Electrochemical sensing of phenolic pollutant catechol on LaNiO₃ perovskite nanostructure platform

Facile synthesis of perovskite materials for the electrochemical sensing applications are remains challenging. In the current work, a simplified electrochemical sensor system based on an electrode modifier containing LaNiO₃ was developed to detect catechol (CC). The surface micrograph of LaNiO₃ was examined using X-ray diffraction pattern (XRD), X-ray photoelectron spectroscopy (XPS), and High-resolution transmission electron microscopy (HRTEM). Besides, the LaNiO₃ reveals a remarkable electrooxidation response for the detection of catechol by cyclic voltammetry (CV) and amperometry techniques. The suggested sensor platform shows a broad linear range for catechol detection from 5 µM to 2000 µM with LOD and sensitivity of 0.6 µM and 54 µA cm⁻² mM⁻¹, respectively, under optimised conditions. Furthermore, LaNiO₃ altered GCE was fruitfully implemented for the quantification of catechol in tap water sample.