Metal–metal oxide nanostructure supported on graphene oxide as a multifunctional electro-catalyst for simultaneous detection of hydrazine and hydroxylamine

Abstract

A ruthenium/iridium/iridium oxide nanohybrid supported on graphene oxide (RuIrOx_GO) was prepared via a new protocol. The activity of the nanohybrid towards the simultaneous detection of hydrazine (HY) and hydroxylamine (HA) was evaluated in phosphate-buffered saline solution (pH 7.0). Differential pulse voltammetry was used for the measurements, with a pulse amplitude of 50 mV and a scan rate of 0.04 V s−1. Using the modified electrode, the oxidation peak potentials for HY and HA can be easily distinguished, with a large peak separation of 0.36 V. Very low LOD values of 2.1 μM and 1.6 μM were found for HY and HA, respectively. The selectivity of the electrode and its stability were also studied The tolerance limits in the presence of different interfering compounds were evaluated. After five weeks, a deviation from the expected results of ~2% was observed for both HA and HY determinations. Keywords: Ir and Ru active phases, New synthesis protocol, Hydrazine, Hydroxylamine, Low detection limit