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Browsing by Author "Doslu, Serap Toprak"

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    Electrochemical Behavior of Pt Nano-Particles Dispersed on Cu/Ni Electrode in Alkaline Environment
    (Pergamon-elsevier Science Ltd, 2024) Toprak Döşlü, Serap; Doner, Ali
    The development of a low-cost Pt-based electrocatalyst for industrial water splitting is important. In this study, to prepare cost-efficient Pt-based electrocatalyst for hydrogen evolution, Cu electrode is deposited with nickel (Cu/ Ni) and this surface is modified with Pt nanoparticles by electrodeposition method (Cu/Ni-Pt). The surface properties of the produced electrocatalysts are studied via X-ray diffraction (XRD), scanning electron spectroscopy (SEM), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Characterizations demonstrated that the coating is homogeneous and compact. Hydrogen evolution and corrosion behaviors of prepared electrode (Cu/Ni-Pt) are examined in 1.0 M KOH solution using cyclic voltammetry (CV) and cathodic and anodic current-potential curves, electrochemical impedance spectroscopy (EIS). Tafel slope is determined to be 133 mV dec(-1) on Cu/Ni-Pt. Very high exchange current density (5.65 mA cm(-2)) and very low charge transfer resistance (0.91 Omega cm(2) at 1.05 V vs RHE) are measured again on this electrocatalyst. High activity is due to intrinsic activity of Pt and synergistic interaction of Pt and Ni. Besides, Cu/Ni-Pt exhibits so stable structure over 4 h without any current densities decay as well as showing good corrosion performance after long-term immersion times and these properties make it possible electrocatalyst with high corrosion resistant and activity in the water electrolysis systems.
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    Electrochemical Tuning of Ni-Fe Catalysts Using Various Techniques for Efficient Hydrogen Evolution in Alkaline Media
    (Mdpi, 2025) Topak, Ali; Doslu, Serap Toprak
    The search for cost-effective and scalable electrocatalysts for the hydrogen evolution reaction (HER) remains a critical challenge in advancing sustainable energy technologies. This study presents a novel approach to optimizing nickel-iron (Ni-Fe) alloy coatings on graphite (G) electrodes through a strategic combination of composition tuning, nickel modification, and various electrochemical optimizations. Unlike conventional studies, which primarily focus on static alloy compositions, this work systematically investigates the impact of dynamic nickel modification durations on the catalytic performance and conductivity of Ni-Fe alloys. By addressing the conductivity limitations caused by iron oxidation, the study demonstrates the enhanced HER kinetics achieved with a Ni-modified G/Ni%95Fe%5-Ni(60s) electrode. Electrochemical and structural analyses reveal the synergistic effects of nickel modifications on improving active site accessibility, reducing overpotential, and increasing hydrogen production efficiency. This work introduces a scalable methodology for tailoring Ni-Fe catalysts, offering significant advancements in the development of robust, cost-effective electrocatalysts for industrial-scale hydrogen production.