Abstract
A novel cobalt-free double-perovskite oxide NdBaFe1.9Nb0.1O5+δ (NBFNb10) was prepared by a solid-state reaction method and investigated as a suitable cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). It was discovered that partial substitution of Nb for Fe-site further enhanced the electrical conductivity of NdBaFe2O5+δ (NBF). The NBFNb10 exhibited the highest conductivity of 109Scm−1 at 300–800°C in air, and showed good chemical compatibility with the BaZr0.1Ce0.7Y0.2O3−α (BZCY) electrolyte. A single cell with the NBFNb10–BZCY composite cathode and NiO–BZCY composite anode-supported BZCY electrolyte membrane (ca. 30μm thickness) was fabricated and tested at 500–700°C using H2 as fuel and air as oxidant. The peak power density and the interfacial polarization resistance (Rp) were 392mWcm−2 and 0.14Ωcm2 at 700°C, respectively.
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