Yazar "Cinar, Damla" seçeneğine göre listele

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    Active carbon/graphene hydrogel nanocomposites as a symmetric device for supercapacitors
    (Taylor & Francis Inc, 2016) Ates, Murat; Cinar, Damla; Caliskan, Sinan; Gecgel, Unal; Uner, Osman; Bayrak, Yuksel; Candan, Idris
    Activated carbons (ACs) are successfully synthesized from Elaeagnus grain by a simple chemical synthesis methodology and demonstrated as novel, suitable supercapacitor electrode materials for graphene hydrogel (GH)/AC nanocomposites. GH/AC nanocomposites are synthesized via hydrothermal process at temperature of 180 degrees C. The low-temperature thermal exfoliation approach is convenient for mass production of graphene hydrogel (GH) at low cost and it can be used as electrode material for energy storage applications. The GH/AC nanocomposites exhibit better electrochemical performances than the pure GH. Electrochemical performance of the electrodes is studied by cyclic voltammetry, and galvanostatic charge-discharge measurements in 1.0 M H2SO4 solution. A remarkable specific capacitance of 602.36 Fg(1) (based on GH/AC nanocomposites for 0.4 g AC) is obtained at a scan rate of 1 mVs(1) in 1 M H2SO4 solution and 155.78 Fg(1) for GH. The specific capacitance was increased 3.87 times for GH/AC compared to GH electrodes. Moreover, the GH/AC nanocomposites for 0.2 g AC present excellent long cycle life with 99.8% specific capacitance retained after 1000 charge/discharge processes. Herein, ACs prepared from Elaeagnus grain are synthesized GH and AC supercapacitor device for high-performance electrical energy storage devices as a promising substitute to conventional electrode materials for EDLCs.
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    The electropolymerization of N,N-(propane-1,3-diyl)bis(2-aminobenzamide), characterization, and capacitor study
    (Sage Publications Ltd, 2018) Ates, Murat; Kolancilar, Hakan; Caliskan, Sinan; Cinar, Damla
    In this study, aniline-based monomer, N,N-(propane-1,3-diyl)bis(2-aminobenzamide), (PAB), was synthesized and characterized by proton nuclear magnetic resonance (1H-NMR), carbon-13 nuclear magnetic resonance (13C-NMR), and Fourier transform infrared spectroscopy. The electropolymerization of the monomer was performed on glassy carbon electrode by cyclic voltammetry (CV). The effects of solvent, dopant, scan number, and scan rate on the electropolymerization and properties of the poly(PAB) films were investigated. The modified electrode was also characterized by Fourier transform infrared-attenuated total reflection spectroscopy and scanning electron microscopy-energy-dispersive X-ray analysis. The capacitive properties of the poly(PAB) films were firstly tested by electrochemical impedance spectroscopy. The highest specific capacitances (C-sp) of poly(PAB) films were obtained as C-sp = 6.22 mF cm(-2) in 0.1 M lithium perchlorate/acetonitrile (ACN) for [PAB]0 = 20 mmol dm(-3) and C-sp = 16.9 mF cm(-2) in 1 mol dm(-3) sulfuric acid for [PAB]0 = 5 mmol dm(-3) at the scan rate of 5 mV s(-1) from CV measurements. This study is novel because it was the first study on capacitance performances of poly(PAB) films in the literature.