Synthesis and high temperature electrochemical properties of Co-doped Sr1.5La0.5MnO4

Yu-Hang Fan (1) , Li-Ping Sun (1) , Hui Zhao (1) , Li-Hua Huo (1) , Jean-Marc. Bassat (2) , Aline Rougier (2) , Sebastien Fourcade (2) , Jean-Claude Grenier (2)

1 KLFIMC - Key Laboratory of Functional Inorganic Material Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Sr1.5La0.5Mn1-xCoxO4 (SLMCOx) cathode materials for IT-SOFCs (intermediate temperature solid oxide fuel cells) were synthesized by EDTA-citric acid method and characterized by XRD, XPS and EIS, respectively. The results show that SLMCOx has no reaction with Ce0.9Gd0.1O1.95 at 1 200℃ for 12 h. Both the amount of Mn3+ and Co2+ in the oxide increase with the Co doping concentration; at the same time the content of lattice oxygen reduces, and the distortion ratio (c/a) of the lattice increases. The EIS results show that Co-doping dramatically reduces the polarization resistance (Rp) of SLMCOx cathode. The Sr1.5La0.5Mn0.7Co0.3O4 has the lowest Rp of 0.62 Ω·cm2 at 700℃ in air, which is clearly smaller than the Rp value of Sr1.5La0.5Mn0.7O4 that measured at 750℃ (1.5 Ω·cm2). Our results indicate that the Co doped Sr1.5La0.5Mn1-xCoxO4 is potential cathode material for IT-SOFC.

Mots clés: Intermediate temperature solid oxide; Fuel cells; IT-SOFCs; Cathode materials

Domaines: Matériaux

Yu-Hang Fan, Li-Ping Sun, Hui Zhao, Li-Hua Huo, Jean-Marc. Bassat, et al.. Synthesis and high temperature electrochemical properties of Co-doped Sr1.5La0.5MnO4. Chinese Journal of Inorganic Chemistry, 2016, 32 (10), pp.1730-1738. ⟨10.11862/CJIC.2016.207⟩. ⟨hal-01432584⟩