Han Xiguang, Han Xiao, Zhan Wenwen, Li Rong, Wang Fan, Xie Zhaoxiong
Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Department of Chemistry, School of Chemistry and Chemical Engineering, Jiangsu Normal University Xuzhou 221116 P. R. China
State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
RSC Adv. 2018 Jan 16;8(6):3218-3224. doi: 10.1039/c7ra11701a. eCollection 2018 Jan 12.
Three-dimensional hierarchical CoO microspheres assembled by well-aligned 1D porous nanorods have been synthesized by hydrothermal methods with the help of CTAB and subsequent heat treatment. The morphology and compositional characteristics of the hierarchical CoO microspheres have been investigated using different techniques. Based on the SEM and TEM analyses, the growth direction of the nanorods is in the [110] direction. The hierarchical CoO microspheres have a comparatively large Brunauer-Emmett-Teller surface area of about 50.2 mg, and pore size distribution is mainly concentrated at 12 nm. On the basis of the time tracking experiment, a possible growth mechanism has been proposed. It demonstrates that the overall mechanism includes nucleation, oriented growth and self-assembly processes. These hierarchical CoO microspheres provide several favorable features for Li-ion battery applications: (1) large Brunauer-Emmett-Teller surface area, (2) porous structure, and (3) hierarchical structure. Therefore, measurement of the electrochemical properties indicates that the specific capacity can maintain a stable value of about 1942 mA h g at a current of 100 mA g within 100 cycles.
通过水热法，借助十六烷基三甲基溴化铵（CTAB）并经过后续热处理，合成了由排列整齐的一维多孔纳米棒组装而成的三维分级结构CoO微球。已使用不同技术研究了分级结构CoO微球的形态和组成特征。基于扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析，纳米棒的生长方向为[110]方向。分级结构CoO微球具有约50.2 m²/g的相对较大的比表面积，孔径分布主要集中在12 nm。基于时间跟踪实验，提出了一种可能的生长机制。结果表明，整体机制包括成核、定向生长和自组装过程。这些分级结构CoO微球为锂离子电池应用提供了几个有利特性：（1）较大的比表面积；（2）多孔结构；（3）分级结构。因此，电化学性能测试表明，在100 mA/g的电流下，100个循环内比容量可保持在约1942 mA h/g的稳定值。
