Infiltrated Sr2Fe1.5Mo0.5O6/La0.9Sr0.1Ga0.8Mg0.2O3 electrodes towards high performance symmetrical solid oxide fuel cells fabricated by an ultra-fast and time-saving procedure

Herein, the Sr2Fe1.5Mo0.5O6 (SFM) precursor solution is infiltrated into a tri-layered "porous La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM)/dense LSGM/porous LSGM" skeleton to form both SFM/LSGM symmetrical fuel cells and functional fuel cells by adopting an ultra-fast and time-saving procedure. The heating/cooling rate when fabricating is fixed at 200 degrees C/min. Thanks to the unique cell structure with high thermal shock resistance and matched thermal expansion coefficients (TEC) between SFM and LSGM, no SFM/LSGM interfacial detachment is detected. The polarization resistances (Rp) of SFM/LSGM composite cathode and anode at 650 degrees C are 0.27 Omega.cm(2) and 0.235 Omega.cm(2), respectively. These values are even smaller than those of the cells fabricated with traditional method. From scanning electron microscope (SEM), a more homogenous distribution of SFM is identified in the ultra-fast fabricated SFM/LSGM composite, therefore leading to the enhanced performance. This study also strengthens the evidence that SFM can be used as high performance symmetrical electrode material both running in H-2 and CH4. When using H-2 as fuel, the maximum power density of "SFM-LSGM/LSGM/ LSGM-SFM" functional fuel cell at 700 degrees C is 880 mW cm(-2). By using CH4 as fuel, the maximum power densities at 850 and 900 degrees C are 146 and 306 mW cm(-2), respectively. (C) 2017 Published by Elsevier B.V.