Compatibility evaluation between La2Mo2O9 fast oxide-ion conductor and Ni-based materials

摘要

The chemical reactivity of La2NiO4+delta and nickel metal or nickel oxide with fast oxide-ion conductor La2Mo2O9 is investigated in the annealing temperature range between 600 and 1000 degrees C using room temperature X-ray powder diffraction. Within the La2NiO4 1 delta/ La2Mo2O9 system. subsequent reaction is evidenced at relatively low annealing temperature (600 degrees C). with formation of La2MoO6 and NiO. The reaction is complete at 1000 degrees C. At reverse. no reaction occurs between Ni or NiO and La2Mo2O9 up to 1000 degrees C. Together with a previous work [G. Corbel. S. Mestiri. P. Lacorre, Solid State Sci. 7 (2005) 1216], the current study shows that Ni-CGO cermets might be chemically and mechanically compatible anode materials to work with LAMOX electrolytes in solid oxide fuel cells. (C) 2006 Elsevier Inc. All rights reserved.