Liquid-Solid Reaction Method to Synthesize La0.7Sr0.3MnO3 Powder as Cathode for Solid Oxide Fuel Cell

Abstract

La_0.7Sr_0.3MnO₃ powders were prepared by liquid-solid reaction method using humidified (3 % H₂O) hydrogen as fuel and ambient air as oxidant. These powders were evaluated in terms of phase structure, morphology and fuel cell performances. An electrolyte-supported solid oxide fuel cell was prepared in a conventional manner. The results showed that the formation of La_0.7Sr_0.3MnO₃ perovskite phase was acquired at 1100 ºC for 5 h. The particles of the powders were uniform and were about 0.1-0.3 μm. At 750 ºC, the maximum power density of a single cell with La_0.7Sr_0.3MnO₃ powder were 135 mW cm^-2.