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

Abstract

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. © 2001 The Electrochemical Society. All rights reserved.

Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

“…The perovskite ionic conductor La 0.8 Sr 0.2 Ga 0.87 Mg 0.13 O 3 (LSGM) has been shown to be an excellent electrolyte candidate for SOFCs operating at intermediate temperatures. [6][7][8] Besides the electrolyte material, it has also been shown that the cathode material becomes the major obstacle in achieving high cell performance when lowering the cell operating temperature. 9 Generally speaking, the oxygen reduction process at the cathode is mainly responsible for the polarization loss of the fuel cell at intermediate temperatures.…”

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

“…There were LaSrGaO 4 and LaSrGa 3 O 7 precipitates detected when the composite cathode SSC-SDC/LSGMC was calcined on LSGM. La diffusion into CeO 2 -based materials is strongly suspected in this case due to previous research (28). Possible La diffusion into SSC-SDC powder could stem from LSGMC powder or LSGM pellet and could lead to a La deficiency in the LSGM phase.…”

Operational Inhomogeneities in La0.9Sr0.1Ga0.8Mg0.2O3–δ Electrolytes and La0.8Sr0.2Cr0.82Ru0.18O3–δ–Ce0.9Gd0.1O2–δ Composite Anodes for Solid Oxide Fuel Cells

“…Indeed, La diffused from LSGM into GDC during firing and the loss of La from LSGM likely contributes to de-stabilization of the perovskite phase, which exists over a relatively narrow composition range. Note that La loss occurs because GDC does not provide the high-La activity of LDC, which is sometimes used as a protective barrier layer with LSGM to avoid La loss and reactions with anode materials [15][16][17]. The present case where GDC, LSCrRu, and pores were in contact with the LSGM is also different than prior work where LDC was a continuous layer separating the LSGM and anode.…”