Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian 350002, China.
Chemistry. 2012 Aug 20;18(34):10753-60. doi: 10.1002/chem.201200515. Epub 2012 Jul 16.
Unique ordered TiO(2) superstructures with tunable morphology and crystalline phase were successfully prepared by the use of different counterions. Dumbbell-shaped rutile TiO(2) and nanorod-like rutile mesocrystals constructed from ultrathin nanowires, and quasi-octahedral anatase TiO(2) mesocrystals built from tiny nanoparticle subunits were achieved. Interestingly, the obtained anatase mesocrystals have a fine microporous structure and a large surface area. The influence of the counterions in the reaction system is discussed and possible mechanisms responsible for the formation of the unique ordered TiO(2) superstructures with different morphologies and crystalline phases are also proposed based on a series of experimental results. The obtained TiO(2) superstructures were used as anode materials in lithium ion batteries, and exhibited higher capacity and improved rate performance; this is attributed to the intrinsic characteristics of the mesoscopic TiO(2) superstructures, which have a single-crystal-like and porous nature.
采用不同的抗衡离子成功制备了具有可调形态和晶相的独特有序 TiO(2) 超结构。得到了哑铃形锐钛矿 TiO(2) 和由超薄纳米线构建的纳米棒状锐钛矿微晶以及由微小纳米颗粒亚基构建的准八面体锐钛矿微晶。有趣的是，所得到的锐钛矿微晶具有精细的微孔结构和大的表面积。讨论了反应体系中抗衡离子的影响，并基于一系列实验结果提出了形成具有不同形态和晶相的独特有序 TiO(2) 超结构的可能机制。所得到的 TiO(2) 超结构被用作锂离子电池的阳极材料，表现出更高的容量和改善的倍率性能；这归因于介观 TiO(2) 超结构的固有特性，其具有单晶状和多孔性。
