Capacitive behavior of polycarbazole- and poly(N-vinylcarbazole)-coated carbon fiber microelectrodes in various solutions |
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Authors: | Murat Ates A Sezai Sarac |
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Affiliation: | (1) Present address: Department of Chemistry, Faculty of Arts and Sciences, Namik Kemal University, Namik Kemal Street, Number:14, 59100 Tekirdag, Turkey;(2) Department of Chemistry, Polymer Science and Technology, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey |
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Abstract: | The electrochemical behavior of polycarbazole (PCz) and poly(N-vinyl carbazole) P(NVCz) was investigated by means of electrochemical
impedance spectroscopy (EIS). Supporting electrolytes made from various combinations of solvents (acetonitrile and propylene
carbonate) and salts (sodium perchlorate, lithium perchlorate, and tetraethyl ammonium perchlorate) were employed in the investigation.
Information on the double layer capacitance (Cdl) and specific capacitance (Csp) of P(NVCz) was achieved by cyclic voltammetry (CV), chronoamperometry and chronopotentiometry. Carbon fiber microelectrodes
(CFME) were electrocoated by cyclic voltammetry in a monomer-free solution and displayed film thicknesses in the range ~200 nm
to ~4.8 μm. The capacitive behavior of the PCz- and P(NVCz)-coated carbon fiber microelectrodes was also investigated by CV.
The effects of the type of electrolyte and solvent on the electrochemical impedance spectroscopic data were subsequently fitted
with an ((R(C(R(Q(RW))))(CR))-equivalent circuit model to calculate the numerical values of the proposed components. The obtained
experimental Csp values for PCz/CFME and P(NVCz)/CFME, as measured in LiClO4/ACN, were 280.5 mF g−1 and 294.1 mF g−1, respectively. |
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