Tunable Electrode Architectures for La0.8Sr0.2Fe1-XTixO3- δ Based Symmetrical Solid Oxide Fuel Cells

Abstract

New strategies are necessary to enhance the efficiency of the electrodes for solid oxide fuel cells (SOFC) applications. Most of the preparation techniques require high sintering temperatures that drastically increases the grain size, leading to a very poor electrochemical activity. On this way, titanium doped ferrites have demonstrated to be promising electrodes, showing high redox stability and acceptable performance. In this study, spray-pyrolysis has been used to prepare nanostructured electrodes of La0.8Sr0.2Fe1- xTixO3-δ (x= 0.2 and 0.4) in a single deposition step. An infiltrated electrode architecture was obtained by depositing the electrodes directly on a porous Ce0.9Gd0.1O1.95 (CGO) backbone previously screen-printed onto a Zr0.84Y0.16O1.92 (YSZ) electrolyte. The properties of this electrode, in comparison with the traditional electrode, are investigated in both oxidizing and reducing conditions for the implementation of these electrodes in Symmetrical Solid Oxide Fuel Cells (SSOFC).