Fabrication of aligned porous LaNi0.6Fe0.4O3 perovskite by water based freeze casting

Abstract A novel porous cathode of LaNi 0.6 Fe 0.4 O 3 perovskite with aligned porosities was engineered for solid oxide fuel cells. LaNi 0.6 Fe 0.4 O 3 was produced through metal nitrate and acid citric combustion method and calcined at different temperatures. The synthesized LNF at 600 °C shows specific surface area (S BET ) of 24.4 m 2  g −1 and an average pore size of 12.2 nm. The chemical composition and structure of LaNi 0.6 Fe 0.4 O 3 synthesized at temperature 600–1400 °C, were analyzed by XRD, XPS and HRTEM. SEM observations of freeze cast nano-sized LNF showed the vertically aligned hexagonal walls. These walls contain a great value of fine pores which accelerate the gas transportation.