Lanthanum manganite-based air electrode for solid oxide fuel cells

Patent · Tue Jun 29 00:00:00 EDT 1999

OSTI ID:6209459

Ruka, R J; Kuo, L; Li, B

An air electrode material for a solid oxide fuel cell is disclosed. The electrode material is based on lanthanum manganite having a perovskite-like crystal structure ABO[sub 3]. The A-site of the air electrode material preferably comprises La, Ca, Ce and at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd. The B-site of the electrode material comprises Mn with substantially no dopants. The ratio of A:B is preferably slightly above 1. A preferred air electrode composition is of the formula La[sub w]Ca[sub x]Ln[sub y]Ce[sub z]MnO[sub 3], wherein Ln comprises at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd, w is from about 0.55 to about 0.56, x is from about 0.255 to about 0.265, y is from about 0.175 to about 0.185, and z is from about 0.005 to about 0.02. The air electrode material possesses advantageous chemical and electrical properties as well as favorable thermal expansion and thermal cycle shrinkage characteristics. 10 figs.

• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC21-91MC28055
• Assignee: Siemens Westinghouse Power Corp., Orlando, FL (United States)
• Patent Number(s): US 5916700; A
• Application Number: PPN: US 9-012778
• OSTI ID: 6209459
• Resource Relation: Patent File Date: 23 Jan 1998
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
ELECTRODES
MANGANESE OXIDES
RARE EARTH COMPOUNDS
SOLID ELECTROLYTE FUEL CELLS
THERMODYNAMIC PROPERTIES
CHALCOGENIDES
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
FUEL CELLS
MANGANESE COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
300503* - Fuel Cells- Materials
Components
& Auxiliaries
360200 - Ceramics
Cermets
& Refractories