부산대학교 도서관

As a potential cathode material, the La.sub.1.5 - .sub.xEu.sub.xPr.sub.0.5Ni.sub.0.9Cu.sub.0.1O.sub.4 + [delta] (LEPNC-x, x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, and 0.8) oxide is synthesized and studied. A pure Ruddlesden-Popper (R-P) type K.sub.2NiF.sub.4 structure can only be obtained for x = 0.4 and lower. The thermal expansion coefficient (TEC) of Eu-doped LEPNC-x stays almost constant with temperature, and decreases with increasing x. The optimal electrochemical performance of NiO-BZCY|BZCY|LEPNC-x single cells can be achieved for x = 0.2, although the corresponding electrical conductivity is the lowest. The result of electrochemical impedance spectra (EIS) also confirms this conclusion. EIS analysis suggests that the pre-exponential factor and activation energy of polarization resistance should be mainly determined by the electrical conductivity and oxygen ion diffusion of cathode material, respectively.
Author(s): C. H. Wu [sup.1], Y. J. Shi [sup.1], F. Lu [sup.1], X. S. Jia [sup.1], J. R. Su [sup.1], H. He [sup.1], B. Cai [sup.1] Author Affiliations: (1) grid.207374.5, [...]