Flower-like Fe2O3@MoS2 nanocomposite decorated glassy carbon electrode for the determination of nitrite

A novel ferric oxide/molybdenum sulfide (Fe2O3@MoS2) modified glassy carbon electrode (GCE) was fabricated by drop casting Fe2O3@MoS2 and Nafion suspension onto the surface of GCE. Scanning electron microscopy (SEM) image indicates the Fe2O3@MoS2 has a flower-like nanostructure. Both cyclic voltammetry (CV) and linear sweep voltammetry (LSV) results show the Fe2O3@MoS2 modified GCE exhibits excellent electrochemical activity in a 0.1 M phosphate buffered saline (PBS) compared to the Fe2O3 and MoS2 modified GCE. CV results also show the Fe2O3@MoS2 has excellent electrocatalytic behavior to nitrite in a pH 4.0 PBS. The amperometric response result indicates the Fe2O3@MoS2 modified GCE can be used to determine nitrite concentration in a wide linear range of 2.0 and 6730 μM with a detection limit of 1.0 μM.