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<p>In this study, SmBaCo<sub>2x</sub>Fe<sub>2(1-x)</sub>O<sub>5+δ</sub> (SBCF) cathodes with varying compositions (<i>x</i> = 0.1, 0.3, 0.5, 0.7, and 0.9) were synthesized via a conventional solid-state reaction method and systematically investigated for application in Intermediate Temperature-operating solid oxide fuel cells (IT-SOFCs). Phase purity and structural evolution were confirmed by X-ray diffraction (XRD), and electrochemical properties including electrical conductivity and area-specific resistance (ASR) were evaluated to assess the effect of composition. Scanning electron microscopy (SEM) was employed to analyze the microstructure and its correlation with electrochemical performance. All compositions with a Co substitution ratio of <i>x</i> ≥ 0.7 met the minimum electrical conductivity requirement of 100 S/cm. Notably, the SBCF 1.8-0.2_1200 (<i>x</i> = 0.9) exhibited the highest electrical conductivity of 764.99 S/cm at 300&#xa0;°C in air. Surface microstructural analysis confirmed grain growth with increased heat-treatment temperature, with SBCF 1.8-0.2_1200 exhibiting the largest average grain size of around 4.68&#xa0;μm. Moreover, a composite cathode formed by mixing SBCF 1.8-0.2_1100 with CGO91 in a 1:1 ratio exhibited the lowest area-specific resistance (ASR) of 0.06 Ω·cm<sup>2</sup> at 700&#xa0;°C, which was attributed to the enhanced ion transport, reduced thermal expansion mismatch, and an extended triple-phase boundary (TPB). These results demonstrate that SBCF 1.8-0.2 is a promising cathode composition for IT-SOFC applications and provide valuable insight into compositional design strategies for high-performance SOFC cathodes.</p>

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Electrical conductivity and electrochemical characteristics of layered perovskite cathodes with Co and Fe substitution

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Yu Taek Hong,
  • Jeong Yun Park,
  • Yu Ri Lim,
  • Jin Woo Cha,
  • Chae Eun Kim,
  • Jun Woong Kim,
  • Abul K. Azad,
  • Seung-Wook Baek,
  • Jung Hyun Kim

摘要

In this study, SmBaCo2xFe2(1-x)O5+δ (SBCF) cathodes with varying compositions (x = 0.1, 0.3, 0.5, 0.7, and 0.9) were synthesized via a conventional solid-state reaction method and systematically investigated for application in Intermediate Temperature-operating solid oxide fuel cells (IT-SOFCs). Phase purity and structural evolution were confirmed by X-ray diffraction (XRD), and electrochemical properties including electrical conductivity and area-specific resistance (ASR) were evaluated to assess the effect of composition. Scanning electron microscopy (SEM) was employed to analyze the microstructure and its correlation with electrochemical performance. All compositions with a Co substitution ratio of x ≥ 0.7 met the minimum electrical conductivity requirement of 100 S/cm. Notably, the SBCF 1.8-0.2_1200 (x = 0.9) exhibited the highest electrical conductivity of 764.99 S/cm at 300 °C in air. Surface microstructural analysis confirmed grain growth with increased heat-treatment temperature, with SBCF 1.8-0.2_1200 exhibiting the largest average grain size of around 4.68 μm. Moreover, a composite cathode formed by mixing SBCF 1.8-0.2_1100 with CGO91 in a 1:1 ratio exhibited the lowest area-specific resistance (ASR) of 0.06 Ω·cm2 at 700 °C, which was attributed to the enhanced ion transport, reduced thermal expansion mismatch, and an extended triple-phase boundary (TPB). These results demonstrate that SBCF 1.8-0.2 is a promising cathode composition for IT-SOFC applications and provide valuable insight into compositional design strategies for high-performance SOFC cathodes.