Motoo TSUJI

Influence of the atmospheric oxygen pressure on the cathode performance of La(Ni,Fe)O3

Kazunori SATO

The La(Ni,Fe)O3 (LNF) cathode combined with a 10 mol%Sc2O3-1 mol%Al2O3-89 mol%ZrO2 (SASZ) electrolyte showed a higher solid oxide fuel cell (SOFC) performance than the conventional La(Sr)MnO3 cathode. LNF is one of the promising cathode materials for intermediate temperature SOFC. The LNF has not been sufficiently investigated so for, in the light of its phase stability. The electric conductivity of LNF was measured at different partial oxygen pressures by the 4 probe method. Although LNF showed a high electronic conductivity at the cell operating temperature under various oxygen pressures, an insufficient supply of oxygen to the reaction sites significantly increased the cathodic overvoltage.
The J-V characteristic and cathodic overvoltage measurements by the DC current interruption method were performed on order to examine the performance of the LNF cathode.

It has been shown that the LNF cathode performance is affected by the phase stability, which is determined by the supply of oxygen from the atmosphere.