Development of Intermediate Temperature Planar Solid Oxide Fuel Cells. AnnualReport, September 1992-1993

摘要

Dense, uniform thin films (0.5 - 0.2 micrometer) of LSCF, YSZ and LSM weredeposited on dense or porous substrates at temperatures not exceeding 600 C. Cathode/electrolyte interaction studies revealed the formation of reaction products at the interface. The presence of a CSO buffer layer eliminated the interactions and decreased the interfacial resistance appreciably. Both LSCF and YCF systems have been evaluated and are considered potential cathode materials at reduced temperatures. They are chemically and structurally stable over a wide range of temperature and oxygen activity, they exhibit mixed conductivity and their thermal expansion coefficient can be made to match that of YSZ. Blocking electrode experiments revealed that the partial ionic conductivity of LSCF is comparable to that of YSZ. Single cells based on planar thin film design will be fabricated and tested.