A manometric method for the determination of chemical diffusion in perovskite-type cathode materials of the solid oxide fuel cell

This paper describes a manometric method for the determination of chemical diffusion coefficients from gas/solid equilibration kinetics for electrode materials of the type (La,Sr)(Mn,Fe,Co)O-3. The equilibration kinetics was monitored by measurements of the p(O-2) changes during a reaction between o xygen and the electrode material involving both oxidation and reduction exp eriments in the temperature range 773-1123 K. Activation energy of the chem ical diffusion measurements at different temperatures was determined during both oxidation and reduction experiments. The chemical diffusion coefficie nts measured by the present manometric method on La0.8Sr0.2 MnO3-delta have been compared with those reported in the literature. (C) 2001 Elsevier Sci ence Ltd and Techna S.r.l. All rights reserved.