Abstract
La0.8Sr0.2Mn1−xScxO3−δ perovskite oxides (x = 0.00, 0.05, 0.10, 0.15) were systematically examined as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). This study encompassed structural attributes, temperature-dependent weight variations, the electrical conductivity of La0.8Sr0.2Mn1−xScxO3−δ compositions, and the single-cell electrochemical performance of La0.8Sr0.2Mn1−xScxO3−δ on yttria-stabilized zirconia (YSZ). Further characterizations were carried out through powder X-ray diffraction (XRD), thermogravimetric analysis, DC four-probe method, and impedance spectroscopy, respectively. The X-ray diffraction (XRD) analysis revealed a clear correlation between the increase in Sc3+ content at the B-site and an increase in both the lattice parameter and lattice volume. The electrical conductivity of La0.8Sr0.2Mn1−xScxO3−δ compounds at 750 °C were found to be 137.941, 198.07, 119.789, and 61.036 S cm−1 for x = 0.00, x = 0.05, x = 0.10, and x = 0.15, respectively. When combined with YSZ in a single cell, the area-specific resistances for La0.8Sr0.2Mn1−xScxO3−δ were varied between 0.56 and 2.2 Ω cm2. La0.8Sr0.2Mn0.95Sc0.05O3−δ exhibited enhanced electrocatalytic activity, with an exchange current density of 39.35 mA cm−2 at 750 °C suggesting the composition as a potential candidate for cathode material in IT-SOFC.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors would like to thank the Central Instrumentation Facility (CIF), Birla Institute of Technology, Mesra, for providing the necessary infrastructure for our research. We gratefully acknowledge Prof. S. K. Rout and B. K. Sonu for their overall support and valuable time. The authors deeply appreciate Prof. S. K. Pratihar, Department of Ceramic Engineering, National Institute of Technology, Rourkela, Odisha, India, for providing the necessary facilities for the DC four-probe experiment.
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Dash, G., Rout, E. Investigation of structural, electrical and electrochemical properties of La0.8Sr0.2Mn1−xScxO3−δ as cathode on yttria-stabilized zirconia electrolyte for intermediate temperature solid oxide fuel cell fabricated by one step dry pressing method. J Mater Sci: Mater Electron 35, 491 (2024). https://doi.org/10.1007/s10854-024-12224-0
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DOI: https://doi.org/10.1007/s10854-024-12224-0