US 6,632,554 B2 · High performance cathodes for solid oxide fuel cells

Abstract

The present invention relates to a multi-layered and multifunctional cathode in solid oxide fuel cells having high conductivity, high catalytic activity, minimized coefficient of thermal expansion (CTE) mismatch, excellent compatibility to other portions of the fuel cell, and reduced temperature operation. The cathode comprises a conductive layer, a catalyst layer and a graded composition layer. The conductive layer has a first density, the catalyst layer has a second density that is less than the first density, and the graded composition layer is characterized by a graded electronic conductivity and a graded ionic conductivity.

Claims30

Dependent claims

A solid oxide fuel cell, comprising:

an anode;
an electrolyte adjacent said anode;
and
a cathode adjacent said electrolyte, said cathode comprising a conductive layer adjacent said electrolyte;
a catalyst layer adjacent said conductive layer;
and
a graded composition layer adjacent said catalyst layer.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

09/832,625Filed 10 Apr 2001

Published

US 2002/0177031 A128 Nov 2002

Granted

14 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H01M 4/9066
Specially used in fuel cell operating at high temperature, e.g. SOFC: of metal-ceramic composites or mixtures, e.g. cermets
H01M 4/8605
Inert electrodes with catalytic activity, e.g. for fuel cells: porous electrodes
H01M 4/9016
Selection of catalytic material: oxides, hydroxides or oxygenated metallic salts
H01M 4/9033
Oxides specially used in fuel cell operating at high temperature, e.g. SOFC: complex oxides, optionally doped, of the type M1MeO3, M1 being an…

High performance cathodes for solid oxide fuel cells

Life of this patent

High performance cathodes for solid oxide fuel cells

Life of this patent

Abstract

Claims30