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

The chemical reactivity of La2NiO4+δ and nickel metal or nickel oxide with fast oxide-ion conductor La2Mo2O9 is investigated in the annealing temperature range between 600 and 1000 °C, using room temperature X-ray powder diffraction. Within the La2NiO4+δ/La2Mo2O9 system, subsequent reaction is evidenced at relatively low annealing temperature (600 °C), with formation of La2MoO6 and NiO. The reaction is complete at 1000 °C. At reverse, no reaction occurs between Ni or NiO and La2Mo2O9 up to 1000 °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.

The absence of chemical reaction between Ni or NiO and La2Mo2O9 up to 1000 °C, evidenced by room temperature X-ray powder diffraction, makes Ni-based cermet potential anode materials for LAMOX electrolyte.Figure optionsDownload as PowerPoint slide