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Title: 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 A
Application Number:
PPN: US 9-012778
Assignee:
Siemens Westinghouse Power Corp., Orlando, FL (United States) PTO; EDB-99-078959
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 = {1999},
month = {6}
}