Preparation of La/Co/Ni-based anode catalyst for direct biogas-fueled solid oxide fuel cells

摘要

A new type of bilayered-anode for direct biogas-fueled SOFCs was investigated. The bilayered-anode consisted of lanthanum and cobalt-doped nickel oxide mixed with Sc_2O_3-stabilized ZrO_2 electrolyte (LaCoNi-ScSZ) as a functional catalyst layer mainly for reforming reaction and NiO-ScSZ as an active anode layer mainly for electrochemical reaction. The cell performance was characterized by measuring Ⅰ-Ⅴ curves and impedance spectra. The SOFC with the LaCoNi-ScSZ functional catalyst anode layer exhibited a power density of 0.32Wcm~(-2) when operated with a humidified synthetic biogas (60% CH_4 and 40% CO_2) at 700°C. The LaCoNi-ScSZ functional catalyst caused a high coking resistance and thus the cell was stable when operated with the synthetic biogas at 700°C for 45 h.