La0.4Sr0.6Ti1-xMnxO3-d Perovskites as New Anode Materials for Solid Oxide Fuel Cells

Fu, Q. X.; Stöver, D.; Tietz, F.

doi:10.1149/1.2170585

Journal Article

PreJuSER-52191

La0.4Sr0.6Ti1-xMnxO3-d Perovskites as New Anode Materials for Solid Oxide Fuel Cells

Fu, Q. X.FZJ* ; Tietz, F.FZJ* ; Stöver, D.FZJ*

2006
Electrochemical Society Pennington, NJ

Journal of the Electrochemical Society 153, D74 - D83 (2006) [10.1149/1.2170585]

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Please use a persistent id in citations: http://hdl.handle.net/2128/2783 doi:10.1149/1.2170585

Abstract: 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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Appears in the scientific report 2006

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