Increasing Power Density of LSGM-Based Solid Oxide Fuel Cells Using New Anode Materials

Chemical reactions between the superior perovskite oxide-ion conductor Sr- and Mg-doped (LSGM), and NiO have been studied by powder X-ray diffraction. The results showed that an extensive reactivity occurs as a result of La migration driven by a gradient of La chemical activity. La migration across the LSGM/electrode interfaces in a fuel cell leads to the formation of resistive phases at the interface, either or Use of 40 mol % -doped as an interlayer between anode and electrolyte as well as in the NiO-containing anode prevents all reactions found. Consequently, the air- cell maximum power density was increased to nearly 900 mW/cm 2 at 800°C with a 600 μm thick LSGM electrolyte. No sign of degradation was observed at 800°C over 2 weeks for an interlayered cell under a loading current density of 250 mA/cm 2 . © 2001 The Electrochemical Society. All rights reserved.