Journal
ELECTROCHIMICA ACTA
Volume 89, Issue -, Pages 372-376Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.11.002
Keywords
Cathode; Coulometric titration; Electrical conductivity; Oxygen non-stoichiometiy; Solid oxide fuel cells
Categories
Funding
- Basic Science Research Program [2012-R1A1A1013380, 2010-0021214]
- National Research Foundation of Korea [R31-2009-000-20012-0]
- Ministry of Education, Science and Technology
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20113020030060]
- Korea government Ministry of Knowledge Economy
- National Research Foundation of Korea [2010-0021214] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2012 Elsevier Ltd. All rights reserved.
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