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<p>In this study, the electrochemical performance of Fe<sub>3</sub>O<sub>4</sub>-supported Pt/C catalysts was evaluated in a Proton exchange membrane fuel cell (PEMFC), with a focus on enhancing oxygen reduction reaction (ORR) kinetics. Fe<sub>3</sub>O<sub>4</sub> nanoparticles reduced catalyst particle sizes and improved structural stability. Among the catalysts tested—Pt-Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticle (MNP)/C, Pt/ Fe<sub>3</sub>O<sub>4</sub> MNP-C, and Pt/ Fe<sub>3</sub>O<sub>4</sub> activated carbon sphere (ACS)-C—the Pt/ Fe<sub>3</sub>O<sub>4</sub> MNP-C variant achieved the highest power density (215&#xa0;mW/cm<sup>2</sup> at 346&#xa0;mA/cm<sup>2</sup>) and displayed superior activity. Analytical techniques such as XRD, SEM–EDX, and TEM confirmed the superior crystallinity and phase purity of the Pt/ Fe<sub>3</sub>O<sub>4</sub>-based catalysts. Particle sizes were found to be 3.16&#xa0;nm, 2.71&#xa0;nm, and 4.70&#xa0;nm, respectively, for Pt-Fe<sub>3</sub>O<sub>4</sub> MNP/C, Pt/ Fe<sub>3</sub>O<sub>4</sub> MNP-C, and Pt/Fe<sub>3</sub>O<sub>4</sub> ACS-C. The high ORR activity of Pt/Fe<sub>3</sub>O<sub>4</sub> MNP-C is attributed to the high surface area and conductivity provided by activated carbon spheres, alongside enhanced Pt-Fe<sub>3</sub>O<sub>4</sub> interactions. Mass activities were recorded at 2829, 2307, and 1893&#xa0;mA/mg<sub>Pt</sub>, with Pt-Fe<sub>3</sub>O<sub>4</sub> MNP/C showing the fastest kinetics and highest efficiency. Pt/ Fe<sub>3</sub>O<sub>4</sub> MNP-C emerges as a promising low-platinum, high-efficiency electrocatalyst for PEMFCs, marking a significant step toward sustainable fuel cell technologies.</p>

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Enhanced Performance of Proton Exchange Membrane Fuel Cells Using Platinum–Iron Oxide Catalysts Supported on Activated Carbon Spheres

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Arzu Ekinci,
  • Abdurrahman Akdag,
  • Kaan Büyükkanber,
  • Ömer Şahin

摘要

In this study, the electrochemical performance of Fe3O4-supported Pt/C catalysts was evaluated in a Proton exchange membrane fuel cell (PEMFC), with a focus on enhancing oxygen reduction reaction (ORR) kinetics. Fe3O4 nanoparticles reduced catalyst particle sizes and improved structural stability. Among the catalysts tested—Pt-Fe3O4 magnetic nanoparticle (MNP)/C, Pt/ Fe3O4 MNP-C, and Pt/ Fe3O4 activated carbon sphere (ACS)-C—the Pt/ Fe3O4 MNP-C variant achieved the highest power density (215 mW/cm2 at 346 mA/cm2) and displayed superior activity. Analytical techniques such as XRD, SEM–EDX, and TEM confirmed the superior crystallinity and phase purity of the Pt/ Fe3O4-based catalysts. Particle sizes were found to be 3.16 nm, 2.71 nm, and 4.70 nm, respectively, for Pt-Fe3O4 MNP/C, Pt/ Fe3O4 MNP-C, and Pt/Fe3O4 ACS-C. The high ORR activity of Pt/Fe3O4 MNP-C is attributed to the high surface area and conductivity provided by activated carbon spheres, alongside enhanced Pt-Fe3O4 interactions. Mass activities were recorded at 2829, 2307, and 1893 mA/mgPt, with Pt-Fe3O4 MNP/C showing the fastest kinetics and highest efficiency. Pt/ Fe3O4 MNP-C emerges as a promising low-platinum, high-efficiency electrocatalyst for PEMFCs, marking a significant step toward sustainable fuel cell technologies.