Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Facile Combustion Synthesis Route for Performance Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) as a Robust Cathode Material for IT-SOFC

  • Yoo, Young-Sung (Energy Storage Group, New and Renewable Energy Laboratory, Korea Electric Power Corporation (KEPCO) Research Institute) ;
  • Namgung, Yeon (School of Materials Science and Engineering, Chonnam National University) ;
  • Bhardwaj, Aman (School of Materials Science and Engineering, Chonnam National University) ;
  • Song, Sun-Ju (School of Materials Science and Engineering, Chonnam National University)
  • Received : 2019.07.31
  • Accepted : 2019.08.12
  • Published : 2019.09.30
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Abstract

Lanthanum-based transition metal cations containing perovskites have emerged as potential catalysts for the intermediate-temperature (600-800℃) oxygen reduction reaction (ORR). Here, we report a facile acetylacetone-assisted combustion route for the synthesis of nanostructured La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) cathodes for intermediate-temperature solid-oxide fuel cells (IT-SOFCs). The as-prepared powder was analyzed by thermogravimetry analysis-differential scanning calorimetry. The powder calcined at 800℃ was characterized by X-ray diffraction, scanning electrode microscopy, energy dispersive X-ray spectroscopy, and Brunauer-Emmett-Teller surface area measurements. It was found that the porosity of the air electrode significantly increased by utilizing the nanostructured LSCF6428 instead of commercial powder. The performance of a single cell fabricated with the nanostructured LSCF6428 cathode increased by 112%, from 0.4 to 0.85 W cm-2, at 700℃. Electrochemical impedance spectroscopy showed a considerable reduction in the area-specific resistance and activation energy from 133.5 to 61.5 kJ/mol, resulting in enhanced electrocatalytic activity toward ORR and overall cell performance.

Keywords

References

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