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

C. SETEVICH; S.A. LARRONDO.; F. PRADO

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2018

0272-8842

The electrochemical response of infiltrated La0.5Ba0.5CoO3-d (LBC)in porous La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM) has been investigated. The thermal expansion coefficient (TEC) of the resulting electrode was measured, obtaining alpha = 12.5 × 10-6 K-1, a value similar to that of LSGM. The polarization resistance (Rp) and the processes involved in the oxygen reduction reaction (ORR) for the new electrode were studied and analyzed through complex impedance spectroscopy measurements as a function of temperature and oxygen partial pressure (pO2), using a symmetrical cell. The value of Rp for the infiltrated LBC turned out to be lower than that measured for an electrode prepared with a composite LBC-LSGM (1:1 wt.%) by an order of magnitude, for the temperaturerange 750°C ≤ T ≤ 900 °C, and about 5 times lower for the temperature range 450°C≤ T ≤ 650 °C. At 600 °C, the LBC infiltrated cathode exhibits a polarization resistance Rp = 0.22 Ωcm2, in air. The complex impedance spectra show two processes, oneidentifiedas low frequency (LF),with a characteristic frequency of 10 Hz, andthe other as intermediate frequency (IF), with a range between 0.05 -2000 Hz. The LF process could be associated to the diffusion of oxygen in the gas phase through the pores of the electrode. Its resistance, RLF = 0.01 Ωcm2,was found to be independent of the temperature and half of that obtained for the LBC composite cathode. On the other hand, the IF process is related to charge transfer at the electrode surface and the electrode-electrolyte interface. The LBC cobaltite infiltrated in the LSGM scaffolds offers an adequate thermal expansion coefficient and good electrocatalytic activity for the ORR.