Lanthanum manganite-based air electrode for solid oxide fuel cells
Abstract
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.
- Inventors:
- Issue Date:
- Sponsoring Org.:
- USDOE; USDOE, Washington, DC (United States)
- OSTI Identifier:
- 6209459
- Patent Number(s):
- 5916700
- Application Number:
- PPN: US 9-012778
- Assignee:
- Siemens Westinghouse Power Corp., Orlando, FL (United States)
- DOE Contract Number:
- FC21-91MC28055
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 23 Jan 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 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
Citation Formats
Ruka, R J, Kuo, L, and Li, B. Lanthanum manganite-based air electrode for solid oxide fuel cells. United States: N. p., 1999.
Web.
Ruka, R J, Kuo, L, & Li, B. Lanthanum manganite-based air electrode for solid oxide fuel cells. United States.
Ruka, R J, Kuo, L, and Li, B. Tue .
"Lanthanum manganite-based air electrode for solid oxide fuel cells". United States.
@article{osti_6209459,
title = {Lanthanum manganite-based air electrode for solid oxide fuel cells},
author = {Ruka, R J and Kuo, L and Li, B},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 29 00:00:00 EDT 1999},
month = {Tue Jun 29 00:00:00 EDT 1999}
}