Yazar "Nazligul, Huseyin" seçeneğine göre listele

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    3D printed honeycomb transition metal decorated electrodes for hydrogen production
    (Elsevier Sci Ltd, 2024) Mert, Mehmet Erman; Nazligul, Huseyin; Aydin, Emine Avsar; Mert, Basak Dogru
    In this study, a PV-wind hybrid system was proposed as a power source for hydrogen production by alkaline electrolysis and it was examined MATLAB simulation for Adana region. In the alkaline electrolysis cell, lab-made 3D printed cathode substrates were used and its electrocatalytic activity was enhanced via electrodeposition of Ni, Cu and NiCu. The characterization was achieved via scanning electron microscopy, energy-dispersive X-ray, transmission electron microscopy, contact angle measurement and X-Ray diffraction analysis. The electrochemical performance was determined via linear sweep voltammetry, cyclic voltammetry, Tafel polarization measurements, electrochemical impedance spectroscopy, chronoamperometry. Results showed that 3DNiCu electrode exhibited nodular shaped homogeneous surface characteristics and NiCu (111) and (200) crystalline morphology; it also demonstrated lower polarization resistance and higher current density during alkaline electrolysis procedure.
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    Design and performance analysis of a PV-assisted alkaline electrolysis for hydrogen production: An experimental and theoretical study
    (Elsevier Sci Ltd, 2024) Mert, Mehmet Erman; Edis, Cansu; Akyildiz, Senay; Demir, Beyza Nur; Nazligul, Huseyin; Gurdal, Yeliz; Mert, Basak Dogru
    The PV assisted alkaline electrolysis cell was established for hydrogen generation. Lab-made AgNiCu modified nickel foam cathodes were used in this system. The characterization was achieved using field emission scanning electron microscopy, energy-dispersive X-ray and X-Ray diffraction analysis. The electrochemical performance was investigated via linear sweep voltammetry, cyclic voltammetry, Tafel polarization measurements and electrochemical impedance spectroscopy. The electrolysis potential and time depended efficiency was monitored. The structural theoretical analysis of the electrode surface and hydrogen evolution characteristics were also determined applying Density Functional Theory and Ab-initio Molecular Dynamics simulations which identified the role of Ag decoration and Cu incorporation on the surface against water and proton adsorptions. The modified cathode (AgNiCuF) improved the hydrogen production performance owing to lower hydrogen onset potential (-1.1 V) and charge transfer resistance (0.362 ohm at -1.5 V).
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    Experimental and computational study of a solar-powered electrolysis system with a SEPIC converter for green hydrogen production
    (Pergamon-Elsevier Science Ltd, 2025) Nazligul, Huseyin; Mert, Mehmet Erman; Edis, Cansu; Demir, Beyza Nur; Gurdal, Yeliz; Elattar, Khaled M.; Mert, Basak Dogru
    The study presents an integrated approach for sustainable hydrogen production by coupling a photovoltaic system with an alkaline electrolysis unit optimized for fluctuating solar conditions. The catalyst for the electrolysis system was NiCoMo-modified Ni foam, which was created using a two-stage galvanostatic procedure that involved Ni and Co deposition followed by Mo enrichment. Electrochemical tests such were used to verify the catalytic activity of alkaline electrolysis. The device produced 120.2 mL of hydrogen in 30 min at 3 V, with a Faradaic efficiency of around 93.6 %, showing suitable electrochemical efficiency. To ensure stable electrolysis operation, a SEPIC DC-DC converter was integrated into the system, managed by real-time maximum power point tracking algorithms-Particle Swarm Optimization, Genetic Algorithm, and Artificial Bee Colony-modeled using 2023 solar irradiance data from Adana, Turkey. The ABC algorithm demonstrated the fastest convergence performance. The SEPIC converter successfully stabilized the output voltage at 7.5 V despite daily and seasonal battery voltage variations, maintaining optimal catalyst operating conditions. In the theoretical part of the study, a Co and Mo-doped Ni surface was constructed, and water adsorption on the most stable surface was examined using Density Functional Theory (DFT). Computational examination of the electrical structure revealed that Mo atoms contribute significantly more to the alloy matrix than Ni and Co. DFT calculations found that the oxygen atom of the water molecule adsorbs on top of the Mo atom at an adsorption energy of -1.03 eV. Mo doping on the Ni(111) surface directly enhances the strength of water adsorption.
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    Experimental and theoretical study: Design and implementation of a floating photovoltaic system for hydrogen production
    (Wiley, 2022) Gullu, Emre; Mert, Basak Dogru; Nazligul, Huseyin; Demirdelen, Tugce; Gurdal, Yeliz
    In this study, lab-made modified graphite cathodes were used to design and implement floating PV assisted alkaline electrolysis cell. The influence of temperature on PV performance was studied both experimentally and theoretically, and the PV module performance was investigated in floating as well as non-floating modes. Power generation of floating PV panel and non-floating PV panel at four different air temperatures was examined. Although there was no substantial improvement in power generation at 6 degrees C or 16 degrees C, values improved by 6.25% and 10.75% at 24 degrees C and 37 degrees C, respectively. For alkaline electrolysis cell part of this system, the graphite (G) cathode was galvanostatically coated with nickel (G/Ni) and decorated with cobalt nano-particles (G/Ni/Co). The characterization of the electrode was achieved using X-Ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The Co(111)-decorated Ni was determined by XRD, the electrode surface was very rough in FE-SEM micrographs, the detected features provided a larger contact area that supported the formation of simultaneous electrochemical reactions. The electrochemical behavior of electrodes were determined in 1 M KOH by cyclic voltammetry (CV). The modified cathode (G/Ni/Co) enhanced the hydrogen production performance owing to lower hydrogen onset potential. Electronic structure calculations were carried out in order to investigate water as well as proton adsorption on a Co-decorated Ni(111) surface. Density Functional Theory (DFT) calculations identified the role of Co cluster and Ni surface on water and proton adsorptions. According to our knowledge of the literature to date, the practical and theoretical analysis of a floating PV assisted-an alkaline electrolysis system that worked with the laboratory-made electrodes has not been performed before. Results showed that floating PV panels were beneficial than land mounted panels and the G/Ni/Co enhanced the hydrogen generation performance of the system.
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    Extreme weather impacts on LiFePO4 batteries: Insights from arrhenius-based analysis and charging techniques
    (Elsevier, 2026) Nazligul, Huseyin; Savrun, Murat Mustafa; Mert, Basak Dogru
    Lithium iron phosphate (LiFePO4) batteries are known for their safety and thermal stability, but their real-world performance under extreme temperatures remains a challenge. This study evaluates the behavior of LiFePO4 batteries at-10 degrees C and 45 degrees C using both the conventional CC-CV algorithm and a pulse charging method, each tested at 1C, 2C, and 3C rates. Comprehensive simulations were conducted for 720 h in MATLAB Simulink, using dynamic temperature profiles to closely mirror real-world operational conditions. By integrating pulse charging into high-fidelity simulations, this work enables a systematic comparison with the conventional CC-CV algorithm under extreme ambient temperatures. At-10 degrees C, both methods showed greater capacity loss and longer charging times. However, pulse charging achieved better capacity retention, ending with 2.159 Ah at 3C, compared to 2.145 Ah for CC-CV, from an initial 2.322 Ah. CC-CV offered a higher cycle count (185 vs. 132 at 3C). At 45 degrees C, pulse charging also outperformed CC-CV in capacity retention (2.155 Ah vs. 2.085 Ah at 3C), but CC-CV again maintained a higher cycle count (684 vs. 481). These results demonstrate a clear trade-off between maximizing capacity and extending cycle life, depending on temperature and charging strategy. Additionally, activation energies for capacity degradation were extracted using Arrhenius-based analysis, confirming strong temperature dependence. The findings provide practical guidance for battery management systems in electric vehicles and grid storage, especially for optimizing charging strategies in harsh environments.
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    Sustainable energy solutions: 3D printed PLA-NiMo@Ag for green hydrogen production
    (Pergamon-Elsevier Science Ltd, 2025) Mert, Basak Dogru; Nazligul, Huseyin; Aksaray, Goncagul; Mert, Mehmet Erman; Seyedzavvar, Mirsadegh; Kardas, Gulfeza
    This study investigates integration of green-synthesized nanocatalysts with 3D-printable material and use the resulting structures as electrocatalysts (NiMo@Ag-PLA electrode) in a photovoltaic-supported alkaline electrolysis system. Honeycomb-structured cathodes were created by fused deposition modeling (FDM), green-synthesized NiMo@Ag nanoparticles embedded to improve electrochemical activity. The characterization and surface monitoring were performed using UV-VIS, FTIR, Zeta potential analysis, AFM, XRD, FE-SEM-EDX, TEM and contact angle measurements, that confirmed the formation of core-shell structure with uniform dispersion in PLA matrix. Electrochemical tests revealed that the hydrogen evolution reaction (HER) performance was enhanced by lowering the onset potential to-255 mV vs. Ag/AgCl, increasing the current density by nearly ninefold at-2.0 V vs. Ag/AgCl compared to PLA, and reducing the charge transfer resistance by approximately twenty-fivefold relative to PLA. These findings show the potentiality of combining green-synthesized nano-materials with 3D printing and solar energy to develop efficient systems for sustainable hydrogen production.