Effects of infiltrated Sr and Mn doped LaCrO3 on porous La0.8Sr0.2Ga0.8Mg0.2O3-δ scaffolds used as anodes in solid oxide fuel cells

Abstract

The phase stability and electrochemical properties of infiltrated anode catalysts on porous La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) scaffold are investigated for possible applications as anode materials for an intermediate temperature-operating solid oxide fuel cell (IT-SOFC). To avoid the formation of secondary phases between the anode and the LSGM electrolyte, an infiltration method is proposed on the porous LSGM scaffold. No secondary phases between the infiltrated La0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) catalyst and the LSGM are observed at 900 °C. However, LaSrGa3O7, LaSrGaO4 and other unknown secondary phases are formed above the calcination temperature of 1000 °C when LSCM was infiltrated on porous LSGM scaffolds. The current (I)–voltage (V) characteristics are measured in an LSGM electrolyte single cell with a Ba0.5Sr0.5Co0.2Fe0.8O3-δ (BSCF) cathode and LSCM infiltrated into the LSGM scaffold type anode. The maximum power density of the single cell is 0.214 W cm− 2 at 800 °C.