Abstract
Abstract Pr 2 NiO 4 is one of the compounds in the Ln 2 NiO 4 (Ln=Pr, La and Nd) group that exhibits the Ruddlesden-Poppor structure. The present research substituted this compound by lanthanum (La) to enhance chemical stability, because of the decomposition reaction of Pr 2 NiO 4 for long-term operation. PrLaNiO 4 powders were then synthesized using a solid state reaction method for the application of cathode materials in an intermediate-temperature solid oxide fuel cell (IT-SOFC); these material properties were then examined by XRD, SEM, thermomechanical analysis, alternating current impedance spectroscopy, and electrochemical analysis. The crystallization of the as-prepared PrLaNiO4 was obtained after heat-treatment at 1200 °C for 6 h. Moreover, PrLaNiO 4 cathode material demonstrated favorable chemical stability with the electrolyte of (La 0.75 Sr 0.2 Ba 0.05 ) 0.175 Ce 0.825 O 1.891 (LSBC) under 1200 °C for 6 h. The determined thermal expansion coefficient of PrLaNiO 4 was 14.1 × 10 −6 K −1 . Furthermore, to reduce their resistance the PrLaNiO 4 powders were mixed with various wt% of LSBC. The maximal power density of PrLaNiO 4 −5 wt% LSBC is 606 mW/cm 2 operated at 800 °C in air, which also exhibited lower area-specific resistance of 0.202 Ω cm 2 . The study concludes that the PrLaNiO 4 −5 wt% LSBC is a better choice than Pr 2 NiO 4 in cathode material for IT-SOFCs.
Published Version
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