Improved Sr0.6La0.4Co0.8Fe0.2O3¡d/Ce0.8Y0.2O2¡d interface for IT-SOFC applications

BAQUÉ, LAURA; PADMASREE, K.; CENICEROS REYES, M.; TROIANI, HORACIO; SERQUIS, ADRIANA C.; SOLDATI, ANALIA L.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 41 p. 1958 - 1965

0360-3199

One of the remaining challenges for the solid oxide fuel cell (SOFC) technology isdecreasing its operation temperature to the 500e800 C range in a cost-effective waywithout diminishing the cell performance. In this work, we studied a symmetrical cellcomposed of Sr0.6La0.4Co0.8Fe0.2O3d (LSCFO) cathodes deposited on a Ce0.8Y0.2O2d (CYO) substrate by the simple, cost-effective and scalable spin coating technique. The nanostructured cathode is composed of agglomerated ~100e200 nm particles with ~50 nmcrystallite size. Electrochemical impedance spectroscopy (EIS) analysis indicates thatelectrolyte grain boundary conductivity strongly depends on the cathode nature. Thedetailed high resolution transmission electron microscopy (HR-TEM) characterization ofthe LSCFO/CYO interface reveals that the LSCFO cathode is well adhered to the CYOelectrolyte. The improved nano/microstructure of the cathodes and the cathode/electrolyteinterface yields to cathode area specific resistance (ASR) values as low as 0.4 Ucm2 at550 C, being these values even lower than those previously reported in literature forcathodes in optimized LSCFO/CYO/YSZ/CYO/LSCFO cells.