Abstract
Abstract As a mixed oxygen ionic and electronic conductor, SrFe 0.8 Mo 0.2 O 3- δ is confirmed to be a good cathode material for intermediate-temperature solid-state fuel cells (IT-SOFCs). The sample of SrFe 0.8 Mo 0.2 O 3- δ is synthesized by a solid-state reaction method. Pure cubic SrFe 0.8 Mo 0.2 O 3- δ perovskite, with space group of Pm-3 m (no. 221) and lattice parameter a = 3.9120(1) A, is determined via Powder X-ray Rietveld refinements. X-ray photoelectron spectroscopy testifies the existence of mixed oxidation states Fe 2 +/3 +/4 + and Mo 5 +/6 + in the crystal. Thermogravimetry analysis consistently shows that the SrFe 0.8 Mo 0.2 O 3- δ begins to the loss of lattice oxygen at about 450 °C, which overlaps to the inflection temperature of the electrical conductivity profile. The maximum electrical conductivity obtained is about 50.20 S cm − 1 at 450 °C, and the impedance 0.11 Ω cm 2 at 850 °C. The performance demonstrates that SrFe 0.8 Mo 0.2 O 3- δ is a potential candidate as a cathode material for IT-SOFCs.
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