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<p>Protonic ceramic fuel cells (PCFCs) should exhibit high performance at intermediate temperatures in the range of 400–600 °C. To reduce the operating temperature, more active air electrodes (positrodes) are needed. In the present work, BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Mg<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-<i>δ</i></sub> (BCFMY) is investigated as a positrode material for application in PCFCs as well as solid oxide fuel cells (SOFCs). For SOFCs, the polarization resistance ascribed to the oxygen reduction reaction is proportional to <i>p</i><sub>O2</sub><sup>−1/4</sup> (<i>p</i><sub>O2</sub>: oxygen partial pressure), suggesting that the rate-determining process is the charge transfer on the mixed ionic-electronic conductors. For PCFCs, this polarization resistance is proportional to <i>p</i><sub>O2</sub><sup>−</sup><sup>1/2</sup>, suggesting that the rate-determining process is the oxygen dissociation. The total polarization resistance for the PCFCs using the BCFMY positrode is 0.066 Ωcm<sup>2</sup> at 600 °C, lower than that using the BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-<i>δ</i></sub> (BCFZY) positrode. The higher oxygen nonstoichiometry of BCFMY promotes the oxygen dissociation process on the PCFC positrode surface.</p><p></p>

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Oxygen reduction kinetics of high performance BaCo0.4Fe0.4M0.1Y0.1O3-δ (M = Mg, Zr) positrode for protonic ceramic fuel cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月8日

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  • Hirofumi Sumi,
  • Konosuke Watanabe,
  • Aman Sharma,
  • Masaya Fujioka,
  • Hiroyuki Shimada,
  • Yasunobu Mizutani,
  • Md Saiful Alam,
  • Isao Kagomiya

摘要

Protonic ceramic fuel cells (PCFCs) should exhibit high performance at intermediate temperatures in the range of 400–600 °C. To reduce the operating temperature, more active air electrodes (positrodes) are needed. In the present work, BaCo0.4Fe0.4Mg0.1Y0.1O3-δ (BCFMY) is investigated as a positrode material for application in PCFCs as well as solid oxide fuel cells (SOFCs). For SOFCs, the polarization resistance ascribed to the oxygen reduction reaction is proportional to pO2−1/4 (pO2: oxygen partial pressure), suggesting that the rate-determining process is the charge transfer on the mixed ionic-electronic conductors. For PCFCs, this polarization resistance is proportional to pO2−1/2, suggesting that the rate-determining process is the oxygen dissociation. The total polarization resistance for the PCFCs using the BCFMY positrode is 0.066 Ωcm2 at 600 °C, lower than that using the BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY) positrode. The higher oxygen nonstoichiometry of BCFMY promotes the oxygen dissociation process on the PCFC positrode surface.