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

  • Nadia Ait AhmedEmail author
  • Houa Hammache
  • Marielle Eyraud
  • Carine Chassigneux
  • Florence Vacandio
  • Philippe Knauth
  • Laid Makhloufi
  • Nour-eddine Gabouze
Original Paper


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 − 0.45 V on ZnO/GCE with higher current densities and transfer coefficient, due to a simultaneous increase in oxidation rate and surface area. A linear relationship was determined between the anodic peak current and the AA concentration in the range of 0.1–5 mM.


ZnO electrodeposition Electrocatalysis Electrochemical sensor Ascorbic acid oxidation Thin films 


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Copyright information

© Iranian Chemical Society 2019

Authors and Affiliations

  1. 1.Laboratoire d’Electrochimie, de Corrosion et de Valorisation Energétique (LECVE)Université de BejaiaBejaiaAlgeria
  2. 2.Aix-Marseille Univ, CNRS, MADIREL, UMR 7246, équipe Electrochimie des MatériauxMarseilleFrance
  3. 3.Centre de Recherche en Technologie des Semiconducteurs pour l’Energétique (CRTSE)AlgiersAlgeria

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