Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 4, Issue 6, Pages 2249-2258Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee01188j
Keywords
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Funding
- U.S. Department of Energy (DOE) [DE-NT-0006557]
- U.S. DOE, Office of Science, Office of Basic Energy Sciences (BES) [DE-SC0001061]
- Division of Scientific User Facilities, BES, U.S. DOE
- National Research Council of Science & Technology (NST), Republic of Korea [PNK2530] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A carefully designed test cell platform with a new electrode structure is utilized to determine the intrinsic surface catalytic properties of an electrode. With this design, the electrocatalytic activity and stability of an La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode is enhanced by a dense thin La0.85Sr0.15MnO3 +/-delta (LSM) coating, suggesting that an efficient electrode architecture has been demonstrated that can make effective use of desirable properties of two different materials: fast ionic and electronic transport in the backbone (LSCF) and facile surface kinetics on the thin-film coating (LSM). Theoretical analyses suggest that the enhanced electrocatalytic activity of LSM-coated LSCF is attributed possibly to surface activation under cathodic polarization due to the promotion of oxygen adsorption and/or dissociation by the surface layer and the dramatically increased oxygen vacancy population in the surface film. Further, the observed time-dependent activation over a few hundreds of hours and durability are likely associated with the formation of a favorable hybrid surface phase intermediate between LSM and LSCF. This efficient electrode architecture was successfully applied to the state-of-the-art LSCF-based cathodes by a simple solution infiltration process, achieving reduced interfacial resistance and improved stability under fuel cell operating conditions.
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