Titanium-substituted lanthanum strontium ferrite as a novel electrode material for symmetrical solid oxide fuel cell

摘要

In this study, La(0.3)Sr(0.7)Ti(0.3)Pe(0.7)O(3.delta) (LSTF) is evaluated as a novel symmetrical electrode on SDC(Sm0.2Ce0.8O1.9)-YSZ(yttria-stabilized zirconia)-SDC three-layer electrolyte. Impedance spectroscopy results indicate the polarization resistances of anode and cathode are 0.18 and 0.04 Omega cm(2) at 900 degrees C, respectively, suggesting that the micron-scale LSTF possesses high electrocatalytical activity for both oxygen reduction and hydrogen fuel oxidation reactions. A single cell consisting of LSTF symmetrical electrode and YSZ electrolyte support (similar to 400 mu m) shows a maximum power density (MPD) of 374 mW cm(-2) at 900 degrees C using wet H-2 as fuel. Furthermore, the LSTF electrode shows good short-term stability in wet H-2 at 800 degrees C and reliable redox stability during the repeated redox cycles. The present results indicate that the La0.3Sr0.7Ti0.3Fe0.7O3-delta is a promising electrode material for symmetrical SOFCs. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.