Synthesis and Electrochemical Properties of Sr3-Xprxfe1.8co0.2o7-Δ X= (0-0.3) Cathode for It-Sofcs

The oxides of the Ruddlesden-Popper (R-P) series, Sr3-xPrxFe1.8Co0.2O7-δ with x= (0-0.3) as cathodic materials for intermediate temperature solid oxide (IT-SOFCs) fuel cells were synthesized by the polymer complex technique. Investigations have been conducted into the effect of Pr and Co doping on thermal and electrical properties, catalytic activity in the oxygen-reducing reaction (ORR) in SOFC, and phase stability. The electrical conductivity, oxygen vacancies, electrocatalytic activity, and thermal expansion coefficient were all raised in the Co-substituted samples. Symmetric cell performance is enhanced at high temperatures even though Pr doping in the Sr site significantly decreases the coefficient of thermal expansion and oxygen loss. The Sr2.7Pr0.3Fe1.8Co0.2O7-δ cathode, which has an area-specific resistance (ASR) of 0.185 Ω.cm2 at 800˚C had the best catalytic activity for the ORR among the cathode materials studied. Following a test focused on long-term thermal stability, no impurity was detected as Sr3-xPrxFe1.8Co0.2O7-δ oxides were sintered at 800°C for 100 hours in the air.