Synthesis and performance of Sr1.5LaxMnO4 as cathode materials for intermediate temperature solid oxide fuel cell

Sun Li-Ping (1) , Qiang Li (1) , Zhao Hui (1) , Zhang Guo-Ying (1) , Lin Nan (1) , Jean-Paul Viricelle (2, 3, 4) , Christophe Pijolat (2, 3, 4)

1 KLFIMC - Key Laboratory of Functional Inorganic Material Chemistry
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires
4 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs

A-site non-stoichiometric materials Sr1.5LaxMnO4 (x = 0.35, 0.40, 0.45) are prepared via solid state reaction. The structure of these materials is determined to be tetragonal. Both the lattice volume and the thermal expansion coefficient reduce with the decrease of lanthanum content. On the contrary, the conductivity increases and the maximum value of 13.9 S cm−1 is found for Sr1.5La0.35MnO4 at 750 °C in air. AC impedance spectroscopy and DC polarization measurements are used to study the electrode performance. The optimum composition of Sr1.5La0.35MnO4 results in 0.25 Ω cm2 area specific resistance (ASR) at 750 °C in air. The oxygen partial pressure measurement indicates that the charge transfer process is the rate-limiting step of the electrode reactions.

Mots clés: Intermediate temperature solid oxide fuel cell (IT-SOFC); Cathode materials; Sr1.5LaxMnO4; Electrode reaction

Domaines: Génie des procédés

Sun Li-Ping, Qiang Li, Zhao Hui, Zhang Guo-Ying, Lin Nan, et al.. Synthesis and performance of Sr1.5LaxMnO4 as cathode materials for intermediate temperature solid oxide fuel cell. Journal of Power Sources, 2011, 196 (14), pp.5835-589. ⟨10.1016/j.jpowsour.2011.03.016⟩. ⟨hal-00596971⟩