Infiltrated La0.5Ba0.5CoO3-δ in La0.8Sr0.2Ga0.8Mg0.2O2.8 scaffolds as cathode material for IT-SOFC

摘要: Abstract The electrochemical response of infiltrated La0.5Ba0.5CoO3-δ (LBC) in porous La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM) has been investigated. thermal expansion coefficient (TEC) the resulting electrode was measured, obtaining α = 12.5 × 10−6 K−1, a value similar to that LSGM. polarization resistance (Rp) and processes involved oxygen reduction reaction (ORR) for new were studied analyzed through complex impedance spectroscopy measurements as function temperature partial pressure (pO2), using symmetrical cell. Rp LBC turned out be lower than measured an prepared with composite LBC-LSGM (1:1 wt%) by order magnitude, range 750 °C ≤ T ≤ 900 °C, about 5 times 450 °C≤ T ≤ 650 °C. At 600 °C, cathode exhibits = 0.22 Ω cm2, air. spectra show two processes, one identified low frequency (LF),with characteristic 10 Hz, other intermediate (IF), between 0.05 2000 Hz. LF process could associated diffusion gas phase pores electrode. Its resistance, RLF = 0.01 Ωc m2, found independent half obtained cathode. On hand, IF is related charge transfer at surface electrode-electrolyte interface. cobaltite LSGM scaffolds offers adequate good electrocatalytic activity ORR.