Abstract
Abstract Perovskite oxides (Bi 0.15 La 0.27 Sr 0.53 ) x (Co 0.25 Fe 0.75 )O 3-δ (BiLSCF x , x = 0.8, 0.9, 1.0, 1.1) have been synthesized by solid state reaction and evaluated as a novel cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The effects of A-site variations on lattice structure, calcination temperature, oxygen desorption and electrochemical properties of BiLSCF x are investigated. This kind of material has perfectly cubic structure based on the Pm -3 m space group whose lattice size increases with x , which is thermally stable after calcination and shows desirable chemical compatibility with La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ electrolyte at 1150 °C for 8 h under air atmosphere. Among those A-site variations, it is found that BiLSCF0.9 demonstrates the best cathode performance. It has the minimum polarization resistance value of 0.039 Ω cm 2 at 700 °C and α -oxygen desorbed about 0.031 mmol g −1 , indicating a good reactivity and strong adsorbate of O 2 . The single cell with BiLSCF0.9 cathode delivers a power density of 0.66 W cm −2 at 700 °C with humidified H 2 (∼3% H 2 O) as the fuel and ambient air as the oxidant. In addition, the cell shows sufficient stability with ∼9% degradation over 75 h at 600 °C. It indicates that BiLSCF0.9 is a promising candidate for application as cathode material in IT-SOFCs.
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