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Electrochemical Characteristics of Poly(o-Aminobenzoic Acid) Modified Glassy-Carbon Electrode and Its Electrocatalytic Activity towards Oxidation of Epinephrine

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Abstract

Poly(o-aminobenzoic acid) (o-ABA) film is deposited on glassy-carbon electrode (GCE) by electropolymerization in pH 7.0 phosphate buffer solution (PBS). Electrochemical behavior of modified electrode is investigated by electrochemical impedance spectroscopy (EIS), different pulse voltammetry (DPV), and cyclic voltammetry (CV). The results indicate that there is a greater resistance during the electron transfer process in poly(o-ABA) film than in bare GCE for the redox of [Fe(CN)6]3−/[Fe(CN)6]4−. Further research indicates that epinephrine (EP) can be strongly absorbed on the surface of the poly(o-ABA) film-modified electrode. The modified electrode shows an excellent electrocatalytical activity on EP oxidation. The EP cathodic peak potential shifts negatively with a slope of −53.5 mV/pH, indicating that equal amounts of proton and electron are involved in the electrode reaction process. In pH 7.0 PBS, the peak current of EP and the concentration has a linear relationship from 0 to 65 µM by amperometric current-time curve.

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Authors and Affiliations

  1. Anhui Normal University, Wuhu, 241000, People's Republic of China

    W. Cheng, G. Jin & Y. Zhang

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  1. W. Cheng
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  2. G. Jin
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  3. Y. Zhang
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Correspondence to Y. Zhang.

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__________

From Elektrokhimiya, Vol. 41, No. 9, 2005, pp. 1059–1065.

Original English Text Copyright © 2005 by Cheng, Jin, Zhang.

The text was submitted by the authors in English.

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Cheng, W., Jin, G. & Zhang, Y. Electrochemical Characteristics of Poly(o-Aminobenzoic Acid) Modified Glassy-Carbon Electrode and Its Electrocatalytic Activity towards Oxidation of Epinephrine. Russ J Electrochem 41, 940–945 (2005). https://doi.org/10.1007/s11175-005-0160-6

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  • DOI: https://doi.org/10.1007/s11175-005-0160-6

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