Abstract
Mixed ionic-electronic conductor LSCF is a popular cathode material for intermediate to low temperature solid oxide fuel cells; nevertheless, there are concerns about its surface-limited oxygen reduction reaction. In this work, Ruddlesden-Popper-structured La2NiO4+δ (LNO) nanoparticles are introduced onto the surface of (La0.6Sr0.4)0.995Co0.2Fe0.8O3-δ (LSCF) cathode and the electrode performance is examined by means of electrochemical impedance spectroscopy (EIS) in the temperature range of 550–750 °C. Impedance spectra analysis shows that an 81% reduction in polarization resistance can be achieved by infiltration of LNO nanoparticles. The distribution of relaxation times (DRT) technique is used to gain insights on the physicochemical properties of the system under study. Obtained results reveal that by correlating oxygen surface exchange, bulk diffusivity, ionic conduction, and particle size of nano-structured LNO with the electronic and ionic conductivity of LSCF, the electrochemical behavior of the cathodes is improved.
Published Version
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