Shinnosuke SASAKI

Enhancement of the atmospheric oxygen at the cathode performance of the lantern nickel iron oxide

Kazunori SATO

¡¡In this study, it aimed to development solid oxide type fuel cell (SOFC) of a possible low temperature operation. La(Ni0.6Fe0.4) O3-¦Ä (LNF) shows a high conductivity under the low temperature as a new cathode material. LNF shows the high electronic conductivity and the coefficient of thermal expansion close to the zirconia electrolyte, and the high electronic conductivity under the low temperature is higher than La0.8Sr0.2MnO3+¦Ä (LSM) of conventional cathode material. LNF is suitable for the cathode of SOFC. On the other hand, during running the SOFC, the reason of the instability of the SOFC performance on the low oxygen concentration is not clear. LNF showed that the phase decomposition and the conductivity decrease with decrease in the atmospheric oxygen concentration, and deterioration of the cathode performance with decrease the oxygen potential of the interface of cathode/electrolyte has been problem. The relation of LNF between the temperature and the cathode performance to the atmospheric oxygen concentration is clarified in this study, and the range that is able to be used with stability as SOFC cathode in the oxygen concentration was examined. Deterioration the cell performance with the lower atmosphere oxygen concentration is caused by the LNF crystalline phase destabilizing of interface, because the amount of the supply to the electrolyte of the oxide ion from the vapor oxygen was insufficient. However, the SOFC can be running with stability when the maintained supply of the vapor oxygen. LNF has the most important electronic conductivity in SOFC, and it showed the high performance that charge transfer reaction on the three-phase boundary is outstanding

Please use "previous botton" to return the previous page