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<p>Developing cathodes with low activation energy and accelerated oxygen reduction kinetics remains a primary goal in solid oxide fuel cells (SOFCs). In the present study, a cobalt-free perovskite system, Sr<sub>0.75</sub>Ca<sub>0.25</sub>Fe<sub>1-x</sub>Ni<sub>x</sub>O<sub>3-δ</sub> (x = 0, 0.1, 0.2, 0.3), was investigated to improve the oxygen reduction reaction (ORR) activity. Nickel incorporation facilitated the formation of a cubic perovskite structure; however, secondary phases emerged at a higher substitution level (x = 0.3). X-ray photoelectron spectroscopy confirmed the coexistence of mixed valence states of Fe (Fe<sup>4+/3+/2+</sup>) and Ni (Ni<sup>3+/2+</sup>). Further, studies including temperature programmed desorption revealed that the composition with x = 0.2 exhibited the highest adsorbed to lattice oxygen ratio, superior oxygen transport capability, and pronounced oxygen desorption. Electrochemical measurements demonstrated an area-specific resistance of 0.15 Ω cm<sup>2</sup> in wet air (3% H<sub>2</sub>O) at 700&#xa0;°C, comparable to the lowest values reported for cobalt-free cathode. This reduced resistance suggests improved protonic conduction, highlighting this material's potential as a promising candidate for proton conducting SOFCs.</p> Graphical Abstract <p></p>

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Electrical and electrochemical investigation of Ni-incorporated Sr0.75Ca0.25FeO3-δ for enhancing oxygen reduction reaction

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Shivapriya Ilangovan,
  • K. Suresh Babu

摘要

Developing cathodes with low activation energy and accelerated oxygen reduction kinetics remains a primary goal in solid oxide fuel cells (SOFCs). In the present study, a cobalt-free perovskite system, Sr0.75Ca0.25Fe1-xNixO3-δ (x = 0, 0.1, 0.2, 0.3), was investigated to improve the oxygen reduction reaction (ORR) activity. Nickel incorporation facilitated the formation of a cubic perovskite structure; however, secondary phases emerged at a higher substitution level (x = 0.3). X-ray photoelectron spectroscopy confirmed the coexistence of mixed valence states of Fe (Fe4+/3+/2+) and Ni (Ni3+/2+). Further, studies including temperature programmed desorption revealed that the composition with x = 0.2 exhibited the highest adsorbed to lattice oxygen ratio, superior oxygen transport capability, and pronounced oxygen desorption. Electrochemical measurements demonstrated an area-specific resistance of 0.15 Ω cm2 in wet air (3% H2O) at 700 °C, comparable to the lowest values reported for cobalt-free cathode. This reduced resistance suggests improved protonic conduction, highlighting this material's potential as a promising candidate for proton conducting SOFCs.

Graphical Abstract