Effects of Nitride Formation on Anode Catalytic Activity in Ammonia-Fueled SOFCs. (2nd June 2015)

• Record Type: Journal Article
• Authors: Yokochi, Ryuji; Hashinokuchi, Michihiro; Doi, Takayuki; Inaba, Minoru
• Is Part Of: ECS transactions. Volume 68:Number 1(2015)
• Page Start: 2745
• Page End: 2750
• Publication Date: 2015-06-02
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06801.2745ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Four kinds of anodes, Ni-Mo(3%)/, Ni-W(3%)/, Ni-Ta(3%)/ and Ni-Nb(3%)/Sm0.2 Ce0.8 O2 (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 Ta2 O5 reacted with NH3 to form nitrides (Mo2 N, W2 N and TaON), but Nb2 O5 did not. These results suggest that the easiness of the nitride formation is closely related to the high activity anode for NH3 oxidation.