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The anodic performances of Ni/CeO 2 -Sm 2 O 3 (Ni/SDC) modified by the addition of alkaline earth metal oxides (MgO, CaO, SrO, and BaO) were investigated for direct oxidation of CH 4 in solid oxide fuel cells (SOFCs). Although the initial power density of cell with Ni/SDC anode modified by the addition of CaO (Ni-CaO/SDC) was slightly lower than that of cell with Ni/SDC, the former anode exhibited an excellent stability compared to the latter one. After continuous operation of SOFC for 24 h, no or less amount of carbon deposition was observed over Ni-CaO/SDC.

Both Ni and alkaline earth metal oxide (MO: CaO, SrO, and BaO)-impregnated SDC powders were prepared as an SOFC anode material. The averaged Ni particle size on SDC was affected by the kind of alkaline earth metal oxide added. The addition of SrO and BaO to Ni/SDC anode enhanced power densities of both H2-SOFC and CH4-SOFC and the addition of CaO lowered them. The maximum power density increased with decreasing the averaged Ni particle size of Ni-MO/SDC anode.