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article
LSF films formed on YSZ electrolytes via polymeric precursor deposition for solid oxide fuel cell anode applications
Abstract
<p>Different materials have been applied as anode in solid oxide fuel cell (SOFC). Perovskite structured materials are promising as an alternative electrode material to Ni. Here, we investigated perovskite-structured mixed ionic and electronic conducting material, lanthanum strontium ferrite (LSF), which has typically been used as a cathode material. LSF has also shown potential for an anode in SOFC. LSF films with two different compositions, La<sub>0.6</sub>Sr<sub>0.4</sub>FeO<sub>3</sub> (6LSF) and La<sub>0.8</sub>Sr<sub>0.2</sub>FeO<sub>3</sub> (8LSF) were fabricated by a polymeric precursor method. The effects of the phase content, surface chemistry, and microstructure on the anode performance were investigated. It was found that a mixture of the Ruddlesden–Popper phase, SrCO<sub>3</sub> phases, and rhombohedral perovskite exists in both cell structures. Both cells had Ruddlesden–Popper and SrCO<sub>3</sub> phases at their surface, in addition to the rhombohedral perovskite. Symmetrical half-cell measurements showed that the polarization resistance of 6LSF (0.34 Ω cm<sup>2</sup>) is lower than that of 8LSF (0.47 Ω cm<sup>2</sup>), mostly because of its highly porous microstructure as a result of slower A-site diffusion rates induced by higher Sr content. The symmetrical 6LSF fuel and air electrodes exhibited ASR<sub>electrode</sub> values of 0.34 and 0.14 Ω cm<sup>2</sup>, respectively, at 800 ˚C.</p>