Method of making sulfur tolerant composite cermet electrodes for solid oxide electrochemical cells
A method is described for bonding a separate, porous, active layer on an electronically conductive fuel cell electrode attached to a solid electrolyte, oxygen ion transporting oxide layer comprising: forming a coating of particles of an electronic conductor selected from the group consisting of nickel, cobalt, and mixtures thereof on a first surface of an oxygen ion transporting, solid oxide electrolyte layer comprising zirconia; applying a source of oxygen to a second surface of the solid oxide electrolyte layer; applying a metal halide vapor to the first surface of the solid oxide electrolyte layer; heating the oxygen transporting, solid oxide electrolyte layer to a temperature sufficient to induce oxygen to diffuse through the oxide layer and react with the metal halide vapor; coating both the particles and the ion conducting metal oxide skeletal structure with a separate, salt coating which upon heating will form an oxide selected from the group consisting of ceria, doped ceria, uranium oxide, doped uranium oxide, and mixtures thereof; and then heating the salt coated structure at a temperature of from about 500/sup 0/C to about 1400/sup 0/C, to form a separate, porous, ionic-electronic conductive, active coating comprising an oxide selected from the group consisting of ceria, doped ceria, uranium oxide, doped uranium oxide, and mixtures thereof.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4812329
- OSTI ID:
- 6099953
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300501* -- Fuel Cells-- Design & Development
CERMETS
CHALCOGENIDES
COBALT
COMPOSITE MATERIALS
CORROSION PROTECTION
CORROSION RESISTANCE
DESIGN
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTORS
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
ELEMENTS
FABRICATION
FUEL CELLS
HALIDES
HALOGEN COMPOUNDS
MATERIALS
METALS
NICKEL
OXIDES
OXYGEN COMPOUNDS
SOLID ELECTROLYTES
TRANSITION ELEMENTS