Cobalt hexacyanoferrate modified microband gold electrode and its electrocatalytic activity for oxidation of NADH
نویسندگان
چکیده
A stable electroactive thin film of cobalt hexacyanoferrate (COHCF) was electrochemically deposited on the surface of a microband gold electrode. The cyclic voltammograms of CoHCF film indicate the presence of two redox peaks corresponding to the hexacyanoferrate(II/lII) redox couple. The electrochemical behaviour of CoHCF is related to the concentration of supporting electrolyte and counter-ions. The modified electrode shows excellent electrocatalytic activity towards the oxidation of reduced nicotinamide adenine dinucleotide (NADH) in phosphate buffer solution (pH 7.0), with an overpotential ca.310-370 mV lower than that of the bare microband gold electrode. The catalytic peak current is proportional to NADH concentration in the range 0.5-6.0 mM with a correlation coefficient of 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.
منابع مشابه
Catalytic oxidation of reduced nicotinamide adenine dinucleotide at a microband gold electrode modified with nickel hexacyanoferrate
Nickel hexacyauoferrate films have been deposited on the surface of a microbaud gold electrode by cyclic voltammetry. Cyclic voltammograms of the resulting nickel hexacyauoferrate films indicate the presence of a couple of redox peaks which correspond to the hexacyanoferrate(II/III) redox couple. The nickel hexacyanoferrate modified microband gold electrode shows an excellent electrocatalytic a...
متن کاملAmperometric Determination of Ascorbic Acid in Pharmaceutical Formulations by a Reduced Graphene Oxide-cobalt Hexacyanoferrate Nanocomposite
Investigation of the redox properties of drugs and their determination are performed by electrochemical techniques. Data obtained from electrochemical techniques are often correlated with molecular structure and pharmacological activity of drugs. In this regard, different modified electrodes were applied as sensors for quantification of different drugs.A nanocomposite of reduced graphene oxide-...
متن کاملAmperometric Determination of Ascorbic Acid in Pharmaceutical Formulations by a Reduced Graphene Oxide-cobalt Hexacyanoferrate Nanocomposite
Investigation of the redox properties of drugs and their determination are performed by electrochemical techniques. Data obtained from electrochemical techniques are often correlated with molecular structure and pharmacological activity of drugs. In this regard, different modified electrodes were applied as sensors for quantification of different drugs.A nanocomposite of reduced graphene oxide-...
متن کاملELECTROCHEMICAL BEHAVIOR OF GC, Pt AND Au ELECTRODES MODIFIED WITH THIN FILM OF COBALT HEXACYANOFERRATE
0A thin film of cobalt hexacyanoferrate (CoHCF), an analogue of mixed-valence Prussian blue, was deposited electrochemically on the glassy carbon, platinum and gold electrode surfaces in 0.5M KC1 solution. The electrochemical behavior of these modified electrodes show three couples of redox peaks by CV in a supporting electrolyte solution of 0.5M NaCl, whereas for Au modified electrode only ...
متن کاملElectrocatalytic Determination of Glutathione Using Transition Metal Hexacyanoferrates (MHCFs) of Copper and Cobalt Electrode Posited on Graphene Oxide Nanosheets
A glassy carbon electrode was modified with graphene oxide nanosheets and a hybrid of copper-cobalt hexacyanoferrate. The nanocomposite was characterized by cyclic voltammetry, FT-IR and scanning electron microscopy. Cyclic voltammetry showed a stable and reversible redox pair with surface confined characteristics in phosphate buffer solution (0.1 M, pH 3). Hydrodynamic amperometry was used for...
متن کامل