Formation and Characterization of Hydrogen Boride Sheets Derived from MgB2 by Cation Exchange,Journal of the American Chemical Society

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Formation and Characterization of Hydrogen Boride Sheets Derived from MgB2 by Cation Exchange
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-09-19 , DOI: 10.1021/jacs.7b06153
Hiroaki Nishino , Takeshi Fujita ₁ , Nguyen Thanh Cuong ₂ , Satoshi Tominaka ₃ , Masahiro Miyauchi ₄ , Soshi Iimura ₅ , Akihiko Hirata _{1,

6} , Naoto Umezawa ₃ , Susumu Okada , Eiji Nishibori ₇ , Asahi Fujino , Tomohiro Fujimori , Shin-ichi Ito , Junji Nakamura ₇ , Hideo Hosono _{5,

8} , Takahiro Kondo _{7,

8}

Affiliation

Two-dimensional (2D) materials are promising for applications in a wide range of fields because of their unique properties. Hydrogen boride sheets, a new 2D material recently predicted from theory, exhibit intriguing electronic and mechanical properties as well as hydrogen storage capacity. Here, we report the experimental realization of 2D hydrogen boride sheets with an empirical formula of H1B1, produced by exfoliation and complete ion-exchange between protons and magnesium cations in magnesium diboride (MgB2) with an average yield of 42.3% at room temperature. The sheets feature an sp2-bonded boron planar structure without any long-range order. A hexagonal boron network with bridge hydrogens is suggested as the possible local structure, where the absence of long-range order was ascribed to the presence of three different anisotropic domains originating from the 2-fold symmetry of the hydrogen positions against the 6-fold symmetry of the boron networks, based on X-ray diffraction, X-ray atomic pair distribution functions, electron diffraction, transmission electron microscopy, photo absorption, core-level binding energy data, infrared absorption, electron energy loss spectroscopy, and density functional theory calculations. The established cation-exchange method for metal diboride opens new avenues for the mass production of several types of boron-based 2D materials by countercation selection and functionalization.

中文翻译：

通过阳离子交换从 MgB2 衍生的硼化氢片的形成和表征

二维 (2D) 材料因其独特的特性而有望在广泛的领域中应用。硼化氢片是最近从理论预测的一种新的二维材料，表现出有趣的电子和机械性能以及储氢能力。在这里，我们报告了具有经验式 H1B1 的 2D 硼化氢片的实验实现，通过剥离和二硼化镁 (MgB2) 中质子和镁阳离子之间的完全离子交换产生，室温下平均产率为 42.3%。这些片材具有 sp2 键合的硼平面结构，没有任何长程有序。具有桥氢的六边形硼网络被建议作为可能的局部结构，其中长程有序的缺失归因于三个不同的各向异性域的存在，这些域源自氢位置的 2 倍对称性与硼网络的 6 倍对称性，基于 X 射线衍射，X 射线原子对分布函数、电子衍射、透射电子显微镜、光吸收、核心级结合能数据、红外吸收、电子能量损失光谱和密度泛函理论计算。已建立的金属二硼化物阳离子交换方法为通过抗衡阳离子选择和功能化批量生产多种类型的硼基二维材料开辟了新途径。X 射线原子对分布函数、电子衍射、透射电子显微镜、光吸收、核心级结合能数据、红外吸收、电子能量损失光谱和密度泛函理论计算。已建立的金属二硼化物阳离子交换方法为通过抗衡阳离子选择和功能化批量生产多种类型的硼基二维材料开辟了新途径。X 射线原子对分布函数、电子衍射、透射电子显微镜、光吸收、核心级结合能数据、红外吸收、电子能量损失光谱和密度泛函理论计算。已建立的金属二硼化物阳离子交换方法为通过抗衡阳离子选择和功能化批量生产多种类型的硼基二维材料开辟了新途径。

更新日期：2017-09-19

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