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<p>The development of proton exchange membrane fuel cells (PEMFCs) requires cost-effective, efficient, and durable electrocatalysts with reduced noble metal content. In this study, La<sub>2</sub>O<sub>3</sub> nanoparticles were synthesized via a green route using bean shell extract and employed as oxide supports for Pt-based cathode catalysts. Two catalyst structures, denoted as Pt–La<sub>2</sub>O<sub>3</sub>/C and Pt/La<sub>2</sub>O<sub>3</sub>–C, were prepared through a chemical reduction method. The structural, morphological, and compositional properties of the catalysts were systematically characterized using XRD, XPS, TEM, SEM, and EDX. Electrochemical analyses revealed that the Pt–La<sub>2</sub>O<sub>3</sub>/C catalyst exhibited a higher electrochemically active surface area (137 m<sup>2</sup>gPt<sup>− 1</sup>) and improved electrochemical performance compared to Pt/La<sub>2</sub>O<sub>3</sub>–C (118 m<sup>2</sup>gPt<sup>− 1</sup>). PEMFC performance tests conducted at 70&#xa0;°C demonstrated that Pt–La<sub>2</sub>O<sub>3</sub>/C achieved a maximum current density of 397 mAcm<sup>− 2</sup>, outperforming Pt/La<sub>2</sub>O<sub>3</sub>–C (269 mAcm<sup>− 2</sup>), despite employing a lower platinum loading. Furthermore, durability assessments showed that the Pt–La<sub>2</sub>O<sub>3</sub>/C catalyst retained approximately 78% of its initial activity after 1000 electrochemical cycles. These results demonstrate that La<sub>2</sub>O<sub>3</sub>-supported Pt catalysts can enhance PEMFC performance while reducing platinum usage, providing a promising strategy for the development of cost-effective fuel cell cathodes.</p> Graphical Abstract <p></p>

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High PEMFC performance at reduced platinum loadings using La2O3-supported catalysts synthesized via a green route from agricultural waste extracts

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月28日

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  • Orhan Baytar,
  • Abdurrahman Akdag,
  • Ömer Şahin,
  • Arzu Ekinci,
  • Gurbet Canpolat

摘要

The development of proton exchange membrane fuel cells (PEMFCs) requires cost-effective, efficient, and durable electrocatalysts with reduced noble metal content. In this study, La2O3 nanoparticles were synthesized via a green route using bean shell extract and employed as oxide supports for Pt-based cathode catalysts. Two catalyst structures, denoted as Pt–La2O3/C and Pt/La2O3–C, were prepared through a chemical reduction method. The structural, morphological, and compositional properties of the catalysts were systematically characterized using XRD, XPS, TEM, SEM, and EDX. Electrochemical analyses revealed that the Pt–La2O3/C catalyst exhibited a higher electrochemically active surface area (137 m2gPt− 1) and improved electrochemical performance compared to Pt/La2O3–C (118 m2gPt− 1). PEMFC performance tests conducted at 70 °C demonstrated that Pt–La2O3/C achieved a maximum current density of 397 mAcm− 2, outperforming Pt/La2O3–C (269 mAcm− 2), despite employing a lower platinum loading. Furthermore, durability assessments showed that the Pt–La2O3/C catalyst retained approximately 78% of its initial activity after 1000 electrochemical cycles. These results demonstrate that La2O3-supported Pt catalysts can enhance PEMFC performance while reducing platinum usage, providing a promising strategy for the development of cost-effective fuel cell cathodes.

Graphical Abstract