Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, USA.
Nanoscale. 2018 Jun 7;10(22):10443-10449. doi: 10.1039/c8nr01400k.
Here we demonstrate the broad capability to exploit interactions at different length scales in 2D materials to prepare macroscopic functional materials containing hybrid black phosphorus/graphene (BP/G) heterostructured building blocks. First, heterostructured 2D building blocks are self-assembled during co-exfoliation in the solution phase based on electrostatic attraction of different 2D materials. Second, electrophoretic deposition is used as a tool to assemble these building blocks into macroscopic films containing these self-assembled 2D heterostructures. Characterization of deposits formed using this technique elucidates the presence of stacked and sandwiched 2D heterostructures, and zeta potential measurements confirm the mechanistic interactions driving this assembly. Building on the exceptional sodium alloying capacity of BP, these materials were demonstrated as superior binder-free and additive-free anodes for sodium batteries with specific discharge capacity of 2365 mA h gP-1 and long stable cycling duration. This study demonstrates how controllable co-processing of 2D materials can enable material control for stacking and building block assembly relevant to broad future applications of 2D materials.
在这里，我们展示了在二维材料中利用不同长度尺度的相互作用来制备包含混合黑磷/石墨烯 (BP/G) 异质结构块的宏观功能材料的广泛能力。首先，基于不同二维材料的静电吸引，在溶液相中进行共剥离时，自组装异质结构二维块体。其次，电泳沉积被用作将这些构建块组装成包含这些自组装二维异质结构的宏观薄膜的工具。使用该技术形成的沉积物的特性阐明了堆叠和夹置的二维异质结构的存在，而 ζ 电位测量证实了驱动这种组装的机械相互作用。基于 BP 的优异钠合金化能力，这些材料被证明是具有 2365 mA h gP-1 的比容量和长循环稳定性的出色无粘结剂和无添加剂的钠离子电池的负极材料。本研究展示了二维材料的可控共处理如何能够实现与二维材料的广泛未来应用相关的堆叠和构建块组装的材料控制。
