Yazar "Mashrah, Muwafaq" seçeneğine göre listele

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    Evaluation of Weight, area, and Volumetric Specific Capacitance Performance of high Graphene Content ZnFe2O4 Electrode for Supercapacitors
    (Springer, 2024) Polat, Safa; Mashrah, Muwafaq; Maksur, Abdulgani
    The main purpose of this study is to synthesize ZnFe2O4 (ZFO) on a nickel foam along with a high amount of graphene. For this purpose, the productions were carried out with high amounts of graphene by hydrothermal method. According to the characterization results, it has been observed that a high amount of graphene nanosheets (GNPs) were successfully adhered to the current collector surface without agglomeration using this method. The electrochemical results have demonstrated a 97% enhancement in the performance of the ZFO electrode with the addition of GNPs, reaching 622 mF/cm(2) at a current density of 1 mA/cm(2). Additionally, the weight and volumetric specific capacitances of this electrode were calculated as 415 F/g and 519 F/cm(3), respectively. Regarding the charging mechanism of this electrode, it was found to be 82% capacitive and 18% diffusion-controlled according to the Dunn method. The abundance of GNPs compared to those in the literature has increased the effectiveness of the diffusion-controlled charging mechanism.
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    Hydrothermal synthesis and electrochemical performance of GNPs-doped MgFe2O4 electrodes for supercapacitors
    (Elsevier, 2023) Mashrah, Muwafaq; Polat, Safa
    This study sought to determine the effect of graphene on the electrochemical performance of MgFe2O4. The electrode preparation was done directly on the nickel foam surface using a hydrothermal technique. The crys-tallographic, morphological, and chemical configurations of the electrode components were investigated using XRD, FTIR, XPS, SEM, and TEM. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electro-chemical impedance spectrometry (EIS) were used to evaluate its electrochemical characteristics. The findings of the characterization demonstrate that MgFe2O4 was successfully synthesized with GNPs in a porous structure on a Ni foam surface. The electrochemical experiments show that the greatest specific capacitance (Cs) value found is 828 mF/cm2 at 1 mA current. At the same time, its stability after 1500 cycles at 4 mA was observed to be 136%, and its energy-power densities were calculated to be 28.75 mWh/cm2 and 200 mW/cm2. The Cs value in this study is roughly 242% higher than pure MgFe2O4 and 95% higher than MgFe2O4/GNPs in the literature, which is a significant effect of GNPs.
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    Synthesis and electrochemical performance of MgFe2O4 with g-C3N4 on Ni-foam as composite anode material in supercapacitors
    (Springer, 2022) Polat, Safa; Mashrah, Muwafaq
    This study aimed to improve the electrochemical performance of MgFe2O4 (MFO) by combining it with g-C3N4 (g-CN). The hydrothermal process was used to produce electrodes directly on the nickel foam surface. XRD, FTIR, SEM, and TEM analyses were made to describe the electrodes in detail. CV, GCD, and EIS measurements were performed electrochemically at various scanning rates and current densities. According to the findings, g-CN-MFO electrode was successfully synthesized in spongy structure on Ni-foams. The areal capacitance (Ca) of g-CN-MFO was measured as 600 mF/cm(2), which is 152% higher than MFO. At the same time, the energy and power densities of g-CN-MFO were calculated to be 13.3 mWh/cm(2) and 200 mW/cm(2) at 1 mA, respectively. EIS results showed that this increase was probably due to easier diffusion of electrolyte ions onto the electrode surface. As a result, the g-CN-MFO electrode can be considered a promising anode material for supercapacitors due to its low cost, ease of fabrication, and strong electrochemical performance.