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Activating the phase transformation of double perovskite materials via controlling the crystal defect concentration for symmetric solid oxide cells
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  • Hyejin Jeon,
  • Hyeongwon Jeong,
  • Yo Han Kim,
  • Chan-ho Park,
  • Bo-Ram Won,
  • Tae Ho Shin,
  • Jae-ha Myung
Hyejin Jeon
Incheon National University
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Hyeongwon Jeong
Incheon National University
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Yo Han Kim
Incheon National University
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Chan-ho Park
Incheon National University
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Bo-Ram Won
Incheon National University
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Tae Ho Shin
Korea Institute of Ceramic Engineering and Technology

Corresponding Author:[email protected]

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Jae-ha Myung
Incheon National University
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Abstract

Double perovskite (DP) oxides are promising electrode materials for symmetric solid oxide cells (SSOCs) due to their excellent electrochemical activity and redox reversibility. B-site cation doping affects their phase transformation and exsolution properties, which are crucial for catalyst activation, yet there are few studies. In this study, the Sr2Fe1.5-xCoxMo0.5O6-δ (x= 0, 0.1, 0.3, 0.5) DP system demonstrates modulated phase transition properties by manipulating the oxygen vacancy concentration. The correlation between Co-doping level and oxygen vacancy concentration is investigated to optimize the phase transformation and exsolution properties. Sr2Fe1.2Co0.3Mo0.5O6-δ high density of exsolved CoFe alloy nanoparticles with good phase stability, and excellent peak power density of 1.27 W cm-2 (at 850 °C under H2 fuel cell mode) and current density of 2.33 A cm-2 (at 1.6 V, 800 °C under H2O electrolysis mode). These results demonstrate a significant role of B-site doping in designing nanostructured DP materials for high-performed catalysts.