Electrochemical oxidation of hydrazine on the surface of silver particles/polymer modifed carbon paste electrode in alkaline media

Silver particles were deposited on the surface of poly ortho -toluidine modified carbon paste electrode (Ag/POT/MCPE) by the electrochemical method. The electrocatalytic activity of the prepared modified electrode towards the hydrazine oxidation in alkaline solutions was evaluated using cyclic voltammetry (CV) and chronoamperometry (CHA) methodes. The CV experiment in the range of −0.4 V to 0.1 V vs. SCE show that the Ag/POT/MCPE electrode is electrochemically active towards the hydrazine oxidation. The onset potential for the hydrazine oxidation moreover a sharp increment in the current of hydrazine oxidation with the increase of the hydrazine concentration was observed. CHA results show stable steady-state current densities (iss) for the hydrazine oxidation. A linear dependence of the iss upon the hydrazine concentration was found in the range of 2.5 - 40 μM hydrazine. Results imply that the Ag/POT/MCPE presents stable and significantly high electroactivity for the hydrazine oxidation