Fabrication of multilayer ceramic structure for fuel cell based on La(Sr)Ga(Mg)O3–La(Sr)Fe(Ga)O3 cathode

Abstract

Fabrication by co-sintering method of a multilayer pore-free electrode–electrolyte structure promising for use in solid-oxide fuel cell and its characteristics have been studied. A material with high ionic conductivity of La_0.88Sr_0.12Ga_0.82Mg_0.18O_3–δ (LSGM) served as electrolyte. The composite electrode was formed from a 1: 2 mixture of LSGM and LSFG (La_0.7Sr_0.3Fe_0.95Ga_0.05O_3–δ). The maximum temperature of the materials co-sintering ability is 1250°C. It was shown by the impedance spectroscopy that the polarization resistance of the LSGM–LSFG electrode is 0.14 Ω cm² at 800°C.