Preparation of nanoporous nickel phosphate VSB-5 nanorods carbon paste electrode as glucose non-enzymatic sensor

In this paper, nanoporous nickel phosphate VSB-5 nanorods was synthesized with microwave irradiation and hydrothermal treatment and characterized by X-ray diffraction, FT-IR spectroscopy, Filed emission scanning electron microscopy (FESEM) and EDS analysis. FESEM technique exhibited the presence of nickel phosphate nanorods morphology. The BET surface area, total pore volume and average pore diameter of synthesized nickel phosphate were obtained to be 102.5 m² g^?1, 0.14 cm³ g^?1 and 3.6 nm, respectively. Carbon paste electrode (CPE) was modified by VSB-5 nanorods and then Ni²⁺ ions incorporated to this electrode to obtain Ni-VSB-5/CPE. The current intensity of glucose oxidation increases impressively on the surface of Ni-VSB-5/CPE and modified CPE can reduce the overvoltage of glucose oxidation in comparison with Ni-CPE. The values of electron transfer coefficient, diffusion coefficient and mean value of catalytic rate constant for glucose and redox sites of electrode were found to be 0.87, 6.18 × 10^?4 cm² s^?1 and 3.06 × 10⁵ cm³ mol^?1 s^?1, respectively. The good catalytic activity, high sensitivity, good selectivity and stability and ease of preparation rendered the Ni-VSB-5/CPE to be a capable electrode for glucose electro-oxidation.