Poly(3,5-dithiophene-2-yldithieno[3,2-b;2',3'-d]thiophene-co-Ethylenedioxythiophene)/Glassy Carbon Electrode Formation and Electrochemical Impedance Spectroscopic Study


Ates M., OSKEN I., Öztürk T.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, cilt.159, sa.6, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 159 Sayı: 6
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1149/2.041206jes
  • Dergi Adı: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

3,5-Dithiophene-2-yldithieno[3,2-b;2',3'-d]thiophene (Thy(2)DTT) and ethylenedioxythiophene (EDOT) were electro-copolymerized on glassy carbon electrode (GCE) in 0.1 M sodium perchlorate (NaClO4)/acetonitrile (ACN)/dichloromethane (CH2Cl2) (8:2) solution. Poly(Thy(2)DTT-co-EDOT)/GCE thin film was characterized by various techniques, such as Cyclic Voltammetry (CV), Fourier Transform Infrared Spectroscopy - Attenuated Transmittance Reflectance (FTIR-ATR), Scanning Electron Microscopy - Energy Dispersive X-ray analysis (SEM-EDX) and Electrochemical Impedance Spectroscopy (EIS). The effects of monomer mole fractions (mole fraction, X-Thy2DTT = n(Thy2DTT/nEDOT) + n(Thy2DTT)) (0.5, 0.66 and 0.83) during the preparation of modified electrodes were examined by EIS. Capacitive behaviors of the modified GCE were defined via Nyquist, Bode-magnitude, Bode-phase and Capacitance plots. The circuit model was used to fit the theoretical and experimental data through Kramers-Kronig Transform test. The lowest frequency capacitance (C-LF) value was obtained as C-LF = 0.89 mFcm(-2) for poly(Thy(2)DTT). However, the highest C-LF was obtained for the copolymer as C-LF = 1.11 mFcm(-2) for X-Thy2DTT = 0.66 and 0.83. Potential application of the copolymer could be energy-storage devices.