Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 37, Issue 10, Pages 8613-8620Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.02.139
Keywords
SOFC; LSCF cathode; LCC catalyst coating; Surface enhancement; Stability
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Funding
- Department of Energy, National Energy Technology Laboratory [DE-NT0006557]
- Heterogeneous Functional Materials (HeteroFoaM) Center, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001061]
- WCU at UNIST, South Korea
- National Research Foundation of Korea [R31-2012-000-20012-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mixed ionic-electronic conductors in the family of LaxSr1-xCoyFe1-yO3-delta (LSCF) have been widely studied as cathode materials for solid oxide fuel cells (SOFCs). However, the long-term stability and the limited surface catalytic activity are still a concern. Here we report a new catalyst La0.4875Ca0.0125Ce0.5O2-delta (LCC), which can significantly enhance the performance and stability of LSCF cathodes when applied as a thin-film coating on LSCF surface. For example, with 5 mu L 0.25 mol L-1 LCC solution infiltrated into LSCF cathode, the cathodic polarization resistance was reduced by similar to 60% (to similar to 0.076 Omega cm(2)) at 750 degrees C, leading to a peak power density of similar to 1.25 W/cm(2), which is similar to 18% higher than that for the unmodified LSCF cathode in an anode-supported cell. In addition, stable power output was observed for over 500 h operation at 750 degrees C under a constant voltage of 0.7 V. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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