Lanthanum manganite-based air electrode for solid oxide fuel cells
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:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-91MC28055
- Assignee:
- Siemens Westinghouse Power Corp., Orlando, FL (United States)
- Patent Number(s):
- A; US 5916700
- Application Number:
- PPN: US 9-012778
- OSTI ID:
- 6209459
- Country of Publication:
- United States
- Language:
- English
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Air electrode composition for solid oxide fuel cell
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Related Subjects
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360200 -- Ceramics
Cermets
& Refractories
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODES
FUEL CELLS
MANGANESE COMPOUNDS
MANGANESE OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SOLID ELECTROLYTE FUEL CELLS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS