Nio‐Co3o4‐Rgo as a Multi-Component Transition Metal Oxide Nanocatalyst for Ultra-Level Detection of Nitrite in Beef and Tap Water Samples

The necessity of detection of nitrite as a challenging compound in food industrials always has been considered. Addressed herein, two transition metal oxide based nanocatalysts, NiO ‐ Co3O4 (NC) and its reduced graphene hybridized form, NiO ‐ Co3O4 ‐ rGO (NCR), was prepared by a hydrothermal method. The as-prepared materials physically were characterized by X-ray diffraction, Raman spectroscopy, SEM images and EDAX mapping. The synthetic materials were applied for modification of a glassy carbon electrode to fabricate an effective sensor for nitrite detection in real samples through differential pulse voltammetry. Based on results, NCR showed excellent sensitivity (0.996 nM/V), very low limit of detection(20nM), significant accuracy(above 95%) and good stability at the wide range of nitrite ions (100-500nM) in real samples