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High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia YSZ Scaffolds by In Situ Carbon Templating Xerogels
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Nanostructured Double Perovskite Cathode With Low Sintering Temperature For Intermediate Temperature Solid Oxide Fuel

Seona Kim1, Areum Jun1, Ohhun Kwon1

  • 1Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.

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|August 1, 2015
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Summary

Researchers enhanced solid oxide fuel cell performance by optimizing cathode materials. A novel composite cathode significantly reduced resistance, boosting power density for efficient energy conversion.

Keywords:
energy conversionfuel cellsnanoparticlesnanostructuresperovskite phases

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Intermediate temperature solid oxide fuel cells (IT-SOFCs) require efficient cathode materials to reduce polarization resistance.
  • Mixed ionic electronic conductors (MIECs) offer potential for improved electrochemical performance.

Purpose of the Study:

  • To reduce cathode polarization resistance in IT-SOFCs.
  • To optimize cathode microstructure for increased electrochemically active sites.
  • To evaluate the performance of a novel composite cathode material.

Main Methods:

  • Selection of layered perovskite GdBa0.5 Sr0.5 CoFeO5+δ (GBSCF) as a MIEC cathode material.
  • Preparation of a GBSCF-yttria-stabilized zirconia (YSZ) composite cathode via infiltration.
  • Optimization of sintering temperature to control microstructure (surface area, porosity, particle connectivity).

Main Results:

  • The optimized GBSCF-YSZ cathode achieved an area-specific resistance of 0.006 Ω·cm² at 700°C.
  • A single cell with a Ce-Pd anode and thin electrolyte demonstrated a maximum power density of ~0.6 W·cm⁻² at 700°C.
  • The GBSCF material exhibited excellent electrochemical performance and structural stability.

Conclusions:

  • The optimized GBSCF-YSZ composite cathode effectively reduces polarization resistance in IT-SOFCs.
  • Microstructure engineering is crucial for enhancing the electrochemical activity and performance of SOFC cathodes.
  • The developed cathode material shows promise for efficient intermediate temperature solid oxide fuel cell applications.