Journal
ELECTROCHIMICA ACTA
Volume 125, Issue -, Pages 683-690Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.01.112
Keywords
Solid oxide fuel cell; Cathode; Layered perovskite; Thermal expansion coefficient; Electrochemical performance
Categories
Funding
- Basic Science Research Program [2012-R1A1A1013380]
- Mid-carrer Researcher through the National Research Foundation of Korea - Ministry of Education, Science and Technology [2013R1A2A2A04015706, 2011-0010773]
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Knowledge Economy
- BK21 plus - Korea Government Ministry of Education [10Z2013001105]
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Solid oxide fuel cell (SOFC) is a new electric power generation system with the advantages of high efficiency, no emissions of pollutant, and a wide range of fuels. Layered perovskite oxides have received extensive attention as promising cathode materials for SOFCs because of their faster diffusion coefficient and transport kinetics of oxygen compared to those of ABO(3)-type perovskite oxides. With the goals of lowering the thermal expansion coefficient (TEC) and maximizing electrochemical properties, this study focuses on the copper (Cu) effect in PrBa0.5Sr0.5Co2-xCuxO5+delta (x = 0, 0.5, and 1.0) layered perovskite oxides by investigating their structural characteristics, electrical properties, and electrochemical performance. The electrical conductivity decreases with increasing Cu content, mainly due to the decreasing amount of Co3+/4+. The average TEC values are also identified and the substitution of Cu for Co is beneficial to lower the TEC by suppression of the spin state transitions of Co3+ and reduction of Co4+. To better understand the thermodynamic behavior of the materials while checking redox stability, coulometric titration experiment is performed. We also investigate the electrochemical performance of PrBa0.5Sr0.5Co2-xCuO5+delta cathode materials using a Ni-GDC anode-supported cell. All samples show sufficiently high power density around over 1.0W cm(-2) at 600 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
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