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Browsing by Author "Khalid, Sarwar"

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    The Preparation, Characterization, and Electrooxidation of Colloidal Palladium Modified Poly(Methacrylic Acid) Hydrogel as Formic Acid Fuel Cell Anode Catalyst
    (Wiley, 2022) Kivrak, Hilal; Khalid, Sarwar; Caglar, Aykut; Alpaslan, Duygu; Selcuk, Kadir; Dudu, Tuba Ersen; Aktas, Nahit
    At present, poly(methacrylic acid) (MA), poly(MA) hydrogel, and Pd-doped poly(MA) hydrogel modified electrodes are constructed on graphite pencil (G). The Pd precursor is coated on the poly(MA)/G electrodes surface using the electrodeposition method. These electrodes are characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy, and scanning electron microscopy-energy dispersive X-ray. Poly(MA) hydrogel and Pd-doped poly(MA) hydrogel are successfully prepared by the polymerization and further electrodeposition. Formic acid electro-oxidation (FAEO) activities are examined with cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Poly(MA)/G and Pd doped poly(MA) electrodes exhibit promising electro-catalytic activity with 60 mA current density, greater than literature values. Pd-doped poly(MA) hydrogel electrodes are promising electrodes for FAEO.
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    Article
    A Remarkable Synergic Effect of Poly (Acryclic Acid) Hydrogel Anchored Pd Catalysts in Formic Acid Electrooxidation Reaction
    (Health & Environment Assoc, 2022) Khalid, Sarwar; Kivrak, Hilal; Alpaslan, Duygu; Kaya, Sefika; Aktas, Nahit
    Polymer-based catalysts have never been used before as anode catalysts in direct formic acid fuel cells. At present, Poly (acrylic acid), Poly (AA) was prepared and electrodes were constructed on graphite pencil (G) from these hydrogels. Furthermore, Pd doped Poly (AA)/G electrodes were prepared by employing electrodeposition techniques, and their formic acid electrooxidation (FAEO) activities were examined via cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. These electrodes were characterized by DT-TGA, FTIR, and SEM-EDX. It was observed that Poly (AA)/G were prepared successfully. Poly (AA)/G electrode exhibited promising electrocatalytic activity as a DFAFC anode catalyst. By the modification with Pd, the FAEO activity increased for Poly (AA)/G with 38 mA/cm(2) current density, greater than literature values. In conclusion, it is clear that these Pd doped Poly (AA)/G electrodes have superior activity towards formic acid electrooxidation.