Electrochemical impedance spectroscopic study of polyaniline on platinum, glassy carbon and carbon fiber microelectrodes


Sarac A. S. , Ates M., Kilic B.

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, vol.3, no.7, pp.777-786, 2008 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 3 Issue: 7
  • Publication Date: 2008
  • Title of Journal : INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
  • Page Numbers: pp.777-786

Abstract

In this study, aniline (ANI) was electropolymerized on three different electrodes; platinum (Pt), glassy carbon (GC), and carbon fiber micro electrodes (CFME) in acid aqueous solution (0.5 M H2SO4) by cyclic voltammetry (CV). Electrode / PANI / electrolyte system was studied by electrochemical impedance spectroscopy (EIS). The results indicate the choice of electrode has a little effect on anodic (E-a) and cathodic peak potentials (E-c) during electropolymerization process. An equivalent electrical circuit ( R( Q( R( C( R( C( RW))))( CR)) was proposed for PANI on three different electrodes. The highest low frequency capacitance (C-sp= 120 mF /cm(2)) was obtained for PANI/Pt electrode compared to PANI/CFME (239.1 mu F /cm(2)) and PANI / GC ( 38.9 mu F /cm(2)) electrode. However, the highest double layer capacitance was obtained for PANI / CFME (C-dl = 190.9 mF /cm(2)) than Pt electrode (58.2 mF /cm(2)) and GC (24.3 mF /cm(2)).