POWER GENERATION CHARACTERISTICS OF SOFC WITH CERIA AND ZIRCONIA-BASED ELECTROLYTE

摘要

Ceria-based oxides were investigated as an electrolyte for SOFC, especially aiming at low temperature operation of the cell. A coating of YSZ layer on the anode side surface of samaria-doped ceria (SDC) was effective in deriving a large power. The role of this YSZ layer was revealed to be mainly blocking of the electronic conduction. Even when the SDC surface was reduced, the blocking electrode gave rise to a high output voltage. The blocking cell was also fabricated by dispersing SDC particles in a matrix of YSZ. The control of SDC content and the particle size significantly affected the power generation characteristics of the cell with this composite electrolyte. The use of SDC-based electrolyte was effective in reducing both IR drop and electrode polarization.