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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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Thermodynamic and electrical properties of Ba0.5Sr0.5Co0.8Fe0.2O3-delta and La0.6Sr0.4Co0.2Fe0.8O3-delta for intermediate-temperature solid oxide fuel cells

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Title
Thermodynamic and electrical properties of Ba0.5Sr0.5Co0.8Fe0.2O3-delta and La0.6Sr0.4Co0.2Fe0.8O3-delta for intermediate-temperature solid oxide fuel cells
Author
Jun, AreumYoo, SeonyoungGwon, Oh-hunShin, JeeyoungKim, Guntae
Keywords
Alkaline earth; Cath-ode materials; Coulometric titration; Electrical conductivity; Electronic and ionic conductivity; Electronic conductivity; Intermediate temperature solid oxide fuel cell; IT-SOFCs; Low oxygen partial pressure; Oxygen non-stoichiometry; Oxygen partial pressure; Perovskite type oxides; Redox behavior; Redox stability
Issue Date
201302
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.89, no., pp.372 - 376
Abstract
Perovskite type oxides based on alkaline-earth and/or rare-earth containing cobaltites with high electronic and ionic conductivities are suitable for cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Much of the prior work, in particular, has been focused on Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) and La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) because of their high catalytic activity and a sufficiently high electronic conductivity. This study focuses on the redox behavior and stability of BSCF and LSCF at low oxygen partial pressures. The variation of oxygen non-stoichiometry (delta) and its effect on the electrical conductivity of the BSCF and LSCF are investigated using coulometric titration in a wide range of oxygen partial pressure. Thermodynamic properties including oxidation enthalpies and entropies are determined from the oxidation isotherms. The BSCF and LSCF are considered to be a suitable cathode material of IT-SOFC in terms of electrical conductivity and redox stability.
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DOI
http://dx.doi.org/10.1016/j.electacta.2012.11.002
ISSN
0013-4686
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