Abstract
Solid oxide electrolysis cell (SOEC) is regarded as one of the most promising hydrogen generation devices. However, electrolysis operated at high temperature has some problems; component inter-diffusion and difficulty in the selection of sealant etc.. SOEC (IT-SOEC) at intermediate temperature (550~650oC) may reduce problems, however, most of the overpotential occurs in air electrode. In this study, we have tested La2NiO4+δ (LNO) as an air electrode and compared the performance with that of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) which shows degradation due to Sr segregation. LNO has advantages due to its good thermal-expansion coefficient (TEC) match with electrolyte and little cation segregation. Electrochemical performance of SOEC at 650oC under electrolysis current shows that LNO is a promising as an air electrode.
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