Physicochemical compatibility of SrCeO3 with potential SOFC cathodes
作者： J. Tolchard , T. Grande
DOI: 10.1016/J.JSSC.2007.08.004
关键词:
摘要: The chemical and physical compatibility of SrCeO3 is investigated with respect to LaMO3 (M=Mn, Fe, Co) La2−xSrxNiO4 (x=0, 0.8), via the reaction fine-grained powder compacts solid-state diffusion couples. Compositions were chosen so as give predictive insight into possible candidate materials for all-oxide electrochemical devices. Results show primary in these systems be dissolution SrO from LaMO3/La2−xSrxNiO4, corresponding formation La-doped CeO2. Reaction kinetics are observed relatively fast, element profiles suggesting Sr2+ ceria surprisingly rapid. It demonstrated that perovskite starting represent poor candidates use SrCeO3, reacting completely form Ruddlesden-Popper/K2NiF4 type oxides. La2NiO4 less pronounced, secondary phases suppressed composition La1.2Sr0.8NiO4. thus concluded Ruddlesden-Popper oxides good a SrCeO3-based electrolytes when doped appropriate levels Sr.
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