Study of electrode performance for nanosized La0.4Sr0.6Co0.8Fe0.2O3-d IT-SOFC cathode

LILIANA MOGNI; K.YAKAL-KREMSKI; C. M. CHANQUIA; Z. GAO; H.WANG; ALBERTO CANEIRO; S.A.BARNETT

Chicago

Congreso; 227th Electrochemical Society Meeting; 2015

Electrochemical Society

La0.4Sr0.6Co0.8Fe0.2O3-d (LSCF4682) perovskites were successfully synthesized by an assisted ammonium nitrate combustion method. The sample shows a sponge-like structure with meso and macro-poreschannels distributed between interconnected nanosized particles (~45 nm) with a high specific surface area. Cathode performance of LSCF4682 was investigated in the intermediate temperature range of 400°C-700°C by using symmetrical cell configuration on La0.8Sr0.2Ga0.8Mg0.2O3-d(LSGM) electrolyte. The cathode polarization resistances Rc,pare 0.067 and 0.035 Ohm cm2 at 600°C and 700 °C, respectively. The long-term behavior of Rc,p was studied by applying an accelerate aging at 800 °C and testing the polarization resistance at 700°C as a function of time.After 500 h of aging,a degradation rate of 1/R_(C,P) (dR_(C,P))/dt = 0.002 h-1raises the Rc,p to 0.1 Ohm cm2 at 700°C.A maximum power density of 1.23 Wcm-2 was achieved at 650 °C testing the LSCF cathode deposited on a porous SLT LSGM supported multilayer cell.Theresults demonstrate that this material is a competitive SOFC cathodes for the intermediate temperature operation.