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Capacitive behavior of polycarbazole- and poly(N-vinylcarbazole)-coated carbon fiber microelectrodes in various solutions

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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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  1. Murat Ates

    Present address: Department of Chemistry, Faculty of Arts and Sciences, Namik Kemal University, Namik Kemal Street, Number:14, 59100, Tekirdag, Turkey

Authors and Affiliations

  1. Department of Chemistry, Polymer Science and Technology, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey

    Murat Ates & A. Sezai Sarac

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  1. Murat Ates
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  2. A. Sezai Sarac
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Correspondence to Murat Ates.

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Ates, M., Sarac, A.S. Capacitive behavior of polycarbazole- and poly(N-vinylcarbazole)-coated carbon fiber microelectrodes in various solutions. J Appl Electrochem 39, 2043–2048 (2009). https://doi.org/10.1007/s10800-009-9882-6

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  • DOI: https://doi.org/10.1007/s10800-009-9882-6

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