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<p>In this study, Sr-doped SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> oxide was prepared, and its electrochemical performance stability as a cathode for solid oxide fuel cells were investigated. First principles calculations indicated that the oxygen vacancy formation energy of SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> (1.998&#xa0;eV) was lower than that of parent SmBaFe<sub>2</sub>O<sub>5+δ</sub> (2.098&#xa0;eV). Sr-doped SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> exhibited a significant reduction in the band center energy of Fe–3d and O–2p orbits and improved conductivity compared with parent SBF material. SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> cathode had good chemical and thermal compatibility with common oxygen-ion conducting electrolyte materials in the intermediate temperature range. At 800&#xa0;°C, the polarization resistance of SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> on Sm<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>1.9</sub> and La<sub>0.9</sub>Sr<sub>0.1</sub>Ga<sub>0.83</sub>Mg<sub>0.17</sub>O<sub>3−δ</sub> electrolyte were 0.025 Ω, and 0.018 Ω cm<sup>2</sup> in air, respectively. The polarization resistance of SmBaFe<sub>2</sub>O<sub>5+δ</sub> on Sm<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>1.9</sub> and La<sub>0.9</sub>Sr<sub>0.1</sub>Ga<sub>0.83</sub>Mg<sub>0.17</sub>O<sub>3−δ</sub> electrolyte were 0.064, and 0.046 Ω cm<sup>2</sup> in air, respectively. The polarization resistance of Sr-doped SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> was decreased significantly by 61% compared with SmBaFe<sub>2</sub>O<sub>5+δ</sub>. At 800&#xa0;°C, the maximum power density of fuel cell using SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ,</sub> SmBaFe<sub>2</sub>O<sub>5+δ</sub> as cathode and La<sub>0.9</sub>Sr<sub>0.1</sub>Ga<sub>0.83</sub>Mg<sub>0.17</sub>O<sub>3−δ</sub> as electrolyte reached 758.6 and 670.2 mW cm<sup>−2</sup>, respectively. The polarization resistance growth ratio of SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> was only 7.5% within 100&#xa0;h compared with SmBaFe<sub>2</sub>O<sub>5+δ</sub>. Sr-doped SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> significantly improved the stability of polarization resistance in air. These results demonstrated that Sr-doped SmBa<sub>0.75</sub>Sr<sub>0.25</sub>Fe<sub>2</sub>O<sub>5+δ</sub> exhibited good electrochemical performance and stability as a cathode material for intermediate temperature solid oxide fuel cells.</p> Graphical abstract <p></p>

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Preparation and evaluation of a stable SmBa0.75Sr0.25Fe2O5+δ cathode material for solid oxide fuel cells

  • 期刊论文

  • 发表日期：

    2025年3月2日

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  • Yunfei Li,
  • Ru Song,
  • Aoye Li,
  • Dongchao Qiu,
  • Bingbing Niu,
  • Biao Wang

摘要

In this study, Sr-doped SmBa0.75Sr0.25Fe2O5+δ oxide was prepared, and its electrochemical performance stability as a cathode for solid oxide fuel cells were investigated. First principles calculations indicated that the oxygen vacancy formation energy of SmBa0.75Sr0.25Fe2O5+δ (1.998 eV) was lower than that of parent SmBaFe2O5+δ (2.098 eV). Sr-doped SmBa0.75Sr0.25Fe2O5+δ exhibited a significant reduction in the band center energy of Fe–3d and O–2p orbits and improved conductivity compared with parent SBF material. SmBa0.75Sr0.25Fe2O5+δ cathode had good chemical and thermal compatibility with common oxygen-ion conducting electrolyte materials in the intermediate temperature range. At 800 °C, the polarization resistance of SmBa0.75Sr0.25Fe2O5+δ on Sm0.2Ce0.8O1.9 and La0.9Sr0.1Ga0.83Mg0.17O3−δ electrolyte were 0.025 Ω, and 0.018 Ω cm2 in air, respectively. The polarization resistance of SmBaFe2O5+δ on Sm0.2Ce0.8O1.9 and La0.9Sr0.1Ga0.83Mg0.17O3−δ electrolyte were 0.064, and 0.046 Ω cm2 in air, respectively. The polarization resistance of Sr-doped SmBa0.75Sr0.25Fe2O5+δ was decreased significantly by 61% compared with SmBaFe2O5+δ. At 800 °C, the maximum power density of fuel cell using SmBa0.75Sr0.25Fe2O5+δ, SmBaFe2O5+δ as cathode and La0.9Sr0.1Ga0.83Mg0.17O3−δ as electrolyte reached 758.6 and 670.2 mW cm−2, respectively. The polarization resistance growth ratio of SmBa0.75Sr0.25Fe2O5+δ was only 7.5% within 100 h compared with SmBaFe2O5+δ. Sr-doped SmBa0.75Sr0.25Fe2O5+δ significantly improved the stability of polarization resistance in air. These results demonstrated that Sr-doped SmBa0.75Sr0.25Fe2O5+δ exhibited good electrochemical performance and stability as a cathode material for intermediate temperature solid oxide fuel cells.

Graphical abstract