The thermodynamic equilibrium constants and charge-carrier mobilities for SrCe0.95Yb0.05O3-α and SrCe0.95Tm0.05O3-α were estimated by fitting the H permeation flux model to the experimental data on SrCe0.95Yb0.05O3-α and SrCe0.95Tm0.05O3-α. The results indicated that the thermodynamic equilibrium constants, and the mobility of protons and electrons, in SrCe0.95Tm0.05O3-α could be higher than for SrCe0.95Yb0.05O3-α; leading to a higher H permeation flux in SrCe0.95Tm0.05O3-α. A parametric sensitivity analysis was performed by using the new Morris method to investigate the influence of thermodynamic equilibrium constants, and the charge carrier mobilities, upon the H permeation flux model. The results indicated that the H permeation flux model used here was most sensitive to the internal electronic equilibrium constant value and least sensitive to the hole mobility.

Numerical Study of Hydrogen Permeation Flux in SrCe0.95Yb0.05O3-α and SrCe0.95Tm0.05O3-α. M.Matsuka, R.Braddock, I.Agranovski: Solid State Ionics, 2007, 178[13-14], 1011-9