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La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes infiltrated with samarium-doped cerium oxide for solid oxide fuel cells

Journal Article · · Journal of Power Sources
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Porous La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathodes are coated with a thin film of Sm0.2Ce0.8O1.95-δ (SDC) using a one-step infiltration process. Examination of the microstructures reveals that small SDC particles are formed on the surface of LSCF grains with a relatively narrow size distribution. Impedance analysis indicates that the SDC infiltration has dramatically reduced the polarization of LSCF cathode, reaching interfacial resistances of 0.074 and 0.44 Ω cm2 at 750 °C and 650 °C, respectively, which are about half of those for LSCF cathode without infiltration of SDC. The activation energies of the SDC infiltrated LSCF cathodes are in the range of 1.42–1.55 eV, slightly lower than those for a blank LSCF cathode. The SDC infiltrated LSCF cathodes have also shown improved stability under typical SOFC operating conditions, suggesting that SDC infiltration improves not only power output but also performance stability and operational life.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
SC0001061
OSTI ID:
1381287
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: 15 Vol. 195; ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Related Subjects

30 DIRECT ENERGY CONVERSION
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
carbon sequestration
catalysis (heterogeneous)
charge transport
energy storage (including batteries and capacitors)
hydrogen and fuel cells
materials and chemistry by design
mechanical behavior
membrane
synthesis (novel materials)
synthesis (scalable processing)
synthesis (self-assembly)