Electrochemical synthesis of palladium nano urchins decorated multi walled carbon nanotubes for electrocatalytic oxidation of hydrazine and reduction of hydrogen peroxide

A facile electrochemical approach has been developed for the template free synthesis of sea-urchins like palladium (Pd) nanoparticles on multi walled carbon nanotubes (fMWCNTs) coated indium tin oxide electrode (ITO). The electrochemical measurements and surface morphology of the as prepared nanocomposite electrode were studied by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and field emission scanning electrochemical microscopy (FESEM) respectively. The presence of fMWCNTs in the film enhances surface coverage concentration and also increases the electron transfer rate constant of the palladium nanourchins. This Pd nanourchin decorated multiwalled carbon tube modified electrode (Pd/fMWCNTs) exhibits a prominent electrocatalytic activity towards the detection of hydrazine and hydrogen peroxide (H₂O₂).The electrocatalytic responses of the afore mentioned analytes were measured by using cyclic voltammetry and amperometry techniques. The modified electrode also exhibits a rapid and linear electrocatalytic response for both the oxidation of hydrazine and the reduction of H₂O₂. The practical feasibility of the proposed electrode for hydrazine and hydrogen peroxide determination was evaluated in antiseptic solution and water samples as a real sample. Moreover the Pd/fMWCNTs exhibit excellent repeatability, reproducibility and stability for both oxidation of hydrazine and reduction of hydrogen peroxide.