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<p>This study systematically investigates the effect of yttria-stabilized zirconia (YSZ) doping levels on the oxygen reduction reaction (ORR) kinetics of Pt cathodes interfaced with samaria-doped ceria (SDC) at 500&#xa0;°C. Using atomic layer deposition (ALD), nanoscale thin YSZ layers with precisely controlled Y<sub>2</sub>O<sub>3</sub> doping concentrations (0, 7, 14, 20, and 30&#xa0;mol%) were fabricated on Pt electrodes. Among these compositions, the 14&#xa0;mol% YSZ coating delivered the most significant ORR activity enhancement, exhibiting a polarization resistance of 20–25 Ω. This was approximately twice the rate of the 7&#xa0;mol% YSZ-coated Pt cathode (44–50 Ω) and consistently outperformed undoped, 20&#xa0;mol%, and 30&#xa0;mol% YSZ samples. This optimized doping level not only accelerated ORR kinetics but also improved cathode stability by minimizing Pt agglomeration at low-temperature operations below 500&#xa0;°C. These findings offer valuable insights for designing high-performance cathodes in low-temperature solid oxide fuel cell (LT-SOFC) applications.</p>

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Optimizing YSZ Doping on Nanoporous Pt Cathodes for Enhanced Oxygen Reduction Reaction at 500 °C

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Taehee Lee,
  • Doyoon Kim,
  • Jae-Hun Jeong,
  • Jong Dae Baek,
  • Ikwhang Chang

摘要

This study systematically investigates the effect of yttria-stabilized zirconia (YSZ) doping levels on the oxygen reduction reaction (ORR) kinetics of Pt cathodes interfaced with samaria-doped ceria (SDC) at 500 °C. Using atomic layer deposition (ALD), nanoscale thin YSZ layers with precisely controlled Y2O3 doping concentrations (0, 7, 14, 20, and 30 mol%) were fabricated on Pt electrodes. Among these compositions, the 14 mol% YSZ coating delivered the most significant ORR activity enhancement, exhibiting a polarization resistance of 20–25 Ω. This was approximately twice the rate of the 7 mol% YSZ-coated Pt cathode (44–50 Ω) and consistently outperformed undoped, 20 mol%, and 30 mol% YSZ samples. This optimized doping level not only accelerated ORR kinetics but also improved cathode stability by minimizing Pt agglomeration at low-temperature operations below 500 °C. These findings offer valuable insights for designing high-performance cathodes in low-temperature solid oxide fuel cell (LT-SOFC) applications.