Cho Jung Sang, Hong Young Jun, Lee Jong-Heun, Kang Yun Chan
Department of Materials Science and Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
Nanoscale. 2015 May 14;7(18):8361-7. doi: 10.1039/c5nr01391g.
A novel structure denoted a "hollow nanosphere aggregate" is synthesized by introducing nanoscale Kirkendall diffusion to the spray pyrolysis process. The hollow Fe2O3 nanosphere aggregates with spherical shape and micron size are synthesized as the first target material. A solid iron oxide-carbon composite powder that is prepared by a one-pot spray pyrolysis process is transformed into the hollow Fe2O3 nanosphere aggregates by sequential post-pyrolysis treatments under reducing and oxidizing atmospheres. The nanoscale Kirkendall diffusion plays a key role in the formation of the hollow Fe2O3 nanosphere aggregates with spherical shape and micron size. The unique structure of the hollow Fe2O3 nanosphere aggregates results in their superior electrochemical properties as an anode material for lithium ion batteries by improving the structural stability during cycling. The hollow metal oxide nanosphere aggregates with various compositions for wide applications including energy storage can be prepared by the simple fabrication method introduced in this study.
通过将纳米级柯肯达尔扩散引入喷雾热解过程，合成了一种新型结构，即“中空纳米球聚集体”。作为首个目标材料，合成了具有球形和微米尺寸的中空Fe2O3纳米球聚集体。通过一锅法喷雾热解工艺制备的固体氧化铁-碳复合粉末，在还原和氧化气氛下经过连续的热解后处理，转变为中空Fe2O3纳米球聚集体。纳米级柯肯达尔扩散在具有球形和微米尺寸的中空Fe2O3纳米球聚集体的形成过程中起关键作用。中空Fe2O3纳米球聚集体的独特结构通过提高循环过程中的结构稳定性，使其作为锂离子电池负极材料具有优异的电化学性能。通过本研究中介绍的简单制备方法，可以制备具有各种组成的中空金属氧化物纳米球聚集体，用于包括能量存储在内的广泛应用。
