Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 9, Pages 2628-2632Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.11.067
Keywords
Solid oxide fuel cell composite cathode; Functionally-graded layer; Durability
Funding
- Ministry of Commerce
- Ministry of Knowledge Economy (MKE)
- Industry and Energy (MOCIE)
- Seoul RBD Program [CS070157]
- Ministry of Education, Science, and Technology [ROA-2005-000-10011-0]
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A double-layer dual-composite cathode is fabricated and has an ideal cathode microstructure with large electrochemical active sites and enhanced the durability in solid oxide fuel cells (SOFCs). The insertion of a yttria-stabilized zirconia (YSZ)-rich functional layer between the electrolyte and the electrode allows for a graded transition of the YSZ phase, which enhances ionic percolation and minimizes the thermal expansion coefficient mismatch. Electrochemical measurements reveal that the double-layer composite cathode exhibits improved cathodic performance and long-term stability compared with a single-layer composite cathode. A cell with a well-controlled cathode maintains nearly constant interfacial polarization resistance during an 80h accelerated lifetime test. (C) 2009 Elsevier B.V. All rights reserved.
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