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Topochemical Deintercalation of Li from Layered LiNiB: toward 2D MBene

机译:从分层LINIB中的李大妙地脱羊皮:朝2D MBENE

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摘要

The pursuit of two-dimensional (2D) borides, MBenes, has proven to be challenging, not the least because of the lack of a suitable precursor prone to the deintercalation. Here, we studied room-temperature topochemical deintercalation of lithium from the layered polymorphs of the LiNiB compound with a considerable amount of Li stored in between [NiB] layers (33 at. % Li). Deintercalation of Li leads to novel metastable borides (Li_(~0.5)NiB) with unique crystal structures. Partial removal of Li is accomplished by exposing the parent phases to air, water, or dilute HC1 under ambient conditions. Scanning transmission electron microscopy and solid-state ~7Li and ~(11)B NMR spectroscopy, combined with X-ray pair distribution function (PDF) analysis and DFT calculations, were utilized to elucidate the novel structures of Li_(~0.5)NiB and the mechanism of Li-deintercalation. We have shown that the deintercalation of Li proceeds via a "zip-lock" mechanism, leading to the condensation of single [NiB] layers into double or triple layers bound via covalent bonds, resulting in structural fragments with Li[NiB]_2 and Li[NiB]_3 compositions. The crystal structure of Li_(~0.5)NiB is best described as an intergrowth of the ordered single [NiB], double [NiB]_2, or triple [NiB]_3 layers alternating with single Li layers; this explains its structural complexity. The formation of double or triple [NiB] layers induces a change in the magnetic behavior from temperature-independent paramagnets in the parent LiNiB compounds to the spin-glassiness in the deintercalated Li_(~0.5)NiB counterparts. LiNiB compounds showcase the potential to access a plethora of unique materials, including 2D MBenes (NiB).
机译:追求二维(2D)硼化物,MBENES,已被证明是挑战,并非最不缺乏合适的前体易于疏液。在此,我们研究了从LINIB化合物的层状多晶型物的室温TOPEMICICE脱嵌,具有相当大量的LI储存在[NIB]层(33.%LI)之间。 LI的蜕膜导致新的亚稳硼化物(Li_(〜0.5),具有独特的晶体结构。通过在环境条件下将亲子相暴露于空气,水或稀释的HCl来实现Li的部分去除。扫描透射电子显微镜和固态〜7LI和〜(11)B NMR光谱,结合X射线对分布函数(PDF)分析和DFT计算,阐明了Li_(〜0.5)尖端的新颖结构和Li-Deatercalation的机制。我们已经表明,LI的蜕膜通过“拉链锁”机制进行,导致单个[NIB]层的冷凝成通过共价键结合到双层或三层,导致具有Li [NIB] _2和LI的结构片段[nib] _3组成。 Li_(〜0.5)Nib的晶体结构最好被描述为有序单个[nib],双[nib] _2或三重[nib] _3层与单个LI层交替的晶间;这解释了它的结构性复杂性。双或三倍层的形成将母线在母线化合物中的温度无关的Paramagnets中的磁性行为的变化导致疏渗透的Li_(〜0.5)NIB对应物中的旋转玻璃结构。 Linib化合物展示了进入多种独特材料的潜力,包括2D Mbenes(NIB)。

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  • 来源
    《Journal of the American Chemical Society》 |2021年第11期|4213-4223|共11页
  • 作者单位

    Department of Chemistry Iowa State University Ames Iowa 50011 United States;

    Department of Chemistry Iowa State University Ames Iowa 50011 United States;

    EMAT Department of Physics University of Antwerp Antwerp 2020 Belgium;

    Argonne National Laboratory Lemont Illinois 60439 United States;

    Department of Applied Physics and Applied Mathematics Columbia University New York 10027 United States;

    Ames Laboratory US DOE Iowa State University Ames Iowa 50011 United States Department of Physics University of Science and Technology of China Hefei 230026 China;

    Department of Physics Yantai University Yantai 264005 China;

    Department of Chemistry and Ames Laboratory US DOE Iowa State University Ames Iowa 50011 United States;

    Department of Chemistry and Ames Laboratory US DOE Iowa State University Ames Iowa 50011 United States;

    Department of Physics and Astronomy Iowa State University Ames Iowa 50011 United States;

    Ames Laboratory US DOE and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 United States;

    Ames Laboratory US DOE and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 United States;

    Department of Chemistry and Ames Laboratory US DOE Iowa State University Ames Iowa 50011 United States;

    Department of Chemistry and Ames Laboratory US DOE Iowa State University Ames Iowa 50011 United States;

    Ames Laboratory US DOE and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 United States;

    Department of Physics and Astronomy Iowa State University Ames Iowa 50011 United States;

    EMAT Department of Physics University of Antwerp Antwerp 2020 Belgium;

    Department of Chemistry Iowa State University Ames Iowa 50011 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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