Steady-state O permeation through polycrystalline La2NiO4+δ, synthesized by using a citric acid-based technique and sintered at 1350C, was measured as a function of O gradient, temperature (850 to 1000C), and membrane thickness (0.3 to 2.5mm). In agreement with previous reports, the La2NiO4+δ membranes exhibited high permeation rates, comparable to those found for perovskite-related La1–xSrxCo1–yFeyO3–δ materials. The self-diffusion coefficient and the surface exchange coefficient of O were extracted from the data through transport modeling using averaged bulk transport parameters and through numerical analysis based upon a 1-dimensional finite-element method. The self-diffusion coefficient and surface exchange coefficients exhibited Arrhenius-type behavior with activation energies of 40 and 110kJ/mol, respectively, and agreed qualitatively with literature data obtained by 16O2/18O2 exchange/secondary ion mass spectroscopy analysis at lower temperatures.

On the Steady-State Oxygen Permeation through La2NiO4+δ Membranes. J.B.Smith, T.Norby: Journal of the Electrochemical Society, 2006, 153[2], A233-8