Revealing the Atomic Structures of Exposed Lateral Surfaces for Polymorphic Manganese Dioxide Nanowires
Revealing the Atomic Structures of Exposed Lateral Surfaces for Polymorphic Manganese Dioxide Nanowires
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揭示多晶型二氧化锰纳米线暴露侧面的原子结构
DOI：
10.1002/sstr.202000091
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发表时间：
2020
期刊：
影响因子：
15.9
通讯作者：
Lu, Jun
中科院分区：
文献类型：
--
作者：
Yuan, Yifei;Yao, Wentao;Byles, Bryan W.;Pomerantseva, Ekaterina;Amine, Khalil;Shahbazian‐Yassar, Reza;Lu, Jun
多晶型一维MnO 2纳米结构在催化、传感、储能等领域有着广泛的应用，其功能主要取决于其侧面暴露的原子图案，目前尚不清楚。在此，通过直接沿着它们的轴向方向的高分辨率透射电子显微镜（HRTEM）成像，公开了多晶型MnO 2纳米线的最外侧面的原子结构。为了概括这些发现，我们针对四个最常见的具有特征隧道结构的阶段，即，β-、γ-、α-和钙锰矿（t）-MnO 2，其通常使用文献中报道的水热法合成。通过HRTEM对这些MnO 2纳米线进行轴向成像，覆盖侧表面的{hkl}面被精确地索引，每个{hkl}面的原子图案被揭示，并且它进一步与最外层的隧道配置耦合，该隧道配置可以通过隧道驱动的质量吸附/传输显著影响MnO 2材料的物理化学性质。这项工作提供了一个可靠的参考MnO 2的原子模型，以有利于追求其结构-性能关系，此外，它可以有利于表面工程策略，以更好地合理化的小面生长控制与优化的功能。
Polymorphic 1D MnO2nanostructures are widely applied in fields such as catalysis, sensing, and energy storage with the functionality mainly determined by the atomic patterns of their laterally exposed facets, which largely remain unclear so far. Herein, by high‐resolution transmission electron microscopy (HRTEM) imaging directly along their axial directions, the atomic structures of the outmost lateral facets of polymorphic MnO2nanowires are disclosed. To generalize the findings, four most commonly seen phases with characteristic tunnel structures are targeted, i.e., β‐, γ‐, α‐, and todorokite(t)‐MnO2, which are synthesized conventionally using a hydrothermal method reported in the literature. Axially imaging these MnO2nanowires via HRTEM, the {hkl} facets covering the lateral surfaces are accurately indexed, the atomic pattern of each {hkl} facet is revealed, and it is further coupled with the outmost tunnel configuration that can significantly affect the physicochemical property of MnO2materials via tunnel‐driven mass adsorption/transport. This work provides a reliable reference for atomic modeling of MnO2to benefit the pursuit of its structure–property relationship; in addition, it can benefit surface engineering strategies to better rationalize the facet growth control with optimized functionality.