Electrocatalytic Determination of Traces of Hydrazine by a Glassy Carbon Electrode Modified with Palladium-Gold Nanoparticles

A glassy carbon electrode modified with palladium/gold nanoparticles was successfully prepared by an electrodeposition process. It efficiently oxidizes hydrazine at a low overpotential of -0.26 V versus SCE. The Pd-AuNPs with an average size of 50-80 nm are uniformly dispersed at the GCE. The Pd-AuNPs/GCE was used for determination of hydrazine in phosphate buffer solution of pH 7.0. The amperometric current response of the electrode was increased linearly over a hydrazine concentration of 0.1-500 mu M with a limit of detection of 0.07 mu M. The prepared hydrazine sensor exhibited high sensitivity, good selectivity reproducibility and long term stability.