Abstract
Ni–Sn porous alloys with different concentrations of Sn were prepared as potential current collectors in solid oxide fuel cells (SOFCs). The weight increase of these species was evaluated after heat-treatment under elevated temperatures in air for thousands of hours to evaluate the long-term oxidation resistance. For the porous metal with 10 wt% of Sn, the electrical resistivity at 600°C was almost constant at approximately 0.02 Ω cm2 up to an elapsed time of 1000 h. In addition, the gas diffusibility and the current-collecting ability of the porous metal were equivalent to those of a platinum mesh when applied in the cathode current collector of a SOFC operated at 600°C. Ni–Sn porous alloys with adequate contents of Sn are believed to be promising cathode current collector materials in SOFCs for operation at temperatures below 600°C.
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