Synthesis and performance of Sr1.5LaxMnO4 as cathode materials for intermediate temperature solid oxide fuel cell |
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Authors: | Sun Li-PingLi Qiang Huo Li-HuaZhao Hui Zhang Guo-YingLin Nan Jean-Paul ViricelleChristophe Pijolat |
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Affiliation: | a Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, PR China b Ecole Nationale Supérieure des Mines, Centre SPIN, LPMG-URA CNRS 2021, Saint Etienne Cedex 2, France |
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Abstract: | 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. |
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Keywords: | Intermediate temperature solid oxide fuel cell (IT-SOFC) Cathode materials Sr1.5LaxMnO4 Electrode reaction |
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