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<p>Layered perovskite oxides (A<sub>2</sub>BO<sub>4</sub>) are ideal for SOFC electrodes. This study explores B-site doping in La<sub>0.6</sub>Sr<sub>1.4</sub>Mn<sub>1−<i>x</i></sub>B<sub><i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0, 0.1, 0.2, 0.3; <i>B</i> = Ni, Fe) as a potential SOFC anode. X-ray diffraction analysis confirms the formation of a stable, impurity-free tetragonal phase. Electrochemical performance was tested in 4% H<sub>2</sub>/N<sub>2</sub>. (La<sub>0.6</sub>Sr<sub>1.4</sub>) Mn<sub>0.9</sub>Fe<sub>0.1</sub>O<sub>4</sub> shows the highest conductivity of 6.60 × 10<sup>−2</sup>&#xa0;S&#xa0;cm<sup>−1</sup> and the lowest ASR of 2.46&#xa0;Ω&#xa0;cm<sup>2</sup> at 800&#xa0;°C under reducing conditions. X-ray photoelectron spectroscopy indicates that Fe substitution enhances binding-energy shifts and mixed-valent cations, thereby improving B-site substitution and the electronic structure. Field-emission scanning electron microscopy reveals increased grain growth and electrocatalytic activity, driven by improved oxygen transport and reaction kinetics. Temperature-programmed reduction analysis indicates that Fe/Ni doping improves lattice oxygen reducibility and hydrogen oxidation kinetics. La<sub>0.6</sub>Sr<sub>1.4</sub>Mn<sub>0.9</sub>Fe<sub>0.1</sub>O<sub>4</sub> excels as an SOFC anode material due to balanced lattice expansion, mixed Mn<sup>3+</sup>/Mn<sup>4+</sup> and Fe<sup>3+</sup>/Fe<sup>4+</sup> redox pairs enhancing electronic and ionic transport, and a porous microstructure providing active sites for electrochemical reactions.</p>

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Impact of B-site substitution on the physicochemical properties of La0.6Sr1.4MnO4-layered perovskites

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Jinu John,
  • V. Prabhahari,
  • K. Suresh Babu

摘要

Layered perovskite oxides (A2BO4) are ideal for SOFC electrodes. This study explores B-site doping in La0.6Sr1.4Mn1−xBxO4 (x = 0, 0.1, 0.2, 0.3; B = Ni, Fe) as a potential SOFC anode. X-ray diffraction analysis confirms the formation of a stable, impurity-free tetragonal phase. Electrochemical performance was tested in 4% H2/N2. (La0.6Sr1.4) Mn0.9Fe0.1O4 shows the highest conductivity of 6.60 × 10−2 S cm−1 and the lowest ASR of 2.46 Ω cm2 at 800 °C under reducing conditions. X-ray photoelectron spectroscopy indicates that Fe substitution enhances binding-energy shifts and mixed-valent cations, thereby improving B-site substitution and the electronic structure. Field-emission scanning electron microscopy reveals increased grain growth and electrocatalytic activity, driven by improved oxygen transport and reaction kinetics. Temperature-programmed reduction analysis indicates that Fe/Ni doping improves lattice oxygen reducibility and hydrogen oxidation kinetics. La0.6Sr1.4Mn0.9Fe0.1O4 excels as an SOFC anode material due to balanced lattice expansion, mixed Mn3+/Mn4+ and Fe3+/Fe4+ redox pairs enhancing electronic and ionic transport, and a porous microstructure providing active sites for electrochemical reactions.