Electrophoretic fabrication and cell performance of dense Sr- and Mg-doped LaGaO3-based electrolyte films

Abstract

Dense films of (La, Sr)(Ga, Mg)O3 compound, known as a superior oxide ion conductor, were fabricated successfully by electrophoretic deposition of the ceramic powders on graphite substrates followed by sintering with controlled heating profile. Thickness of the electrolyte films was varied in a range of ca. 40-80 μm with the deposition time. Ion conductivities of the films thus fabricated were 1.80 × 10-2 S/cm at 600°C and 5.75 × 10-2 S/cm at 730°C, and were comparable to those of bulky specimens prepared in a conventional manner. A single cell was constructed on the lanthanum gallate based film with doped lanthanum cobaltite for a cathode and Ni-yittria-doped ceria for an anode. Maximum output power densities of 0.34 W/cm2 at 600°C and 0.50 W/cm2 at 700°C were attained, respectively. © 2003 The Electrochemical Society. All rights reserved.