Abstract
In this work, a Solid Oxide Fuel Cell (SOFC) cathode surface modification by nanoparticle impregnation was carried out. La0.6Sr0.4Co0.8Fe0.2O3-δ –LSCF– ceramic cathodes impregnated with Ce0.8Gd0.2O3-δ –GDC– nanoparticles were characterized with scanning –SEM– and transmission –TEM– electronic microscopy. The electrochemical response as a function of temperature, oxygen partial pressure –pO2– (10-4 < pO2< 1 atm) and time was evaluated by electrochemical impedance spectroscopy –EIS–. We obtained reproducible and homogeneous impregnations, which reduce the total cathode´s polarization resistance more than 20% in the temperature range between 400ºC and 800ºC and during 500 h at 700ºC. The impregnated cathode was found to be electrochemically limited by the same processes as the non-impregnated cathode, namely gas diffusion, ion bulk diffusion and dissociative adsorption. The impregnation produced a reduction of more than 20% of the oxygen surface resistance, such difference remained stable through 500h of continuous operation at 700ºC.
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