Electrocatalytic detection of hydrazine on synthesized nanozeolite-supported Ag nanoparticle-modified carbon paste electrode at a negative potential in an alkaline medium

Abstract

In this work, the electrocatalytic oxidation of hydrazine was investigated using the selective Ag-nanozeolite catalyst based on the low-cost synthesis of nanozeolite. The sensor was successfully prepared by the incorporation of silver nanoparticles in the synthesized NaX nanozeolite structure using ion exchange. The electrocatalytic performance of the catalyst prepared for hydrazine oxidation was investigated using cyclic voltammetry (CV), amperometry and electrochemical impedance spectroscopy (EIS). It has been shown that a proposed catalyst exhibits remarkably electrocatalytic performance at −0.1V vs. Ag|AgCl toward hydrazine oxidation. Moreover, the oxidation peak currents are linearly dependent on the concentration of hydrazine in the wide linear ranges of 12μM to 0.96mM and 0.96mM to 15mM with detection limit of 3.72μM (S/N=3) and fast response time of 3s. The proposed catalyst also indicated good repeatability, reproducibility, stability and selectivity. Moreover, the proposed hydrazine sensor has been successfully applied for the determination of hydrazine in water sample with good recoveries.