Preparation and Characterization of (La _0.8 Sr _0.2 ) _0.95 MnO _3-δ (LSM) Thin Films and LSM/LSCF Interface for Solid Oxide Fuel Cells

Journal Article · Wed May 25 00:00:00 EDT 2011 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1551-2916.2011.04614.x· OSTI ID:1383157

Choi, Jong-Jin; Qin, Wantao ^[1]; Liu, Mingfei ^[1]; Liu, Meilin ^[1]

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1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA

Uniform, dense, and conformal coatings of (La,Sr)MnO_3-δ (LSM) have been successfully deposited on a silicon wafer and a dense (La,Sr)(Co,Fe)O_3-δ (LSCF) substrate using a stable LSM sol consisting of metal acetate and nitrate precursors dissolved in a mixed organic solvent of 2-methoxyethanol and acetic acid with enhanced wettability. The processing conditions are optimized for precise control of composition, morphology, microstructure, and thickness of the LSM films to examine the microstructure and chemical stability of an LSM film as a catalytic coating for an LSCF cathode. The thicknesses of the LSM films are controlled within the range of 5–60 nm by spin-coating of LSM sol with different concentrations. The LSM films grow epitaxially on the LSCF substrate grains after annealing at 800°C for 1 h due to their structural similarity. The LSM coatings show good stability on LSCF substrates and may suppress strontium oxide segregation on LSCF surface during annealing at 850°C for 900 h, implying that LSM-coated LSCF surfaces have better structural and chemical stability under typical fuel cell operating conditions.

• 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: 1383157
• Journal Information: Journal of the American Ceramic Society, Vol. 94, Issue 10; 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 0002-7820
• Publisher: American Ceramic Society
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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)