Preparation and characterization of Si-doped LaAlO3 solid electrolyte for IT-SOFCs

Abstract

In this paper, the nonmetallic Si[Formula: see text]-doped modified lanthanum aluminate (LaAlO3) solid electrolyte for the first time, which has particular scientific significance, and LaAl[Formula: see text][Formula: see text]Si[Formula: see text]O[Formula: see text][Formula: see text] material was successfully prepared by the sol–gel method. LaAl[Formula: see text]Si[Formula: see text]O[Formula: see text] is a ceramic material sintered at 1100[Formula: see text]C for 2 h in an air atmosphere. The surface microstructure and electrochemical properties of the samples were tested by multiple characterization methods. The results show that the LaAl[Formula: see text]Si[Formula: see text]O[Formula: see text] has good sintering activity, high crystallinity, and a grain radius of approximately 25 nm. At 800[Formula: see text]C, the ionic conductivity is above 1.05E− 04 S⋅cm[Formula: see text] and the activation energy is lower than 1.19 eV.