Mechanical Engineering Commons^™

Oxygen Permeation Through Cobalt-Containing Perovskites: Surface Oxygen Exchange Vs. Lattice Oxygen Diffusion, Kevin Huang, John B. Goodenough

Faculty Publications

The oxygen permeation fluxes from p′_O2 to pⁿ_O2 (p′_O2>pⁿ_O2) across cobalt-containing perovskite ceramic membranes La_1−xSr_xCoO_3−δ and SrCo_0.8Fe_0.2O_3−δ were measured by gas chromatography as functions of oxygen chemical potential gradient, temperature, thickness, and catalytic activity on the surface. Power indexes 0.5>n>0 for uncatalyzed La_1−xSr_xCoO_3−δ and 1>n>0.5 for SrCo_0.8Fe_0.2O_3−δ were obtained when J_O2 vs. p′ⁿ_O2−p'′ⁿ_{O2 …}