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

A non-enzymatic electrochemical sensor-NiCoS/GCE was constructed for sensitive and selective detection of hydrazine (NH), 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 NiCoS sphere was made of interconnected nanoparticles with porous structure. Electrochemical measurements revealed that the porous NiCoS sphere based sensor exhibited an excellent voltammetric response towards the NH 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 cm. Moreover, determinations of NH 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, NiCoS/GCE promised to be a new platform for electrochemical detection of NH.