Pt-ZnHCF nano-particles adsorbed on a silica gel modified with titanium oxide for electrocatalytical oxidation of hydrazine

The electrocatalytical oxidation of hydrazine at low potential using Pt-ZnHCF nano-particles adsorbed on silica modified with titanium oxide was investigated by cyclic voltammetry (CV) and amperometry. The modified electrode was prepared modifying a carbon paste electrode employing NiHCF adsorbed onto silica gel modified with titanium oxide. This electrode showed an excellent catalytic activity and stability for hydrazine oxidation. With this modified with nano-particles electrode the oxidation potential of hydrazine was shifted toward less positive value, presenting a peak current much higher than those observed on a bare GC electrode. The linear response range, sensitivity and detection limit were, respectively,3 up to 100 μmol L-1,0.41 μA l μmol-1 and 0.70 μmol L-1. The repeatability of the modified electrode evaluated in term of relative standard deviation was 4.8 % for 10 measurements of 100 μmol L-1 hydrazine solution. The number of electrons involved in hydrazine oxidation, the heterogeneous electron transfer rate constant (1.11 x 103 mol-1 l s-1) and diffusion coefficient (6.3 x 10-6 cm2 s-1) were evaluated with a rotating disk electrode (RDE

Keywords:

hydrazine , modified electrode , Pt-ZnHCF