In-depth study of the Ruddlesden-Popper La x Sr 2−x MnO 4±δ family as possible electrode materials for symmetrical SOFC
In-depth study of the Ruddlesden-Popper La x Sr 2−x MnO 4±δ family as possible electrode materials for symmetrical SOFC
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DOI：
10.1016/j.ijhydene.2017.07.062
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发表时间：
2017-08
影响因子：
7.2
通讯作者：
M. V. Sandoval;C. Pirovano;E. Capoen;Romain Jooris;F. Porcher;P. Roussel;G. Gauthier
中科院分区：
文献类型：
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作者：
M. V. Sandoval;C. Pirovano;E. Capoen;Romain Jooris;F. Porcher;P. Roussel;G. Gauthier
采用固相反应法在空气中合成了LaxSr 2 − xMnO 4 ±δ（0.25 ≤ x ≤ 0.6）锰氧化物。所有这些材料不仅在还原气氛中稳定，而且在氧化还原循环条件下，在有限的体积变化下，它们还保持具有I4/mmm对称性的K2 NiF 4型结构。x = 0.5的相通过原位高温中子粉末衍射（HTNPD）分析，在流动的氢气下，显示在还原过程中，在钙钛矿平面的赤道位置上形成氧离子空位。优化了总电导率，发现x = 0.5时最大，在800 °C空气和3%H2/Ar中分别为35.6 S cm− 1和1.9 S cm− 1，这被认为足以用于对称SOFC电极的活性层。第一电化学阻抗谱（EIS）测量在氧化和还原条件下，使用YSZ电解质和GDC缓冲层，提出引起有前途的价值。
The Ruddlesden Popper (RP) manganites LaxSr2−xMnO4±δwith compositions 0.25 ≤ x ≤ 0.6 have been successfully synthesized as single phases by solid-state reaction in air. All those materials are not only stable in reducing atmosphere but they also maintain the K2NiF4-type structure withI4/mmmsymmetry under redox cycling conditions with limited volume changes. The x = 0.5 phase was analyzed byin situhigh temperature neutron powder diffraction (HTNPD), under flowing hydrogen, showing the formation of oxide-ion vacancies on the equatorial sites of the perovskite planes, during reduction process. The total electrical conductivity was optimized and found maximum for x = 0.5 with values of 35.6 S cm−1and 1.9 S cm−1at 800 °C in air and 3% H2/Ar, respectively, what is judged to be sufficient for an active layer of symmetrical SOFC electrode. First Electrochemical Impedance Spectroscopy (EIS) measurements in both oxidizing and reducing conditions, using an YSZ electrolyte and a GDC buffer layer, are presented giving rise to promising values.