A high-performance non-enzymatic electrochemical hydrazine sensor based on NiCo2S4 porous sphere

A non-enzymatic electrochemical sensor-NiCo 2 S 4 /GCE was constructed for sensitive and selective detection of hydrazine (N 2 H 4 ), which was designed based on porous nanostructure and synthesized through a facile hydrothermal method . The nanocomposite has been characterized using a series of characterizations such as X-ray powder diffraction (XRD), scanning electron microscopic (SEM), transmission electron microscopy (TEM), showing the porous NiCo 2 S 4 sphere was made of interconnected nanoparticles with porous structure. Electrochemical measurements revealed that the porous NiCo 2 S 4 sphere based sensor exhibited an excellent voltammetric response towards the N 2 H 4 oxidation with a wide linear range of 1.7 μM to 7.8 mM, a low detection limit of 0.6 μM (S/N = 3), a sensitivity of 179.1 μA mM −1 cm −2 . Moreover, determinations of N 2 H 4 in tap water samples were carried out by standard addition. Acceptable results with relative standard deviation of 2.1–3.0% and recovery of 95.20–103.6% were obtained for five parallel measurements. Therefore, NiCo 2 S 4 /GCE promised to be a new platform for electrochemical detection of N 2 H 4 .