Abstract
Four kinds of anodes, Ni-Mo(3%)/, Ni-W(3%)/, Ni-Ta(3%)/ and Ni-Nb(3%)/Sm0.2Ce0.8O2 (SDC) were prepared by impregnating Mo, W, Ta and Nb precursor solutions into pre-sintered Ni/SDC cermets. Their anode performance was evaluated in ammonia-fueled SOFCs at 973-1173 K to clarify the correlation between nitride formation and anode activity. The addition of Mo, W and Ta enhanced the anode activity for NH3 oxidation, but Nb did not. Under the operation conditions (i.e. at 973-1173 K in NH3), MoO3, WO3 and Ta2O5 reacted with NH3 to form nitrides (Mo2N, W2N and TaON), but Nb2O5 did not. These results suggest that the easiness of the nitride formation is closely related to the high activity anode for NH3 oxidation.
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