The First Use of Rh(III)-Complex Modified Carbon Ceramic Electrode for the Electrocatalytic Oxidation of Hydrazine

A carbon ceramic electrode activated with MWCNTs and modified with [Rh(terpyridine)(bipyridine)Cl] (PF6)2, have been applied to the electrocatalytic oxidation of hydrazine which reduced the overpotential by about 165 mV with obviously increase the current response. 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.