Abstract
Redox stable SrFe0. 75Mo0. 25O3-δ (SFM) and SrFe0.5Mn0.25Mo0. 25O3-δ (SFMM) anode materials show simple perovskite cubic structure in air, while SFMM transforms to B-site cation-ordered perovskite after reduction in 5 vol.% H2/Ar at 1100 °C. Over 2% mass changes were recorded for this materials during annealing in 5 vol.% H2/Ar atmosphere, indicating oxygen nonstoichiometry δ changes exceeding 0.2 mol·mol-1. Moreover, both oxides exhibit p-type conductivity in air, while n-type in 5 vol.% H2/Ar atmosphere. For 60 wt.% SFM and 40 wt.% CGO anode composite, no carbon deposition was observed in 10 vol.% CO/ CO2. In CH4 atmosphere, although coking occurs at 800 °C, usage of composite-type anodes with addition of CGO electrolyte can suppress the carbon deposition. Interestingly, no carbon deposition takes place at 600 °C for pure SFM, SFMM or composite anodes. The fuel gas composition and content of CGO in the anode material, as well as temperature significantly affect the coking issue.
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