Porous YFe0.5Co0.5O3 thin sheets as cathode for intermediate-temperature solid oxide fuel cells

摘要

In this work, porous YFe0.5Co0.5,O-3 (YFC) thin sheets were-synthesized by citric acid method. The crystal structure, morphology, thermal expansion, electrical conductivity, and electrochemical properties of YFC were investigated to evaluate it as a possible cathode on BaZr0.1Ce0.7Y0.2O3 (BZCY) electrolyte for intermediate-temperature solid oxide fuel cells (ITSOFCs). An orthorhombic perovskite structure was observed in YFC. The conductivity of YFC is 183 S cm (-1) at 750 degrees C in air. The coefficient of thermal expansion of composite cathode YFC-BZCY is closer to BZCY electrolyte than YFC. The composite cathode represents a relatively low polarization resistance (R-P) of 0.07 Omega cm(2) at 750 degrees C in air due to the porous thin sheet-like cathode. The oxygen reduction reaction process and the reaction activation energy of cathode were also analyzed. An anode-supported cell of NiO-BZCY IBZCY IYFC-BZCY is fabricated by a simple method of co-pressing. The power density of the cell is 303 mW cm(-2) at 750 degrees C as the thickness of electrolyte is 400 mu m. The results suggest that YFC is a promising cathode candidate for IT-SOFC. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.