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首页> 外文会议>Proceedings vol.2005-07; International Symposium on Solid Oxide Fuel Cells IX(SOFC-IX) vol.2: Materials; 20050515-20; Quebec City(CA) >PRELIMINARY INVESTIGATION OF THE HIGHER-ORDER RUDDLESDEN-POPPER PHASES FOR IT-SOFC CATHODES, La_(n+1)Ni_nO_(3n+1) (n = 2 and 3)
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PRELIMINARY INVESTIGATION OF THE HIGHER-ORDER RUDDLESDEN-POPPER PHASES FOR IT-SOFC CATHODES, La_(n+1)Ni_nO_(3n+1) (n = 2 and 3)

机译：IT_SOFC阴极La_（n + 1）Ni_nO_（3n + 1）（n = 2和3）的高阶Ruderlesden-Popper相的初步研究

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摘要

The Ruddlesden-Popper phase, La_2NiO_(4+δ), has generated much interest as an alternative cathode material to the conventionally used perovskite-based materials, La_(1-x)Sr_xBO_3 (B = Mn, Co), particularly in the intermediate temperature range (873-1073 K). This is largely due to a combination of good electrical conductivity with high oxide-ion diffusion coefficients in this temperature range. In a previous study, however, the degradation of La_2NiO_(4+δ) into a mixed Ni~(2+)/Ni~(3+) impurity phase was reported when subjected to prolonged heating at 1173 K for two weeks. This has been attributed to the favourable stability of the Ni~(3+) ion at lower temperatures (T < 1273 K) compared to the predominant Ni~(2+) present in this phase. We report here the results of an investigative study of the higher-order, mixed Ni~(2+)/Ni~(3+) Ruddlesden-Popper phases La_(n+1)Ni_nO_(3n+1) (n = 2 and 3) for possible use as cathodes in intermediate temperature solid oxide fuel cells. Details regarding the preparation and subsequent characterization of the La_(n+1)Ni_nO_(3n+1)(n = 2 and 3) phases by x-ray diffraction, oxygen content determination, electrical conductivity, thermal stability and area specific resistance measurements on symmetrical LSGM cells are presented.
机译：Ruddlesden-Popper相La_2NiO_（4 +δ）作为传统的钙钛矿基材料La_（1-x）Sr_xBO_3（B = Mn，Co）的替代阴极材料引起了人们的极大兴趣，特别是在中间温度范围（873-1073 K）。这主要是由于在此温度范围内良好的电导率与高氧化物离子扩散系数的结合。然而，在先前的研究中，据报道，当在1173 K下长时间加热两周时，La_2NiO_（4 +δ）降解为混合的Ni〜（2 +）/ Ni〜（3+）杂质相。这归因于与该相中主要的Ni〜（2+）相比，Ni〜（3+）离子在较低的温度（T <1273 K）下具有良好的稳定性。我们在这里报告对高阶混合Ni〜（2 +）/ Ni〜（3+）Ruddlesden-Popper相La_（n + 1）Ni_nO_（3n + 1）（n = 2和3）可用作中温固体氧化物燃料电池的阴极。有关La_（n + 1）Ni_nO_（3n + 1）（n = 2和3）相的制备和后续表征的详细信息，包括X射线衍射，氧含量测定，电导率，热稳定性和面积比电阻测量对称的LSGM细胞被提出。

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