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首页> 外文期刊>Advanced Functional Materials >Reduced Surfactant Uptake in Three Dimensional Assemblies of VO_X Nanotubes Improves Reversible Li~+ Intercalation and Charge Capacity
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Reduced Surfactant Uptake in Three Dimensional Assemblies of VO_X Nanotubes Improves Reversible Li~+ Intercalation and Charge Capacity

机译：减少VO_X纳米管三维组件中表面活性剂的摄取，改善了可逆的Li〜+嵌入和电荷容量

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The relationship between the nanoscale structure of vanadium pentoxide nanotubes and their ability to accommodate Li~+ during intercalation/ deintercalation is explored. The nanotubes are synthesized using two different precursors through a surfactant-assisted templating method, resulting in standalone VO_x (vanadium oxide) nanotubes and also "nano-urchin". Under highly reducing conditions, where the interlaminar uptake of primary alkylamines is maximized, standalone nanotubes exhibit near-perfect scrolled layers and long-range structural order even at the molecular level. Under less reducing conditions, the degree of amine uptake is reduced due to a lower density of V~(4+) sites and less V_2O_5 is functionalized with adsorbed alkylammonium cations. This is typical of the nano-urchin structure. High-resolution TEM studies revealed the unique observation of nanometer-scale nanocrystals of pristine unreacted V_2O_5 throughout the length of the nanotubes in the nano-urchin. Electrochemical intercalation studies revealed that the very well ordered xerogel-based nanotubes exhibit similar specific capacities (235 mA h g~(-1)) to Na~+-exchange nanorolls of VO_X (200 mA h g~(-1)). By comparison, the theoretical maximum value is reported to be 240 mA h g~(-1) The VOTPP-based nanotubes of the nano-urchin 3D assemblies, however, exhibit useful charge capacities exceeding 437 mA h g~(-1), which is a considerable advance for VO_x based nanomaterials and one of the highest known capacities for Li~+ intercalated laminar vanadates.
机译：探索了五氧化二钒纳米管的纳米结构与其在嵌入/脱嵌过程中适应Li〜+的能力之间的关系。通过表面活性剂辅助模板法，使用两种不同的前体合成纳米管，从而产生独立的VO_x（钒氧化物）纳米管，也产生了“纳米海胆”。在高度还原的条件下，最大程度地提高了伯烷基胺的层间吸收能力，即使在分子水平上，独立的纳米管也显示出近乎完美的滚动层和长距离结构顺序。在较少的还原条件下，由于较低的V〜（4+）位密度而减少了胺的吸收程度，并且较少的V_2O_5被吸附的烷基铵阳离子官能化。这是纳米顽童结构的典型特征。高分辨率TEM研究揭示了在纳米顽童中整个纳米管长度上未反应的原始V_2O_5纳米级纳米晶体的独特观察。电化学插入研究表明，非常有序的基于干凝胶的纳米管表现出与VO_X的Na +交换纳米卷（200 mA h g〜（-1））相似的比容量（235 mA h g〜（-1））。相比之下，理论最大值据报道为240 mA hg〜（-1），纳米顽固3D组件的基于VOTPP的纳米管显示出超过437 mA hg〜（-1）的有用电荷容量。基于VO_x的纳米材料取得了相当大的进步，并且是Li〜+嵌入层状钒酸盐的已知能力之一。

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  • 来源
    《Advanced Functional Materials》 |2009年第11期|1736-1745|共10页
  • 作者

    Colm ODwyer; Vladimir Lavayen; David A. Tanner; Simon B. Newcomb; Eglantina Benavente; Cuillermo Gonzalez; Clivia M. Sotomayor Torres;

  • 作者单位

    Department of Physics, University of Limerick Limerick (Ireland) Materials &. Surface Science Institute, University of Limerick Limerick (Ireland);

    Departamento de Fisica, Universidad Tecnica Federico Santa Maria Avenida Espana 1680, 2390123 Valparaiso (Chile) Area de Ciencias Naturais e Tecnologicas, Centra Universitario Franciscano 97010-032, Santa Maria - RS (Brazil);

    Materials &. Surface Science Institute, University of Limerick Limerick (Ireland) Department of Manufacturing and Operations Engineering University of Limerick Limerick (Ireland);

    Glebe Scientific Limited Newport, Co. Tipperary (Ireland);

    Department of Chemistry, Universidad Tecnologica Metropolitana Av. Jose Pedro Alessandri, Santiago (Chile);

    Department of Chemistry, Universidad de Chile P. O. Box 653, Santiago (Chile);

    Institute for Research and Advanced Studies, ICREA 08010 Barcelona (Spain) Catalan Institute of Nanotechnology Edifici CM7, Campus Universitat Autonoma de Barcelona, 08193 Bellaterra (Spain);

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