

43400 UPM, Serdang, Selangor D.E., Malaysia

E-mail: wttan@science.upm.edu.my



Received: 10 February 2009   /Accepted: 19 May 2009   /Published: 25 May 2009


Abstract: Use of a glassy carbon (GC) modified by adhered microparticles of MgB2 mediates the reduction process of Fe(III)(CN)63- during cyclic voltammetry. Peak potential was observed to shift slightly to less negative value by about 50 mV and current is significantly enhanced by about two folds. The sensitivity under conditions of cyclic voltammetry is significantly dependent on pH, electrolyte and scan rate. The result of scanning electron micrograph of MgB2 obtained before and after electrolysis show the size increased slightly to the size ranging from 2 - 5.5 m attributing to the hydration effect and/or incorporation of some ionic species into the crystal lattices of MgB2. Interestingly, redox reaction of Fe(III) solution using modified GC electrode remain constant even after 15 cycling. It is therefore evident that the MgB2 modified GC electrode posseses some degree of stability. Potential use of MgB2 as a useful electrode material is therefore clearly evident.


Keywords: Solid state voltametry of microparticles, MgB2 modified GC electrode, Fe(III)/(II) redox couple, Electrocatalysis


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