Development of Ni-Fe based cermet anode for direct CH₄ fueled intermediate temperature SOFC using LaGaO₃ electrolyte

Cermet anode of NiFe(9:1)-La_0.9Sr_0.1Ga _0.8Mg_0.2O₃ (LSGM) was studied for direct CH₄ fueled SOFC operating at intermediate temperature. In case of NiFe bimetal anode, power density of the cell decreased drastically in CH ₄. On the other hand, mixing Sm doped CeO₂, MgO, or LSGM is effective for improving the long-term stability. The cell with NiFe-LSGM anode exhibited much stable power density under CH₄ feeding condition. At 1073K, the maximum power density of the cell using NiFe-LSGM anode is achieved a value of 0.48 W/cm², and after 15 hours operation, degradation in the power density is slightly observed. However, stability in the power density is much improved. Deposition of coke is also hardly detected by Raman spectroscopy, and so it was found that NiFe-LSGM10 shows a high tolerance against the coke deposition.