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Voltammetric determination of ascorbic acid with zinc oxide modified glassy carbon electrode

Abstract : Zinc oxide (ZnO) nanostructures electrodeposited from aqueous zinc nitrate solution at 70 °C onto glassy carbon electrode (GCE) were used as electrochemical detectors. The morphology, structure, chemical composition and conductivity of the as-deposited layers were determined using Scanning Electron Microscopy, X-Ray Diffraction, Energy Dispersive X-ray analysis and UV-vis spectroscopy. A highly oriented crystalline ZnO deposit made of a dense array of randomly oriented hexagonal nanorods was obtained without any additives in solution. The electrocatalytic oxidation of Ascorbic Acid (AA) was studied using cyclic voltammetry in 0.1 M phosphate buffer solution at pH 6.8. Comparing the response for AA oxidation on the bare and modified electrodes, the peak potential was shifted to-0,45V on ZnO/GCE with higher current densities and transfer coefficient, due to a simultaneous increase of oxidation rate and surface area. A linear relationship was determined between the anodic peak current and the AA concentration in the range of 0.1 to 5 mM.
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Submitted on : Friday, February 7, 2020 - 3:11:28 PM
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Nadia Ait Ahmed, Hammache Houa, Marielle Eyraud, Carine Chassigneux, Florence Vacandio, et al.. Voltammetric determination of ascorbic acid with zinc oxide modified glassy carbon electrode. Journal of the Iranian Chemical Society, 2019, 16 (9), pp.1957-1963. ⟨10.1007/s13738-019-01668-5⟩. ⟨hal-02470781⟩



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