A mixed ionic and electronic conducting membrane includes a two-phase solid state ceramic composite, wherein the first phase comprises an oxygen ion conductor and the second phase comprises an n-type electronically conductive oxide, wherein the electronically conductive oxide is stable at an oxygen partial pressure as low as 10.sup.-20 atm and has an electronic conductivity of at least 1 S/cm. A hydrogen separation system and related methods using the mixed ionic and electronic conducting membrane are described.
STATEMENT OF GOVERNMENT SUPPORT
This invention was made with United States Government Support under Contract Number DE-FC26-03NT41958 awarded by the Department of Energy. The Government has certain rights to this invention.