La0.6PrSr0.4NiO4-Ce0.8Pr0.2O2 composite cathode for solid oxide fuel cell

(1-xwt%) La0.6PrSr0.4NiO4 - (xwt%) Ce0.8Pr0.2O2 (x = 0, 10, 20, 30, 40, 50), abbreviated as LPSN-xCPO, were prepared and used as composite cathode for intermediate temperature solid oxide fuel cell (IT-SOFC). XRD result suggested that no chemical reaction occurred between LPSN and CPO after sintering at 1200 degrees C for 4 h. Electrical conductivity of LPSN-xCPO decreased with x. LPSN-40CPO exhibited the best performance on cathode impedance spectra under open-circuit condition. At 700 degrees C, Exchange current density of LPSN-40CPO and LPSN was 50.1 and 15.8 mA cm(-2), respectively, and the polarization resistance R-P of LPSN-40CPO was 0.22 Omega cm(2), which is about one-eighth of that of LPSN. The OCV of the cell with LPSN-40CPO as cathode was about 0.78 V, and the maximum of power density was about 88 mW cm(-2). LPSN-40CPO can be a promise candidate for cathode in IT-SOFC. (C) 2014 Elsevier B.V. All rights reserved.