The H permeability of SrCe0.95Eu0.05O3-δ and SrCe0.95Sm0.05O3-δ was studied as a function of temperature, H partial pressure (PH2) gradient, and water vapor partial pressure (PH2O) gradient. Under 100% dry H conditions at 1123K, the H permeation rates of dense membranes (1.72mm thick) were about 3.19 x 10-9mol/cm2s for SrCe0.95Eu0.05O3-δ and 2.33 x 10-9mol/cm2s for SrCe0.95Sm0.05O3-δ. Under wet H conditions at 1123K, the H permeation rates were about 2.89 x 10-9 and 1.21 x 10-9mol/cm2s, respectively, for the same materials. The dopant dependence of H permeability was explained in terms of the ionization potential of the dopant. Electronic conductivity was calculated from H permeation fluxes; activation energies for electron conduction under both dry and wet conditions were also calculated.

Hydrogen Permeability of SrCe1-xMxO3-δ (x = 0.05, M = Eu, Sm). S.J.Song, E.D.Wachsman, J.Rhodes, S.E.Dorris, U.Balachandran: Solid State Ionics, 2004, 167[1-2], 99-105