Abstract
Conventional Ni-cermet anode shows poor redox stability with the repeated oxidation in air and reduction in H2 due to resultant Ni coarsening. They also show degradation due to carbon-coking when exposed to hydrocarbon (e.g., CH4) fuels. In this study, we prepared La0.2Sr0.7Ti0.9Ni0.1O3-δ (LSTN)-Gd0.2Ce0.8O2-δ (GDC) (2-phase composite) of SOFC, or LSTN-GDC-Ni (3-phase composite) and tested their redox stability at 600 °C as SOFC (solid oxide fuel cell) anodes.The electrolyte (Sc-stabilized zirconia)-supported cells with LSTN-GDC or LSTN-GDC-Ni anodes exposed to wet H2 show comparable performance (i.e., polarization resistance and power density) to that of cell with conventional Ni-GDC anode. However, during 10 redox cycles (1 h in air + 25 h in H2), they show much better stability with little degradation in Ohmic and polarization resistance values than Ni-GDC anode. The cells with LSTN-containing composite anodes, with or without Ni, exposed to CH4 also show improved performance compared to the cell with Ni-GDC anode.
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