Superior Perovskite Oxide‐Ion Conductor; Strontium‐ and Magnesium‐Doped LaGaO₃: III, Performance Tests of Single Ceramic Fuel Cells

Abstract

The performance of La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 2.815 (LSGM) as an optimized electrolyte of a solid oxide fuel cell was tested on single cells having a 500-µm-thick electrolyte membrane. The reactivity of NiO and LSGM suggested use of an interlayer to prevent formation of LaNiO 3 . The interlayer Sm-CeO 2 was selected and sandwiched between the electrolyte and anode. Comparison of Sm-CeO 2 /SmCeO 2 + Ni and Sm-CeO 2 + Ni as anodes showed that SmCeO 2 /Sm-CeO 2 + Ni gave an exchange current density 4 times higher than that of Sm-CeO 2 + Ni. The peak power density of the interlayered cell is 100 mW higher than that of the standard cell without the interlayer. This improvement is due to a significant reduction of the anode overpotential; the overpotential of the cathode La 0.6 Sr 0.4 CoO 3−␦ (LSCo) remained unchanged. Comparison of the peak power density in this study and with that of a previous study, also with a 500-µm-thick electrolyte, indicates a factor of 2 improvement, i.e., from 270 mW/cm 2 to 550 mW/cm 2 at 800°C. The excellent cell performance showed that an LSGM-based thick membrane SOFC operating at temperatures 600°< T op < 800°C is a realistic goal.

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

“…According to the previous report, 29 an LDC interlayer was applied between the anode and electrolyte to prevent reactions between LSGM and Ni. The I-V and I-P curves obtained at different temperatures with H 2 as the fuel and ambient air as the oxidant are shown in Fig.…”

Evaluation of GdBaCo2O5 + δ as Cathode Material for Doped Lanthanum Gallate Electrolyte IT‐SOFCs

“…Perovskite type oxides, ABO 3 , have been extensively studied as cathodes in SOFCs. In addition, doped lanthanum gallate perovskites have also been considered as alternative electrolyte materials for IT-SOFCs [4], e.g. La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 (LSGM) [5,6] with a typical ionic conductivity of 0.1 Scm -1 at 1,073 K.…”

LSM-YSZ Cathodes with Reaction-Infiltrated Nanoparticles

“…To reduce costs, lowering of the SOFC operating temperatures has been widely pursued to expand the materials selection, to suppress the degradation of SOFC components, and consequently to extend cell lifetime (3)(4)(5)(6)(7). Unfortunately, with decreasing temperatures the low oxygen ion diffusivity and reduced catalytic activity of LSM tends to limit cell performance (8,9).…”