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    Öğe
    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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    Öğe
    Production of NiCoMo-Supported Ni Foam for Electrocatalytic Oxidation of Methanol: Experimental and RSM Analysis
    (Springer Heidelberg, 2024) Mert, Basak Dogru; Demir, Beyza Nur; Edis, Cansu; Akyildiz, Senay; Ozgur, Ceyla; Mert, Mehmet Erman
    The Ni-, Co-, and Mo-supported Ni foam (NiF-NiCoMo) was produced via galvanostatic method, and electrooxidation of methanol in alkaline medium was examined. The characterization was achieved using field emission scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction analysis. The electrochemical behavior was determined via cyclic voltammetry and chronoamperometry analysis. The contribution of each transition metal to electrocatalytic performance of NiF was monitored via mono, binary, and ternary modifications of each transition metal (Ni, Co, and Mo) for several amounts (5, 10, and 15 mu g). Experiments were performed to determine the influence of catalyst amounts, methanol concentration, and scan rate parameters. The impacts of independent parameters on methanol electrooxidation were statistically investigated using Design-Expert software. The ability to analyze multiple parameters with a limited number of experimental performances is one of the method's key benefits. The developed model showed that 9.41 and 14.03 mu g catalyst amounts were the appropriate values for NiF-NiMo and NiF-NiCoMo achieving optimal circumstances, respectively.