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A Facile, One-Step Synthesis for Core-Shell Perovskite Materials via Molten Salt

机译：通过熔盐的核 - 壳钙钛矿材料的容纳，一步合成

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摘要

Core-shell La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-La0.8Sr0.2MnO3 (LSM) heterostructure crystalline materials have been synthesized in a simple, one-step feeding method via a KNO3 molten salt solvent. Two-phase perovskite composites can be synthesized in times as short as 10 minutes and is demonstrated for the first time in a molten salt. A combination of X-ray diffraction and S/TEM energy dispersive X-ray spectroscopy has been utilized to confirm the formation of an LSM shell on LSCF cores in all samples when adjusting dwell time, core size, weight ratio between core and shell precursors, and weight ratio of powder to salt. Specifically, decreasing the LSCF core size increases core-shell yield. Smaller cores introduce a greater density of facets on the crystal surface and provide more favorable sites for LSM heterogeneous nucleation. Decreasing the weight ratio of shell precursor to core decreases shell thickness, reduces the number of homogeneously nucleated LSM nanoparticles, and increases core-shell yield. Increasing the amount of salt relative to powder decreases supersaturation in the melt and results in less uniform, isolated shell deposition on the cores. Overall, the molten salt synthesis of core-shell perovskite oxides is investigated and demonstrated as an expeditious method to synthesize core-shell composites for energy applications.
机译：核壳La0。6Sr0。4Co0。2Fe0。8O3（LSCF）-La0。8Sr0。采用KNO3熔盐溶剂一步进料法合成了2MnO3（LSM）异质结晶体材料。两相钙钛矿复合材料可以在短短10分钟内合成，并首次在熔盐中得到证实。利用X射线衍射和S/TEM能量色散X射线光谱相结合的方法，在调整停留时间、芯尺寸、芯壳前驱体之间的重量比以及粉末与盐的重量比时，确认了所有样品中LSCF芯上LSM壳层的形成。具体而言，减小LSCF芯尺寸可提高核壳产量。较小的核在晶体表面引入更大密度的小平面，并为LSM异质成核提供更有利的位置。降低壳前驱体与核的重量比会降低壳厚度，减少均匀成核的LSM纳米颗粒的数量，并提高核壳产率。增加盐相对于粉末的含量会降低熔体中的过饱和度，并导致芯上不均匀、孤立的壳层沉积。总的来说，熔盐法合成核壳钙钛矿氧化物是一种快速合成核壳复合材料的方法。

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