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<p>The development of cobalt free electrodes with sufficient reaction kinetics and hydration capability is crucial for proton conducting solid oxide fuel cells. In this study, Sr<sub>0.5</sub>Ba<sub>0.5</sub>Fe<sub>1−x</sub>Ni<sub>x</sub>O<sub>3−δ</sub> (SBFNO, x = 0, 0.1, 0.2, 0.3) was investigated as a cobalt-free cathode through a systematic evaluation of its phase structure, oxygen vacancy characteristics, and electrochemical performance. Structural analysis confirmed the retention of the cubic perovskite structure up to x = 0.2, while secondary phases emerged at higher Ni contents. X-ray photoelectron spectroscopy revealed the mixed valence states of the transition metal cations (Fe<sup>4+/3+/2+</sup> and Ni<sup>3+/2+</sup>), and the O1s spectra indicated an increased proportion of adsorbed oxygen for x = 0.2. Furthermore, oxygen temperature-programmed desorption (O<sub>2</sub>-TPD) measurements revealed the largest desorption area for this composition, indicating enhanced oxygen adsorption associated with oxygen vacancies. Among the investigated compositions, Sr<sub>0.5</sub>Ba<sub>0.5</sub>Fe<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3−δ</sub> exhibited the highest electrical conductivity, with area specific resistances of 0.25 Ω cm<sup>2</sup> in ambient air and 0.12 Ω cm<sup>2</sup> in wet air (3% H<sub>2</sub>O) at 700&#xa0;°C. These findings suggest that optimal Ni doping may promote protonic conduction in proton conducting oxide fuel cells.</p>

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Tailoring the structural and electrochemical properties of Sr0.5Ba0.5FeO3−δ electrodes via Ni doping for solid oxide fuel cells

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Shivapriya Ilangovan,
  • K. Suresh Babu

摘要

The development of cobalt free electrodes with sufficient reaction kinetics and hydration capability is crucial for proton conducting solid oxide fuel cells. In this study, Sr0.5Ba0.5Fe1−xNixO3−δ (SBFNO, x = 0, 0.1, 0.2, 0.3) was investigated as a cobalt-free cathode through a systematic evaluation of its phase structure, oxygen vacancy characteristics, and electrochemical performance. Structural analysis confirmed the retention of the cubic perovskite structure up to x = 0.2, while secondary phases emerged at higher Ni contents. X-ray photoelectron spectroscopy revealed the mixed valence states of the transition metal cations (Fe4+/3+/2+ and Ni3+/2+), and the O1s spectra indicated an increased proportion of adsorbed oxygen for x = 0.2. Furthermore, oxygen temperature-programmed desorption (O2-TPD) measurements revealed the largest desorption area for this composition, indicating enhanced oxygen adsorption associated with oxygen vacancies. Among the investigated compositions, Sr0.5Ba0.5Fe0.8Ni0.2O3−δ exhibited the highest electrical conductivity, with area specific resistances of 0.25 Ω cm2 in ambient air and 0.12 Ω cm2 in wet air (3% H2O) at 700 °C. These findings suggest that optimal Ni doping may promote protonic conduction in proton conducting oxide fuel cells.