固体電解質型燃料電池用空気側集電体の開発

概要

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An air side current collector(ASCC)for a solid oxide fuel cells(SOFC)was fabricated and evaluated. Thirty mass%YSZ-LSM, was selected as a candidate material for ASCC. Its electrical conductivity at 1000°C and its average thermal expansion coefficient between room temperature and 1000°C were 65 S・cm^<-1> and 10.9×10^<-6>K^<-1> respectively. The gas channel width of ASCC is very important factor, because the current collecting resistance depends on it strongly. A 1 cm^2 cell was operated with different current collecting length, which corresponded to the width of the gas channel. We made it clear that the current collecting resistance was very small when the channel width was ≨3mm. The SOFC short-stack was built with a 140 cm^2 cell and two ceramic gas separators. The separator was composed of MgO-MgAl_2O_4 separate plates, La(Sr)CrO_3 current passages and current collectors. The electric power generation test was carried out at 1000°C for 700 h. The cell attained the output power 36 W at the current 48 A. The voltage loss at the gas separator with a current 45 A was 68 mV, accordingly the electric resistance of the separator was 1.5 mΩ. The electric resistance did not change after a thermal cycle conducted between 1000°C and room temperature.
社団法人日本セラミックス協会の論文
1999-12-01