MATERIAL SCIENCE ASPECTS OF SOFC TECHNOLOGY WITH SPECIAL REFERENCE TO ANODE DEVELOPMENT

A model is presented for the development of alternative oxide anodes that can be optimised either for the complete or partial oxidation of methane. The model requires information about the kinetics of oxygen surface exchange and diffusion, and relevant data using 18O/16O isotopic exchange and SIMS measurements are summarised. Materials selection requires further information about the relevant defect chemistry and electronic conductivity and La0.8Sr0.2FeO3-σ and CeO2-x are used as examples of anode materials that can be used to electrochemically oxidise CH4 to CO2 and H2O. The performance of these materials in solid oxide electrolyte fuel cells is analysed in terms of the parameters mentioned earlier, and a strategy is suggested for the development of alternative oxide anodes for both the complete and partial oxidation of CH4. © 1990.