Abstract: The method and conditions of preparing ferulic acid film at glassy carbon electrode by electropolymerization have been studied. The electrochemical characteristics and charge transmission process in films have been explored initially with cyclic voltammetry, staircase voltammetry and A.C. impedance. The apparent electron transfer coefficient and standard rate constant (ks) was o.49 and 6.56 s－1 for poly (ferulic acid) film (L=0.5 μm) respectively. The diffusion coefficients within the film is 7.9×108 cm2•s－1 for oxide and is 4.8 ×108 cm2•s－1 for reductive poly(ferulic acid).The ferulic acid modified electrode shows electrocatalytic activity for oxidation of NADH in 0.1 mol•dm－3 phosphate buffer solution. The peak currents were proportional to the concentrations of NADH in the range of 0.01～5.0 mmol•dm－3.

Key words: Nicotinamide adenine dinucleotide (NADH), Ferulic acid, Chemical modified electrode (CME), Glassy carbon electrode, 　Electropolymerization, Electrocatalytic