Novel La2NiO4+δ and La4Ni3O10-δ composites for solid oxide fuel cell cathodes

Ruddlesden-Popper phases of the formula (LaNiO3)(n)LaO are potential materials for intermediatetemperature solid oxide fuel cell cathodes. The n = 1 phase La2NiO4+delta is known to have good ionic conductivity but its performance as a single-phase cathode is limited by its electronic conductivity. The n = 3 phase La4Ni3O10-delta is known to have good total conductivity but has been little-explored as a cathode. In this study we explore composite electrodes of these two materials with a view to taking advantage of their complimentary properties. The performance of these electrodes is compared to that of the single-phase end-members and is found to be improved above 600 degrees C. A 50:50 wt.% La2NiO4+delta:La4Ni3O10-delta mix gave the best performance and represents best-in-class for these materials. (C) 2013 Elsevier B.V. All rights reserved.