Yazar "Serin, Mehmet Akif" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Electrochemical supercapacitors of PANI/MWCNT, PEDOT/MWCNT and P(ANI-co-EDOT)/MWCNT nanocomposites
    (Springer, 2019) Ateş, Murat; Serin, Mehmet Akif; Calisskan, Sinan
    In this study, the composite formations of polyaniline (PANI)/multi-walled carbon nanotube (MWCNT), poly(3,4-ethylenedioxythiophene) (PEDOT)/MWCNT, and poly(aniline-co-3,4-ethylenedioxythiophene) (P(ANI-co-EDOT))/MWCNT were synthesized on glassy carbon electrode by cyclic voltammetry (CV) method. The composite films were characterized by CV, Fourier transform infrared-attenuated reflection spectroscopy, Raman spectroscopy, scanning electron microscopy-energy-dispersive X-ray analysis, thermogravimetric analysis-differential thermal analysis, Brunauer-Emmett-Teller surface analysis, transmission electron microscopy and electrochemical impedance spectroscopy (EIS). The modified electrodes were characterized by CV, galvanostatic charge/discharge and EIS analysis to measure the capacitance, energy and power density values. The highest specific capacitance was obtained as C-sp=590.71F/g for PANI/MWCNT at a scan rate of 50 mV/s by CV method. The PANI/MWCNT composites are promising electrode materials for high-performance electrical energy storage devices compared to PEDOT/MWCNT or P(ANI-co-EDOT)/MWCNT. The stability tests were also taken for nanocomposite films. PEDOT/MWCNT composites present excellent long cycle life with 97.44% specific capacitance retained after 500 cycles.
  • Küçük Resim
    Öğe
    Supercapacitor behaviors of polyaniline/CuO, polypyrrole/CuO and PEDOT/CuO nanocomposites
    (Springer, 2015) Ateş, Murat; Serin, Mehmet Akif; Ekmen, İlker; Ertas, Yavuz N.
    Polyaniline (PANI)/copper oxide (CuO), poly(3,4-ethylenedioxythiophene) (PEDOT)/CuO and polypyrrole (PPy)/CuO have been synthesized electrochemically on glassy carbon electrode in sodium dodecyl sulfate in sulfuric acid solution as an electroactive material. To our best knowledge, the first report on comparison of supercapacitor behaviors of PANI/CuO, PEDOT/CuO and PPy/CuO nanocomposite films was studied by electrochemical impedance spectroscopy, related to the plots of Nyquist, Bode magnitude and Bode phase. The highest specific capacitance (C (sp)) was obtained as C (sp) = 286.35 F x g(-1) at the scan rate of 20 mV x s(-1) for PANI/CuO amongst the PEDOT/CuO (C (sp) = 198.89 F x g(-1) at 5 mV x s(-1)) and PPy/CuO (C (sp) = 20.78 F x g(-1) at 5 mV x s(-1)) by CV method. Long-term stability of the capacitor has also been tested by CV method, and the results indicated that, after 500 cycles, the specific capacitance of PANI/CuO nanocomposite film is 81.82 % of the initial capacitance. An equivalent circuit model of R (s)(C (dl)(R (1)(Q(R (2) W)))) has been used to fit the experimental and theoretical data.