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Method of making a layered composite electrode/electrolyte

United States Patent

January 25, 2005
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
Surface Additives for Enhanced Electrode Performance
An electrode/electrolyte structure is prepared by a plurality of methods. An unsintered (possibly bisque fired) moderately catalytic electronically-conductive or homogeneous mixed ionic electronic conductive electrode material is deposited on a layer composed of a sintered or unsintered ionically-conductive electrolyte material prior to being sintered. A layer of particulate electrode material is deposited on an unsintered ("green") layer of electrolyte material and the electrode and electrolyte layers are sintered simultaneously, sometimes referred to as "co-firing," under conditions suitable to fully densify the electrolyte while the electrode retains porosity. Or, the layer of particulate electrode material is deposited on a previously sintered layer of electrolyte, and then sintered. Subsequently, a catalytic material is added to the electrode structure by infiltration of an electrolcatalyst precursor (e.g., a metal salt such as a transition metal nitrate). This may be followed by low temperature firing to convert the precursor to catalyst. The invention allows for an electrode with high electronic conductivity and sufficient catalytic activity to achieve high power density in an ionic (electrochemical) device such as fuel cells and electrolytic gas separation systems.
Visco; Steven J. (Berkeley, CA), Jacobson; Craig P. (El Cerrito, CA), DeJonghe; Lutgard C. (Lafayette, CA)
The Regents of the University of California (Berkeley, CA)
10/ 724,558
November 26, 2003
This invention was made with government support in the course of or under prime contract No. DE-ACO3-76SF00098 between the U.S. Department of Energy and the University of California. The government has certain rights in this invention.