Screen-Printed Electrode Modified with La3+-Doped Co3O4 Nanocubes for Electrochemical Determination of Hydroxylamine

This study represents an electrochemical sensor to determine the hydroxylamine through voltammetry methods based on a screen printed electrode (SPE) modified with La3+-doped Co3O4 nanocubes. The La3+-doped Co3O4 nano-composite was prepared through an easy chemical reduction technique. The modified SPE presented good electrocatalytic performance toward hydroxylamine oxidation. The limit of detection (LOD) (S/N = 3) and sensitivity were obtained 0.08 μM and 0.037 μA/μM, respectively. The sensor was used for detecting hydroxylamine in (spiked) water samples.