Characterization of Ba_(1.0)Sr_(1.0)FeO_(4+

摘要

Ba_(1.0)Sr_(1.0)FeO_(4+sized through an ethylene diamine tetraacetic acid (EDTA)-citrate process, and characterized by X-ray diffraction. Field emission scanning electron microscopy shows that BSFO cathode is well attached to the La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-ectrolyte. The electrical conductivity measured by DC four-probe method increases as the temperature increases. A linear relationship between ln(骉) and 1000/T indicates that the conducting behavior obeys the small polaron conductivity mechanism. Electrochemical performance of BSFO cathode on LSGM electrolyte is investigated in the temperature range from 500 ℃ to 800 ℃. The results indicate that oxygen adsorption/dissociation process dominates cathodic reaction. Furthermore, the polarization resistance of BSFO cathode decreases with increasing temperature, and declines to 1.42 賑m~2 at 800 ℃. These results show that BSFO can be a promising cathode material used on LSGM electrolyte for IT-SOFCs.