cobalt hexacyanoferrate modified microband gold electrode and its electrocatalytic activity for oxidation of nadh，成果详细信息-凯发网

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.