A novel titanium-supported Ag/Ti electrode for the electro-oxidation of hydrazine

Silver nanoparticles were directly deposited on the Surface of titanium by the hydrothermal method using polyethylene glycol as the reduction agent. The electrocatalytic activity of the prepared titanium-supported nanoAg/Ti electrode towards hydrazine oxidation in alkaline Solutions was evaluated using cyclic voltammetry (CV) and chronoamperometry (CA). The CV results show that the nanoAg/Ti electrode is electrochemically active towards hydrazine oxidation with oxidation potentials ranging between -0.6 and 0.6V vs. SCE. The onset potential of ca. -0.6 V vs. SCE for the hydrazine oxidation was recorded. A sharp increment in the current density of hydrazine oxidation with the increase of the hydrazine concentration was observed. CA results show stable steady-state current densities (i(ss)) for the hyrdrazine oxidation. For the anodic potential holding at 0.1 V, the CA measurement delivered the i(ss) value of over 0.58 mA cm(-2) mM(-1) in the presence of 20 mM hydrazine. A linear dependence of the i(ss) upon the hydrazine concentration was found in the range of 0-60 mM hydrazine. Results imply that the nanoAg/Ti electrode presents stable and significantly high electroactivity for the hydrazine oxidation. (c) 2008 Elsevier B.V. All rights reserved.