Chemical reactions between the superior perovskite oxide-ion conductor Sr- and Mg-doped LaGaO3 (LSGM), CeO2, 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 LaSrGa3O7 or LaSrGaO4. Use of 40 mol % La2O3 -doped CeO2 as an interlayer between anode and electrolyte as well as in the NiO-containing anode prevents all reactions found. Consequently, the air-H2 cell maximum power density was increased to nearly 900 mW/cm2 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/cm2.
Published in Journal of The Electrochemical Society, Volume 148, Issue 7, 2001, pages A788-A794.
©Journal of The Electrochemical Society 2001, The Electrochemical Society.
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Publisher’s Version: http://dx.doi.org/10.1149/1.1378289
Huang, K., Wan, J. H., & Goodenough, J. B. (2001). Increasing Power Density of LSGM-Based Solid Oxide Fuel Cells Using New Anode Materials. Journal of The Electrochemical Society, 148 (7), A788- A794. http://dx.doi.org/10.1149/1.1378289