La_0.85Sr_0.15MnO₃-Ce_0.7Bi_0.3O₂(LSM-CBO) composite electrode for ITSOFC (intermediate temperature solid oxide fuel cell) has been prepared by citrate-gel method. XRD results indicate that LSM has no reaction with CBO at 1000℃ in air. SEM results show that the composite electrode formed good contact with Ce_0.9Gd_0.1O₂(CGO) electrolyte after sintered at 900℃ for 2 h. The composite electrode remained unchanged even after heat treatment at 700℃ and 0.6 V cathode potential for 96 h. AC impedance spectroscopy and DC polarization measurements were used to study the composite electrode performances. The polarization resistance decreased with increasing CBO contents. The optimum value of 30 wt% CBO in LSM resulted in 2.23 Ω·cm² area specific resistivity (ASR) at (700℃) in air, which indicates that the LSM-CBO composite electrode is a promising cathode material in ITSOFC.

Key words: intermediate temperature solid oxide fuel cell(ITSOFC), composite cathode material, LSM-CBO, electrode reaction