Hollow/Porous-Walled SnO₂ via Nanoscale Kirkendall Diffusion with Irregular Particles

Nanomaterials eJournal Pub Date : 2019-11-11 DOI:10.2139/ssrn.3485083

Bo-In Park, Jin-Sung Park, Seunggun Yu, So-Hye Cho, J. Oh, Seung Yong Lee

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Abstract

Hollow/porous structured SnO₂ nanoparticles were synthesized by simple oxidation of dense metal chalcogenide precursors via nanoscale Kirkendall diffusion effect. First, tin chalcogenide (SnS, SnSe) nanoparticles were synthesized by mechanochemical method, which is considered a facile, scalable, and eco-friendly process. Hollow/porous-walled SnO₂ nanoparticles were synthesized by simple oxidation of the prepared Sn chalcogenide precursors, for which the transformation mechanism was verified in detail. Nanoscale Kirkendall diffusion process was thoroughly investigated by morphological, crystallographic, and elemental analyses performed at various oxidation temperatures and times. To examine the morphological effect of hollow/porous-walled SnO₂ nanoparticles on the electrochemical performance, the synthesized nanoparticles were applied as anode material in a lithium-ion battery. Anode material showed highly improved electrochemical properties compared to its dense counterpart, with 83% capacity retention from the second cycle at the 400th cycle and discharge capacity of 302 mA h g⁻¹ at a high current density of 30 A g⁻¹.

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不规则粒子的纳米Kirkendall扩散研究

利用纳米级Kirkendall扩散效应，对致密金属硫族化合物前驱体进行简单氧化，合成了中空/多孔结构的SnO 2纳米颗粒。首先，采用机械化学方法合成硫系锡纳米颗粒(SnS, SnSe)，该方法被认为是一种简单、可扩展和环保的工艺。对制备的硫系锡前驱体进行简单氧化，合成了中空/多孔纳米SnO 2，并对其转化机理进行了详细验证。在不同的氧化温度和时间下，通过形态学、晶体学和元素分析对纳米级Kirkendall扩散过程进行了彻底的研究。为了考察中空/多孔纳米颗粒形貌对电化学性能的影响，将合成的纳米颗粒作为负极材料应用于锂离子电池中。与致密材料相比，阳极材料的电化学性能得到了很大的改善，在第400次循环时，第二次循环的容量保留了83%，在30a g⁻¹的高电流密度下，放电容量为302 mA h。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nanomaterials eJournal

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