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    rGO/CuO/PEDOT nanocomposite formation, its characterisation and electrochemical performances for supercapacitors
    (Taylor & Francis Ltd, 2019) Ates, Murat; Garip, Alpay; Yoruk, Ozan; Bayrak, Yuksel; Kuzgun, Ozge; Yildirim, Murat
    Supercapacitor properties of rGO, CuO, PEDOT and rGO/CuO at [rGO](o)/[CuO](o) = 1:1; 1:1.5; 1:2 and rGO/CuO/PEDOT nanocomposite at [rGO](o)/[CuO](o)/[EDOT](o) = 1:1:1; 1:1:3; 1:1:5 were investigated using chemical reduction of GO and in-situ polymerisation process. SEM-EDX, HRTEM, BET surface area analysis confirm the nanocomposite formations. Nanocomposite materials are also analysed through FTIR-ATR, Raman, TGA-DTA, GCD, CV and EIS. The highest specific capacitance of C-sp = 156.7 F/g at 2 mV/s is determined as rGO/CuO/PEDOT at [rGO](o)/[CuO](o)/[EDOT](o) = 1:1:5. In addition, two-electrode supercapacitor device for rGO/CuO/PEDOT at [rGO](o)/[CuO](o)/[EDOT](o) = 1:1:5 are found to provide a maximum specific energy (E = 14.15 Wh/kg at 20 mA) and specific power (P = 24730 W/kg at 50 mA), electrical serial resistance (ESR = 13.33 omega) with good capacity retention after 3000 cycles. An equivalent circuit model of LR1(CR2)(QR3) is proposed to interpret the EIS data. The supercapacitor performance of the rGO/CuO/PEDOT nanocomposite electrode indicates the synergistic effect of hybrid supercapacitors.
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    Supercapacitor performances of RuO2/MWCNT, RuO2/Fullerene nanocomposites
    (Wiley, 2019) Ates, Murat; Kuzgun, Ozge; Yildirim, Murat; Yoruk, Ozan; Bayrak, Yuksel
    In this study, RuO2/Fullerene and RuO2/MWCNT nanocomposites were synthesized to use as an electroactive materials in symmetric supercapacitor device performances. The materials were examined via Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), thermo-gravimetric analysis (TGA-DTA), scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The RuO2/MWCNT and RuO2/Fullerene nanocomposite electrodes show good electrochemical performances. For instance, the highest specific capacitance of RuO2/Fullerene and RuO2/MWCNT electrodes reaches C-sp = 3895.11 and 1662.19F/g at 1mV/s within the potential range of 0.8 V in 1 M H2SO4 solution. RuO2/MWCNT and RuO2/Fullerene nanocomposites have good cycle stability similar to 100% specific capacitance at [RuO2](o)/[MWCNT](o) = 1:1; 2:1 and [RuO2](o)/[Fullerene](o) = 2:1, respectively. The different equivalent circuit models of LR(1)Q(C1R2) and LR1(Q(1)R(2))(Q(2)R(3)) were used to interpret EIS data.
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    Synthesis of rGO/TiO2/PEDOT nanocomposites, supercapacitor device performances and equivalent electrical circuit models
    (Springer, 2019) Ates, Murat; Bayrak, Yuksel; Ozkan, Haydar; Yoruk, Ozan; Yildirim, Murat; Kuzgun, Ozge
    A new nanocomposite electrode incorporating poly(3,4-ethylenedioxythiophene) (PEDOT) within the nanocomposite film of the reduced graphene oxide / Titanium dioxide (TiO2) was synthesized to be used in supercapacitor devices. We used constant EDOT monomer for in-situ polymerization and different initial monomer concentration ratio of [rGO](o)/[TiO2](o)=1/1, 1/2 and 1/5. The obtained nanocomposites were examined by FTIR-ATR, UV-vis, SEM-EDX, TGA-DTA, BET surface areas and pore distribution, XRD, TEM, AFM, CV, GCD and EIS analyses. The results showed that graphene oxide was successfully reduced to rGO by means of the microwave-assisted method. It was confirmed by the increases in the specific capacitance of (C-sp=652F/g) at 1mV/s for the rGO/TiO2/PEDOT nanocomposite at [rGO](o)/[TiO2](o)=1/5. This was related to the pore size (similar to 33.50nm) of the material for rGO/TiO2/PEDOT at [rGO](o)/[TiO2](o)=1/5 obtained from BET analysis. The other C-sp values were 475.33F/g for [rGO](o)/[TiO2](o)=1/2, 114.09F/g for rGO/PEDOT and 48.02F/g for [rGO](o)/[TiO2](o)=1/1. Equivalent circuit model of R-ct(CdlRct) was analyzed via ZSimpWin and TINA programmes. A facile and inexpensive approach for a ternary nanocomposite synthesis of rGO/TiO2/PEDOT was presented for future supercapacitor applications.