Ni-Fe-LaGaO_3 based Alloy Anode Cermet for Direct Hydrocarbon type Solid Oxide Fuel Cell using LaGaO_3 Electrolyte

摘要

Cermet anode of NiFe(9:1)-La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_3 (LSGM) (90:10 weight ratio) was studied for direct CH_4 fueled SOFC operating at intermediate temperature. In case of NiFe bimetal anode, power density of the cell decreased drastically after operation under CH_4 feeding condition. On the other hand, mixing Sm doped CeO_2, MgO, or LSGM is effective for improving the long term stability. The cell with NiFe-LSGM anode exhibited much stable power density under CH_4 feeding condition. Deposition of coke was also studied by Raman spectroscopy and no coke deposition was observed after 15 h operation. Since the surface activity of this anode is high, power density was hardly dependent on P_(CH_4). It was found that NiFe-LSGM10 shows a high tolerance against the coke deposition under CH_4 feeding condition.