الرئيسية / الفعاليات العلمية / ابحاث / Zinc Metal at a New ZnO Nanoparticles Modified Carbon Paste Electrode: A Cyclic Voltammetric Study

Zinc Metal at a New ZnO Nanoparticles Modified Carbon Paste Electrode: A Cyclic Voltammetric Study

Emad Salaam Abood , Amer Mousa Jouda, Muthana Saleh Mashkoor
Department of Chemistry, Faculty of Science, University of Kufa, 54001 AnNajaf, Iraq.
Corresponding authors. E-mail: [email protected]
Received: Apr. 7, 2017; Accepted: May 15, 2018; Published: May 23, 2018.
Citation: Emad Salaam Abood, Amer Mousa Jouda, and Muthana Saleh Mashkoor, Zinc Metal at a New ZnO Nanoparticle Modifed Carbon Paste
Electrode: A Cyclic Voltammetric Study.
Nano Biomed. Eng., 2018, 10(2): 149-155.
DOI: 10.5101/nbe.v10i2.p149-155.
Abstract
A new carbon paste electrode modifed with ZnO nanoparticles was prepared and used to study the
electro oxidation of zinc ions in solution by cyclic voltammetry (CV) method. The modifed electrode
displayed strong resolving function for the overlapping voltammetric response of zinc into one welldefined peak. The potential difference between Epa and Epc was > 200 mV, the range of which
referred to the quasi-reversible mechanism. The kinetic of electrode was studied in the range of
temperature 15-30 °C. The data of voltamograms showed the negative shift increased with increase
of temperature, the result of which referred to the diffusion electron transfer in redox process of
zinc oxidation. Diffusion coffning was calculated from Sevcik-Randles equation and thus equaled
to 1.01×10
-7. The rate constant was equal to 5.2×10-8 and 3.3×10-8 for oxidation and redaction
respectively. And the peak current of zinc increased linearly with its concentration in the range of 2.0-
20.0 ppm.
Keywords: Cyclic voltammetry; Electrode; ZnO nanoparticales; Hydrothermal method

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