  We evaluated for the first time the use of nanostructured layered perovskites
of formulae LnBaCo2O6-d with Ln = Sm and Gd (SBCO and GBCO, respetively) as
SOFC cathodes, finding promising electrochemical properties in the intermediate
temperature range (~700{\deg}C). The synthesis of these nanomaterials, not
reported before, was achieved by using porous templates to confine the chemical
reagents in regions of about 200 nm and 800 nm. The performance of
nanostructured SBCO and GBCO cathodes for the oxygen reduction reaction was
analyzed in symmetrical cells using Gd2O3-doped CeO2 (GDC) as electrolyte. For
this purpose, nanostructured SBCO and GBCO cathodes were deposited on both
sides of the electrolyte by a simple thick-film procedure and evaluated by
Electrochemical Impedance Spectroscopy technique under different operating
conditions. We found that cathodes synthesized using smaller template pores
exhibited better performance. Besides, SBCO cathodes displayed lower
area-specific resistance than GBCO ones.
