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    Electrochemical Capacitor Behavior of Polypyrrole Coated Mild Steel Electrodes
    (Esg, 2019) Yagan, Aziz; Dogruyol, Zeynel
    Polypyrrole (PPy) coatings have been deposited potentiodynamically on mild steel surface from 0.3 M aqueous oxalic acid solutions containing 0.1 M pyrrole. Cyclic voltammetry and electrochemical impedance spectroscopy techniques (EIS) were used to investigate the electrochemical properties of coatings in 0.3 M oxalic acid solutions. The performance of the capacitors was tested by using galvanostatic charge-discharge cycling within a potential range from 0.0 to 0.6 V. The maximum specific capacitance of PPy coated mild steel electrode is 8.57 x 10(3) F g(-1). The Pyy-coated mild steel system behaved like PAni and not as Ppy, exhibited high capacitance. It can be safely concluded the feasibility of the PPy coated mild steel electrode for use in electrochemical capacitor.
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    Electrochemical co-polymerization of a novel fluorene derivative with 3,4-ethylenedioxythiophene
    (Elsevier Science Sa, 2009) Bezgin, Buket; Yagan, Aziz; Onal, Ahmet M.
    The co-polymerization of a novel fluorene derivative, N-(9H-fluoren-9-ylidene)benzamine (FBA), with 3,4-ethylenedioxythiophene (EDOT) was successfully achieved in acetonitrile via direct anodic oxidation of the monomer mixtures both on platinum and indium-tin oxide working electrodes. The characterization of copolymer films, poly(EDOT-co-FBA), was carried out utilizing electrochemical, spectroelectrochemical, electrochemical impedance (EIS), and FT-IR techniques. It is found that poly(EDOT-co-FBA) films which were synthesized with a feed ratio of FBA/EDOT 5/2 via both potentiodynamically and potentiostatically, had different properties than that of electrochemically prepared poly(3,4-ethylenedioxythiophene) (PEDOT) film. Spectroelectrochemical investigations revealed that copolymer films exhibit relatively lower band gap (1.63 eV) than that of polyfluorenes. Electrochemical impedance spectroscopy (EIS) was also employed to investigate both the resistance and capacitance properties of copolymer coatings. (C) 2009 Elsevier B.V. All rights reserved.
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    Investigation of Polypyrrole-Based Iron Electrodes as Supercapacitors
    (Esg, 2019) Yagan, Aziz
    Polypyrrole (PPy) was successfully electropolymerized potentiodynamically on prepassivated Fe electrode in an aqueous solution containing monomer and oxalic acid. Electropolymerization of PPy was performed between 0.3 V and 0.8 V vs SCE with a scan rate of 20 mV/s. Electrochemical properties of PPy coated Fe electrode were carried out using cyclic voltammetry, galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The maximum specific capacitance of PPy coated Fe electrode is 2280 F/g. This indicates the feasibility of the PPy coated Fe electrode for use in electrochemical capacitor. However, the PPy coated Fe system behaved like PAni and not as Ppy, exhibited high capacitance.