International Journal of Hydrogen Energy, Vol.45, No.38, 19831-19839, 2020
A highly stable cobalt-free LaBa0.5Sr0.5Fe2O6-delta oxide as a high performance cathode material for solid oxide fuel cells
The expedition of cathode materials with high stability, superior catalytic activity and better electrochemical performance is critical for realizing the commercial application of solid oxide fuel cells. Herein, we report a cobalt-free LaBa0.5Sr0.5Fe2O6-delta oxide as the cathode material and systematically evaluate its physical and electrochemical properties. The research results indicate that this material exhibits the perovskite-typed structure and possesses a good high-temperature chemical compatibility and interface stability with the Ce0.8Sm0.2O1.9 electrolyte. At 750 degrees C, theLaBa(0.5)Sr(0.5)Fe(2)O(6-delta) cathode shows the lowest polarization resistance and the maximum power density with the values of 0.152 Omega cm(2) and 370 mWcm(-2), respectively. Furthermore, there is almost no significant change in the polarization resistance and output power density during the 100 h stability test. The oxygen partial pressure dependence studies indicate that the determining steps are the transfer process of oxygen ions from the cathode to the electrolyte, the charge-transfer process and the adsorption process of oxygen molecules on the electrode surface. The preliminary results suggest that the LaBa0.5Sr0.5Fe2O6-delta oxide is expected to be a promising cathode material for solid oxide fuel cells. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.