Yusuke YAMADA

Electric conductivity and phase stability of La(Ni,Fe)O3 cathode for solid oxide fuel cell

Kazunori SATO

The LaNi(Fe)O3 (LNF) cathode combined with a 10 mol%Sc2O3-1 mol%Al2O3-89 mol%ZrO2 (SSAZ) electrolyte showed a higher solid oxide fuel cell (SOFC) performance than the conventional La(Sr)MnO3 cathode, using oxygen as the oxidant and hydrogen as the fuel. It follows, LNF is one of the promising cathode materials for intermediate temperature solid oxide fuel cells. Until now, there are few examples of a report as a SOFC cathode of LNF, and the influence the state of LNF phase under a operating condition affects a cell performance is not clear. In this research, J-V characteristic, cthodic overvoltage measurement by the DC current intercepting method, and interface resistance measurement by the AC impedance method were performed for examine the performance of the LNF cathode. LNF cathode showed the lower overvoltage than LNF cathode due to the high oxide ion diffusivity and the high surface-exchange reaction rate.