Flowerlike CeO 2 microspheres coated with Sr 2 Fe 1.5 Mo 0.5 O x nanoparticles for an advanced fuel cell

Abstract

Flowerlike CeO 2 coated with Sr 2 Fe 1.5 Mo 0.5 O x (Sr-Fe-Mo-oxide) nanoparticles exhibits enhanced conductivity at low temperatures (300-600a €‰ o C), e.g. 0.12a €‰S cm a '1 at 600a €‰ o C, this is comparable to pure ceria (0.1a €‰S cm a '1 at 800a €‰ o C). Advanced single layer fuel cell was constructed using the flowerlike CeO 2 /Sr-Fe-Mo-oxide layer attached to a Ni-foam layer coated with the conducting transition metal oxide. Such fuel cell has yielded a peak power density of 802a €‰mWcm a '2 at 550a €‰ o C. The mechanism of enhanced conductivity and cell performance were analyzed. These results provide a promising strategy for developing advanced low-temperature SOFCs.