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Growth of beta-Li2TiO3 Nanocrystals from LiCl and LiOH Fluxes

机译：来自LiCl和LiOH助熔剂的β-Li2TiO3纳米晶体的生长

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摘要

Lithium-titanium oxide (beta-Li2TiO3, LTO) crystals are a requisite precursor for hydrated titanium oxide [TiO(OH)(2) or H2TiO3, HTO], which is a promising lithiumion (Li+) sieve because of its high theoretical Lit-exchange capacity (LiEC) and unique crystal structure. Herein, we report the flux growth of LTO nanocrystals from LiCl and LiOH as a function of the holding temperature. The use of LiCl as a flux resulted in the growth of single-phase, monodispersed LTO nanocrystals at = 600 degrees C. On the other hand, using a LiOH flux led to the growth of single-phase LTO crystals at = 550 degrees C. The surface areas of the LTO samples grown from the LiCl and LiOH fluxes, LTOLiCl and LTOLiOH, respectively, reached their respective maxima of 17 and 29 m(2)g(-1), which are 2-4 times the value (7 m(2)g(-1)) obtained for the LTO synthesized via a solid-state reaction at 700 degrees C. The resulting LTO samples were then immersed in an acid to prepare the HTO samples as adsorbents for Lit Isotherms of Li+ adsorption on the HTO samples showed that the LiEC of the HTO prepared using the LiCl flux was similar to 30% higher than that of the HTO prepared from the sample synthesized via a solid-state reaction. In addition, kinetic curve experiments showed that the first-order reaction rate constants of the flux-grown HTO samples were 2-3 times that of the solid-state reaction HTO. This higher reaction rate can be attributed to the decrease in the length of the ion-exchange paths resulting from the reduced crystal sizes.
机译：锂 - 氧化钛（Beta-Li2TiO3，LTO）晶体是水合氧化钛的必要前体[TiO（OH）（2）或H2TiO3，HTO]，其是一种有前途的锂锂（Li +）筛，因为它的高理论亮度 - 交换能力（液晶）和独特的晶体结构。在此，作为保持温度的函数，我们将LTO纳米晶体的助熔剂生长报告。使用LiCl作为通量导致单相的生长，单相接放的LTO纳米晶体在另一方面，使用LiOH助焊剂导致单相LTO晶体的生长。= 550℃。分别从LiCl和LiOH助熔剂，LTOLICL和LTOLIOH生长的LTO样品的表面区域达到其各自的最大值为17和29m（2）G（-1），这是2-4倍通过在700℃下通过固态反应合成的LTO获得的值（7m（2）g（-1））。然后将所得的LTO样品浸入酸中以制备HTO样品作为升温的吸附剂Li +在HTO样品上的吸附表明，使用LICL通量制备的HTO的液体与通过固态反应合成的样品制备的HTO高于30％。此外，动力学曲线实验表明，助焊剂HTO样品的一级反应速率常数为固态反应HTO的2-3倍。这种更高的反应速率可归因​​于由降低的晶体尺寸产生的离子交换路径的长度的减小。

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  • 来源
    《Crystal growth & design》 |2019年第2期|共7页
  • 作者

    Hayashi Fumitaka; Ogawa Kazuya; Moriya Yosuke; Sudare Tomohito; Teshima Katsuya;

  • 作者单位

    Shinshu Univ Dept Mat Chem Fac Engn 4-17-1 Wakasato Nagano 3808553 Japan;

    Shinshu Univ Dept Environm Sci &

    Technol Fac Engn 4-17-1 Wakasato Nagano 3808553 Japan;

    Shinshu Univ Global Aqua Innovat Ctr 4-17-1 Wakasato Nagano 3808553 Japan;

    Shinshu Univ Ctr Energy &

    Environm Sci 4-17-1 Wakasato Nagano 3808553 Japan;

    Shinshu Univ Dept Mat Chem Fac Engn 4-17-1 Wakasato Nagano 3808553 Japan;

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  • 正文语种 eng
  • 中图分类 晶体学;
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