Abstract
Abstract The perovskite Sm0.9Sr0.1Fe0.9Ru0.1O3-δ (SSFR) is synthesized and investigated as a new type of symmetrical electrode material for solid oxide fuel cells (SOFCs). X-ray diffraction analysis indicates that SSFR exhibits an orthorhombic structure with a space group of Pnma (62). There are no significant changes in polarization resistance (Rp) after a series of experiments in hydrogen and oxygen atmospheres at 800 °C, implying that SSFR has a good redox stability. To get an insight into the rate-limiting steps of SSFR electrode, behavior of Rp is investigated in different oxygen partial pressures (pO2). Generally, the relationship between Rp and pO2 follows the equation Rp = k(pO2)−n and different n values correspond to different rate-limiting steps. In this study, the n value of 0.5 is obtained for SSFR cathode at high temperature, relating to the diffusion of oxygen atom. In high pO2, SSFR presents a p-type conducting behavior, with decreasing pO2, a p–n transition occurs in the range 10−17 to 10−18 atm. Additionally, peak power density of the Sm0.2Ce0.8O1.9 (SDC, ∼0.6 mm) electrolyte-supported symmetrical cell SSFR|SDC|SSFR achieves 119.69 mW cm−2 at 800 °C using humidified hydrogen (∼3% H2O) as fuel.
Published Version
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