La[sub 0.4]Sr[sub 0.6]Ti[sub 1−x]Mn[sub x]O[sub 3−δ] Perovskites as Anode Materials for Solid Oxide Fuel Cells | Zendy

Qingfeng Fu | Zendy; Frank Tietz | Zendy; D STOVER | Zendy

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La[sub 0.4]Sr[sub 0.6]Ti[sub 1−x]Mn[sub x]O[sub 3−δ] Perovskites as Anode Materials for Solid Oxide Fuel Cells

Author(s) -

Qingfeng Fu,

Frank Tietz,

D STOVER

Publication year - 2006

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/1.2170585

Subject(s) - anode , materials science , solid oxide fuel cell , electrolyte , yttria stabilized zirconia , oxide , electrochemistry , perovskite (structure) , cathode , hydrogen , inorganic chemistry , methane , chemical engineering , polarization (electrochemistry) , cubic zirconia , hydrogen fuel , electrode , chemistry , metallurgy , ceramic , engineering , organic chemistry

Perovskite oxides, La0.4Sr0.6Ti1-xMnxO3-delta (x=0, 0.2, 0.4, 0.6), have been investigated in the search for new solid oxide fuel cell (SOFC) anode materials. La0.4Sr0.6Ti0.4Mn0.6O3-delta (LSTM4646) shows an electrical conductivity of 22.6 S/cm in air and 1.5 S/cm in wet Ar/4% H-2 [p(O-2)approximate to 10(-18) bar] at 810 degrees C. It is thermally and chemically compatible with yttria-stabilized zirconia (YSZ) electrolytes. Three processes govern the electrochemical performance of LSTM4646/YSZ anodes in wet Ar/H-2 or wet CH4. They are proposed to be charge transfer at the LSTM4646/YSZ interface, dissociative adsorption of hydrogen on the electrode surface, and gas conversion impedance, respectively. Due to the low polarization resistance of the LSTM4646/YSZ anode, 0.32 Omega cm(2), an electrolyte-supported H-2/air fuel cell with an LSM/YSZ cathode yields a power density of 365 mW cm(-2) at 0.7 V at 856 degrees C. In addition, this anode material is stable under a moderately humidified hydrogen atmosphere. It shows insignificant catalytic activity for the direct oxidation of methane however

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