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J. Korean Ceram. Soc. > Volume 59(2); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(2): 217-223.
doi: https://doi.org/10.1007/s43207-021-00169-7
Electrochemical properties of Ba0.5Sr0.5Co0.8Fe0.2O3 and BaZr0.65Ce0.20Y0.15O3 composite cathodes on Y-doped barium–cerium–zirconium oxide solid electrolyte
Jun Seo1, Hye-Won Kim2,3, Ji Haeng Yu2, Hee Jung Park1
1Department of Materials Science and Engineering, Dankook University, 119 Dandae-ro, Cheonan 31116, Korea
2Korea Institute of Energy Research (KIER) , 152 Gajeong-ro , Daejeon   34101 , Korea
3Department of Materials Science and Engineering , Yonsei University , Seoul   03722 , Korea
Correspondence  Hee Jung Park ,Email: parkjang@dankook.ac.kr
Received: August 4, 2021; Revised: October 21, 2021   Accepted: November 23, 2021.  Published online: March 31, 2022.
Various Ba0.5Sr0.5Co0.8Fe0.2O3–BaZr0.65Ce0.20Y0.15O3 composites have been prepared for cathode materials for intermediate-temperature solid oxide fuel cells. Their electrochemical properties on a barium–zirconium-cerate solid electrolyte have been investigated using 2-probe ac impedance measurement. Impedance spectra are measured to investigate their cathodic polarization resistances in cells in a symmetric configuration. The Ba0.5Sr0.5Co0.8Fe0.2O3–BaZr0.65Ce0.20Y0.15O3 composite fired at 900 °C shows low polarization resistance of ~ 0.16 Ωᜃcm 2 at 700 °C, which is an improved value over the Ba0.5Sr0.5Co0.8Fe0.2O3 due to enhanced ionic conduction.
Key words: Composite cathode  · Protonic conducting solid electrolyte  · Impedance spectroscopy  · Cathodic polarization resistance
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