Electrocatalytic Oxidation and Detection of Hydrazine at Glassy Carbon Modified Electrode with Prussian Blue- Complex by Sol-Gel Method

A carbon ceramic electrode was prepared with MWCNTs and Prussian blue (PB) complex and applied to the electrocatalytic oxidation of hydrazine. The resulting PB-modified GCE greatly reduced the over potential by about 177 mV with obviously increase the current response compared with the unmodified GCE. Cyclic voltammetry was employed to characterize the electrochemical behavior of the chemically modified electrode. The electrocatalytic efficiency of the modified electrode towards hydrazine oxidation depends on solution pH, and optimum pH value for oxidation of hydrazine is 7.0. The overall number of electrons involved in the catalytic oxidation of hydrazine and the number of electrons involved in the rate-determining steps are 4 and 1, respectively. and diffusion coefficient of hydrazine was estimated using chronoamperometry.