1.95La 0.05CuO 4–Ce 0.9Gd 0.1O 1.95 for Intermediate Temperature Solid Oxide Fuel Cells]]>

摘要

The electrochemical properties are studied for composite electrodes Pr~(1.95)La~(0.05)CuO~(4)(PLCO)– x Ce~(0.9)Gd~(0.1)O~(1.95)(GDC), where x = 20, 30, 40, and 50 wt % GDC with the aim of finding the composition with the best electrochemical efficiency in the oxygen reduction reaction. Varying the temperature of sintering of the PLCO– x GDC electrode layer to the surface of GDC solid electrolyte shows that the minimum polarization resistance ( R ~(η)) is reached at the temperature of 850°C. For the PLCO– x GDC composition containing 40 wt % GDC, in the temperature range of 600–750°C, the maximum electrochemical activity in oxygen reduction reaction is observed as indicated by 10-fold decrease in R ~(η)as compared with single-phase PLCO (from 0.87 ( x = 0) to 0.08 Ω cm_(2)( x = 40) at 700°C in air). According to the data obtained, the PLCO–40GDC composite can be considered as a promising cathode material for intermediate temperature solid oxide fuel cells.