Abstract
Carbon resistant and redox stable anodes have been intensively studied aiming at effective fuel-flex solid oxide fuel cells. Previous studies have demonstrated that the La0.75Sr0.25Cr0.50Mn0.50O3 (LSCM) perovskite has comparable performance in both hydrogen and methane fuelled SOFCs. In the present study, LSCM compounds with partial substitutions of either Mn or Cr by Ru (LSCM-Ru) were synthesized and characterized. Thermal analysis and X-ray diffraction were used to study the thermal evolution of precursor resins and phase formation. The electrical properties were investigated by 4-probe measurements in the 25 °C - 800 °C temperature range. X-ray diffraction data evidenced that single phase compounds were obtained at 1200 °C, without significant structural distortions up to ~ 10 at.% of Ru. The electrical resistivity data showed that the transport properties depend on the substituted cation. In addition, the formation of Ru nanoparticles on the surface of LSCM-Ru grains, suggest that LSCM-Ru compounds have enhanced catalytic activity for carbon containing fuels.
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