CHARACTERIZATION OF A MODIFIED GRAPHITE ELECTRODE OBTAINED BY HEMIN ELECTROPOLYMERISATION

Graziella Liana TURDEAN

CHARACTERIZATION OF A MODIFIED GRAPHITE ELECTRODE OBTAINED BY HEMIN ELECTROPOLYMERISATION

Authors

Graziella Liana TURDEAN Faculty of Chemistry and Chemical Engineering, Research Center of Electrochemistry and Nonconventional Materials, Babeş-Bolyai University, Cluj-Napoca, Romania. Email: gturdean@chem.ubbcluj.ro. https://orcid.org/0000-0003-1273-6878

Keywords:

iron (III) protoporphyrin (IX), linear sweep voltammetry, hydrogen peroxide, nitrite

Abstract

A new modified electrode (G/polyHm) was obtained by electropolymerisation of iron (III) protoporphyrin (IX) (hemin, Hm) at the surface of a graphite electrode (G), by repetitive scanning the potential between -0.85 and 0 V vs. Ag/AgCl,KCl_sat. The cathodic peak revealed by linear sweep voltammetry at the electrode in phosphate buffer, pH 8, corresponds to one electron transfer process occurring at the Hemin(Fe³⁺)/ Hemin(Fe²⁺) metallic center of the immobilized hemin. All the estimated electrochemical parameters are in accordance with the values reported for immobilized hemin. The electrode exhibits electrocatalytic properties towards the H₂O₂ and NO₂^- reduction, respectively, proving an enzyme-like behaviour of the immobilised hemin, characterised by hyperbolic Michaelis Menten behaviour, when increasing concentrations of substrate were added, irrespective of the scan rate used.

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STUDIA UBB CHEMIA, Volume 60 (LX), No. 3, September 2015

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Published

2015-09-30

How to Cite

TURDEAN, G. L. (2015). CHARACTERIZATION OF A MODIFIED GRAPHITE ELECTRODE OBTAINED BY HEMIN ELECTROPOLYMERISATION. Studia Universitatis Babeș-Bolyai Chemia, 60(3), 119–128. Retrieved from https://studia.reviste.ubbcluj.ro/index.php/chemia/article/view/8473