La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathodes infiltrated with samarium-doped cerium oxide for solid oxide fuel cells

Journal Article · Sun Aug 01 00:00:00 EDT 2010 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2010.02.049· OSTI ID:1381287

Nie, Lifang; Liu, Mingfei; Zhang, Yujun; Liu, Meilin

Porous La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) cathodes are coated with a thin film of Sm_0.2Ce_0.8O_1.95-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 Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: SC0001061
• OSTI ID: 1381287
• Journal Information: Journal of Power Sources, Vol. 195, Issue 15; Related Information: HeteroFoaM partners with University of South Carolina (lead); University of California, Santa Barbara; University of Connecticut; Georgia Institute of Technology; Princeton University; Rochester Institute of Technology; Savannah River National Laboratory; University of South Carolina; University of Utah; ISSN 0378-7753
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

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