Research Article Open Access

The Application of Electrochemical Impedance Techniques in Analyzing the AC Response of Some Two-electron Transfer Dye Systems

Farouk Rashwan

Abstract

The Electrochemical Impedance Spectroscopic techniques (EIS) were used to investigate the behavior of some dye compounds (quinoid systems) characterized with 2e-transfer processes. For this purpose, Alizarin Red S (ARS), Alizarin Cyanine (AC), Alizarin Viridin (AV) and carminic acid were chosen for the measurements. The EIS experiments were performed using a small AC amplitude (10 mV p-p) in addition to a relatively wide frequency range (0.01 Hz ≤ f ≤ 105 Hz). The investigations were carried out at room temperature in aqueous media (HClO4, NaClO4 and KNO3) on the Hanging Mercury Drop Electrode (HMDE) and for comparison one experiment only was measured in aprotic solvent (DMF) on the Pt-disc electrode. The EIS diagrams of these systems were characterized in the complex plane by two fundamental observations, the first of which is a straight line crossing the real axis at an angle of 45° (or at least nearly so) and the second one is two semicircles beside each other corresponding to high-frequency and low-frequency regions, which are implying the presence of well-separated time constants. The EIS characteristic parameters for these dye systems were calculated and discussed.

American Journal of Applied Sciences
Volume 2 No. 12, 2005, 1595-1599

DOI: https://doi.org/10.3844/ajassp.2005.1595.1599

Submitted On: 17 November 2005 Published On: 31 December 2005

How to Cite: Rashwan, F. (2005). The Application of Electrochemical Impedance Techniques in Analyzing the AC Response of Some Two-electron Transfer Dye Systems. American Journal of Applied Sciences, 2(12), 1595-1599. https://doi.org/10.3844/ajassp.2005.1595.1599

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Keywords

  • Electrochemical impedance techniques
  • dye compounds
  • alizarin cyanine
  • alizarin viridin