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Oxygen ion conducting materials

United States Patent

July 12, 2005
View the Complete Patent at the US Patent & Trademark Office
Argonne National Laboratory - Visit the Technology Development and Commercialization Website
An oxygen ion conducting ceramic oxide that has applications in industry including fuel cells, oxygen pumps, oxygen sensors, and separation membranes. The material is based on the idea that substituting a dopant into the host perovskite lattice of (La,Sr)MnO.sub.3 that prefers a coordination number lower than 6 will induce oxygen ion vacancies to form in the lattice. Because the oxygen ion conductivity of (La,Sr)MnO.sub.3 is low over a very large temperature range, the material exhibits a high overpotential when used. The inclusion of oxygen vacancies into the lattice by doping the material has been found to maintain the desirable properties of (La,Sr)MnO.sub.3, while significantly decreasing the experimentally observed overpotential.
Vaughey; John (Elmhurst, IL), Krumpelt; Michael (Naperville, IL), Wang; Xiaoping (Downers Grove, IL), Carter; J. David (Bolingbrook, IL)
The University of Chicago (Chicago, IL)
10/ 900,054
July 27, 2004
STATEMENT OF GOVERNMENT RIGHTS This invention was made with Government support under Contract No. W-31-109-ENG-38 awarded by the U.S. Department of Energy. The Government has certain rights in this invention.