Yazar "Abdurrahman Akdag" seçeneğine göre listele

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    Öğe
    Applications of Environmentally Friendly Metal Oxides as PEM Fuel Cell Cathode Catalysts
    (Springer Science and Business Media LLC, 2025-04-10) Orhan Baytar; Ömer Şahin; Abdurrahman Akdag; Gurbet Canpolat; Arzu Ekinci
    For the first time, this study investigated the behaviors of CuO and FeO metal oxides synthesized from bean shell extract using an environmentally friendly green synthesis method at varying cell temperatures in PEMFCs according to the amount of Pt used. Analyzed techniques such as XRD, SEM–EDX, TEM, and XPS were used to ascertain the structural and morphological characteristics of the produced catalysts. The performance of the catalysts was evaluated based on the voltage-current density values obtained from PEMFCs at different cell temperatures and increased at higher cell temperatures.At a cell temperature of 70 °C, the Pt-FeO/C and Pt-CuO/C catalysts exhibited higher power values than the Pt/FeO-C and Pt/CuO-C catalysts, containing only half the amount per unit area. The power density values for catalysts were tested as follows: 3380 mW/cm2mgPt for Pt-FeO/C, 1697 mW/cm2mgPt for Pt-CuO/C, 919 mW/cm2mgPt for Pt/FeO-C, and 1264 mW/cm2mgPt for Pt/CuO-C, and these values were determined to be higher than the values measured using the Pt/C (431 mW/cm2mgPt) catalyst. According to the measured current density-power density values, It was determined that the performances of the catalysts were Pt/FeO-C > Pt-CuO/C > Pt/CuO-C > Pt-FeO/C.
  • [ X ]
    Öğe
    Green-synthesized ZrFeO nanoparticles as efficient cathode materials in PEM fuel cells
    (Elsevier BV, 2025-01) Suna Tarhan; Arzu Ekinci; Orhan Baytar; Abdurrahman Akdag; Ömer Şahin
    This study explores the application of ZrFeO nanoparticles, synthesized from fig leaf extract through a green synthesis method, as cathode materials for PEM fuel cells. The nanoparticles, doped with FeO and varying Zr ratios, were combined with Pt metal and characterized using XRD, SEM, EDX, and TEM to analyze their structural and morphological properties. The particle sizes for FeO and Zr-doped FeO were determined to be 2 nm and 2.5 nm, respectively. The electrochemical active surface areas of the catalysts—Pt-FeO/C and Zr-doped variants (PtFeO/C-1 wt%Zr, PtFeO/C-5 wt%Zr, and PtFeO/C-10 wt%Zr)—were measured as 97, 154, 138, and 119 m2/gPt, respectively, demonstrating a significant enhancement in surface area with the incorporation of Zr at optimal doping levels. Catalyst retention after 250 cycles was 29% for Pt–FeO/C, 60% for 1 wt% Zr-doped Pt–ZrFeO/C, 93% for 5 wt% Zr-doped Pt–ZrFeO, and 71% for 10 wt% Zr-doped Pt–ZrFeO. Performance testing at 70 °C revealed a hierarchy of catalytic activity: Pt–ZrFeO/C > Pt–FeO/C > Pt/C. The findings highlight the potential of green-synthesized ZrFeO nanoparticles as effective support materials for cathode catalysts, offering improved performance in PEM fuel cells while markedly reducing platinum dependency. This innovative approach integrates environmental sustainability with technological progress in fuel cell applications.