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Cobalt hexacyanoferrate modified microband gold electrode and its electrocatalytic activity for oxidation of NADH
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A stable electroactive thin film of cobalt hexacyanoferrate (CoHCF) was electrochemically deposited on the surface of a microbandgold electrode. The cyclic voltammograms of CoHCF film indicate the presence of two redox peaks corresponding to the hexacyanofer-rate(ll/lII) redox couple. The electrochemical behaviour of CoHCF is related to the concentration of supporting electrolyte andcounter-ions. The modified electrode shows excellent electrocatalytic activity towards the oxidation of reduced nicotinamide adeninedinucleotide (NADH) in phosphate buffer solution (pH 7.0), with an overpotential ca.310-370 mV lower than that of the bare microbandgold electrode. The catalytic peak current is proportional to NADH concentration in the range 0.5-6.0 mM with a correlation coefficientof 0.98. The catalytic rate constant of the modified electrode for the oxidation of NADH is determined using a rotating-disc electrode.The mechanism of the oxidation of NADH catalysed by the electrode is discussed.
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