La0.6Sr0.4Co0.2Fe0.8O3-δ nanofiber cathode for intermediate-temperature solid oxide fuel cells by water-based sol-gel electrospinning: Synthesis and electrochemical behaviour

Abstract

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Electrochemical Impedance Spectroscopy of Electrospun La0.6Sr0.4Co0.2Fe0.8O3–δ Nanorod Cathodes for Intermediate Temperature – Solid Oxide Fuel Cells

“…Figure shows that the cross‐section at the electrode‐electrolyte interface exhibits a structure similar to the top view presented in Figures c and d. In Figure b It is clearly visible that, at the electrode‐electrolyte interface, the nanofibers have an architecture different from that adopted in a previous work , where the unbroken LSCF fibers were laying neatly in the same plane as the electrolyte, adhering to it and covering it for a large extent. Instead, here, the LSCF nanorods are randomly oriented with respect to the electrolyte, with some nanorods perpendicular to the GDC electrolyte being clearly visible.…”

“…The second heat treatment, i.e., firing applied to the final symmetrical cells, is slightly different. Indeed, the symmetrical cells employing the unbroken nanofiber electrodes are fired in situ in the electrochemical testing equipment, at the maximum temperature of 1,223 K for 3 h . The symmetrical cells employing the nanorod electrodes are fired in a furnace following the thermal profile reported in Sect.…”

“…The LSCF internal composition (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ ) is identical in both cases. The heat treatment applied to the just‐electrospun fibers is identical as well , , . The second heat treatment, i.e., firing applied to the final symmetrical cells, is slightly different.…”

“…In a previous paper , pristine La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ (LSCF) prepared through an original water‐based sol‐gel electrospinning method were investigated. The LSCF nanofiber electrodes were coupled to the Ce 0.9 Gd 0.1 O 1.95 (GDC) electrolyte discs with an innovative method, which preserved the integrity of the nanofibers along their whole length, and promoted their adhesion to the GDC electrolyte.…”

“…The aim of the present paper is twofold. On the one hand, we aim at comparing the performance obtained from two LSCF electrodes with different architecture: the 3‐D stochastic nanorod structure investigated here and the unbroken nanofibers laying neatly in‐plane over the GDC electrolyte investigated previously . On the other hand, using the new set of electrochemical impedance spectroscopy (EIS) experimental data, we take the opportunity to further test and compare the previously discussed EC models .…”