Nanostructured Lanthanum Manganate Composite Cathode

摘要

Anode-supported cells were fabricated with optimized cathodes showing high power density of 1.2 W/cm~2 at 800 deg C under a cell voltage of 0.7 V and an active area of 4 X 4 cm. A microstructure study was performed on such cell using a field-emission gun scanning electron microscope, which revealed that the (La_(1-x)Sr_x)_yMnO_(3+ - theta) (LSM) composite cathodes consist of a network of homogenously distributed LSM, yttria-stabilized zirconia (YSZ), and pores. The individual grain size of LSM or YSZ is approximately 100 mn. The degree of contact between cathode and electrolyte is 39 percent on average.