Isotopic tracer diffusion studies were performed on the perovskite composition La0.2175Pr0.2175Ba0.145Sr0.4Fe0.8Co0.2O3−δ to obtain the diffusion and surface exchange coefficients for oxygen. This material was identified as a highly active electrocatalytic cathode for intermediate temperature solid oxide fuel cells. The oxygen diffusion coefficients obtained in the 450-650C temperature range were higher than the ones measured for most of the cathode materials reported in the literature and they agree with those calculated from electrochemical impedance spectroscopy measurements performed on symmetrical cells.

Enhanced Oxygen Diffusion in Low Barium-Containing La0.2175Pr0.2175Ba0.145Sr0.4Fe0.8Co0.2O3-δ Intermediate Temperature Solid Oxide Fuel Cell Cathodes. V.B.Vert, J.M.Serra, J.A.Kilner, M.Burriel: Journal of Power Sources, 2012, 213, 270-4