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.

Preparation of Ag@zeolitic imidazolate framework-67 at room temperature for electrochemical sensing of hydrogen peroxide.

In this work, a novel non-enzymatic hydrogen peroxide sensor, Ag@zeolitic imidazolate framework-67 (Ag@ZIF-67)/glassy carbon electrode (GCE), was fabricated by a simple method at room temperature. The morphology and structure of Ag@ZIF-67 were investigated by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, atomic absorption spectrophotometry, and N2 absorption isotherms, which indicated that core-shell Ag@ZIF-67 was successfully synthesized with a porous rhombic dodecahedron structure. Electrochemical investigations demonstrated that the Ag@ZIF-67/GCE had strong electrocatalytic activity towards hydrogen peroxide reduction with a low detection limit of 1.