Abstract
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 0.6 V 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 hydrazine 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.
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