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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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Effect of Fe Doping on Layered GdBa0.5Sr0.5Co2O5+delta Perovskite Cathodes for Intermediate Temperature Solid Oxide Fuel Cells

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Title
Effect of Fe Doping on Layered GdBa0.5Sr0.5Co2O5+delta Perovskite Cathodes for Intermediate Temperature Solid Oxide Fuel Cells
Author
Kim, JunyoungJun, AreumShin, JeeyoungKim, Guntae
Keywords
COMPOSITE CATHODES; OXYGEN DIFFUSION; SOFC; ELECTRODE; KINETICS; X=0; GD; SM; DY
Issue Date
201402
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.97, no.2, pp.651 - 656
Abstract
Layered perovskite cathode materials have received considerable attention for intermediate temperature solid oxide fuel cells (IT-SOFCs) because of their fast oxygen ion diffusion through pore channels and high catalytic activity toward the oxygen reduction reaction (ORR) at low temperatures. In this study, we have investigated the effects of Fe substitution for the Co site on electrical and electrochemical properties of a layered perovskite, GdBa0.5Sr0.5Co2-xFexO5+delta (x=0, 0.5, and 1.0), as a cathode material for IT-SOFCs. Furthermore, electrochemical properties of GdBa0.5Sr0.5CoFeO5+delta-yGDC (y=0, 20, 40, and 50 wt%) cathodes were evaluated to determine the optimized cell performance. At a given temperature, the electrical conductivity and the area-specific resistances (ASRs) of GdBa0.5Sr0.5Co2-x FexO5+delta decrease with Fe content. The lowest ASR of 0.067 Omega center dot cm(2) was obtained at 873K for the GdBa0.5Sr0.5CoFeO5+delta. The GdBa0.5Sr0.5CoFeO5+delta composite with 40 wt% GDC was identified as an optimum cathode material, showing the highest maximum power density (1.31 W/cm(2)) at 873 K, and other samples also showed high power density over 1.00 W/cm(2).
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DOI
http://dx.doi.org/10.1111/jace.12692
ISSN
0002-7820
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