Abstract
A solid-oxide electrochemical cell (SOC) that converts fuel to electricity back and forth is a possible large-scale storage technique for the renewable energy. Mixed ion-and-electron-conducting (MIEC) perovskites with Sr2+ as aliovalent dopants are proposed as the oxygen electrode to alleviate the degradation as in the conventional Sr-doped LaMnO3. However, the high mobility of Sr2+ cation under an electric current, poor chemical compatibility with the yttria-stabilized zirconia (YSZ) of the MIEC perovskites could lead to the loss of long-term performance of the cell stacks. In this study, a novel Sr-free MgO-doped LaFeO3 (La0.95Fe0.7Mg0.3O3-δ) showing an acceptable chemical compatibility with YSZ and high stability under anodic/cathodic current is proposed as the oxygen electrode for an SOC. A polarization resistance of 1.75 Ωcm2 at 700 °C was observed for the single-phase electrode and the value could be decreased to 0.75 Ωcm2 if a nanostructured composite electrode with YSZ was prepared using an infiltration technique.
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