R. Thangamuthu

Electrocatalytic Behavior of Mixed-Valent RuO ∕ Ru ( CN ) 6 4 − ∕ SiMo12O40 4 − Hybrid Film Modified Electrodes Toward Oxidation of Neurotransmitters and Iodate Reduction

Mixed-valent ruthenium oxide/hexacyanoruthenate/silicomolybdate (RuO/Ru(CN)4-6/SiMo 12 O4-40) hybrid film was grown on glassy carbon electrode by repetitive cyclic voltammetric scanning in H 2 SO 4 solution (pH 1.5) containing Ru 3+ , Ru(CN)4-6 and SiMo 12 O4-40 ions. Simultaneous cyclic voltammetry and electrochemical quartz crystal microbalance measurements demonstrate the steady growth of hybrid film. In pure supporting electrolyte, the modified electrode exhibits five obvious redox couples. The electrochemical responses of modified electrode resemble that of a surface immobilized redox couple. The hybrid film electrodes showed electrocatalytic activity toward oxidation of neurotransmitters, ascorbic acid and reduction of IO-3. The neurotransmitters oxidized on modified electrode at less positive potentials compared to bare electrode. The feasibility of using our modified electrodes for analytical application was also investigated.