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

Perovskite oxides, , have been investigated in the search for new solid oxide fuel cell (SOFC) anode materials. (LSTM4646) shows an electrical conductivity of in air and in wet Ar/4% at . It is thermally and chemically compatible with yttria-stabilized zirconia (YSZ) electrolytes. Three processes govern the electrochemical performance of LSTM4646/YSZ anodes in wet or wet . 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, , an electrolyte-supported /air fuel cell with an LSM/YSZ cathode yields a power density of at at . 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.