TiO2(B) 纳米粒子的形貌,Journal of the American Chemical Society

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TiO2(B) 纳米粒子的形貌
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2015-10-14 , DOI: 10.1021/jacs.5b08434
Xiao Hua ₁ , Zheng Liu ₂ , Peter G. Bruce ₃ , Clare P. Grey ₁

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纳米材料的形态（几何形状和尺寸）对其物理和化学性质有重大影响。因此，必须确定纳米材料的形态，以便将形状与特定应用中的性能联系起来。在实践中，具有不同长度尺度的结构特征在材料的 X 射线或中子总散射模式的特定角度范围内进行编码。通过结合小角度和广角散射（通常是 X 射线）实验，可以覆盖整个角度范围，从而可以在介观和纳米尺度上准确确定结构。在本文中，锂离子电池负极材料 TiO2 (B) 纳米颗粒的综合形态分析（在 Ren, Y.；Liu, Z.；Pourpoint, F.；Armstrong, AR；Grey, CP；Bruce, PG 中描述） Angew. Chem. Int. 埃德。2012, 51, 2164)，介绍了将结构建模与小角度 X 射线散射 (SAXS)、对分布函数 (PDF) 和 X 射线粉末衍射 (XRPD) 技术相结合。颗粒呈扁圆形，沿 [010] 方向收缩，这种特殊的形态为这些 TiO2(B) 纳米颗粒的优异电化学行为提供了合理的理由，同时也为模拟由锂化。这项工作证明了在多个长度尺度上分析各种结构特征以确定纳米材料形态的重要性。颗粒呈扁圆形，沿 [010] 方向收缩，这种特殊的形态为这些 TiO2(B) 纳米颗粒的优异电化学行为提供了合理的理由，同时也为模拟由锂化。这项工作证明了在多个长度尺度上分析各种结构特征以确定纳米材料形态的重要性。颗粒呈扁圆形，沿 [010] 方向收缩，这种特殊的形态为这些 TiO2(B) 纳米颗粒的优异电化学行为提供了合理的理由，同时也为模拟由锂化。这项工作证明了在多个长度尺度上分析各种结构特征以确定纳米材料形态的重要性。

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The Morphology of TiO2(B) Nanoparticles

The morphology of a nanomaterial (geometric shape and dimension) has a significant impact on its physical and chemical properties. It is, therefore, essential to determine the morphology of nanomaterials so as to link shape with performance in specific applications. In practice, structural features with different length scales are encoded in a specific angular range of the X-ray or neutron total scattering pattern of the material. By combining small- and wide-angle scattering (typically X-ray) experiments, the full angular range can be covered, allowing structure to be determined accurately at both the meso- and the nanoscale. In this Article, a comprehensive morphology analysis of lithium-ion battery anode material, TiO2 (B) nanoparticles (described in Ren, Y.; Liu, Z.; Pourpoint, F.; Armstrong, A. R.; Grey, C. P.; Bruce, P. G. Angew. Chem. Int. Ed. 2012, 51, 2164), incorporating structure modeling with small-angle X-ray scattering (SAXS), pair distribution function (PDF), and X-ray powder diffraction (XRPD) techniques, is presented. The particles are oblate-shaped, contracted along the [010] direction, this particular morphology providing a plausible rationale for the excellent electrochemical behavior of these TiO2(B) nanoparticles, while also provides a structural foundation to model the strain-driven distortion induced by lithiation. The work demonstrates the importance of analyzing various structure features at multiple length scales to determine the morphologies of nanomaterials.

更新日期：2015-10-14

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