2D Zn-Hexamine Coordination Frameworks and Their Derived N-Rich Porous Carbon Nanosheets for Ultrafast Sodium Storage
2D Zn-Hexamine Coordination Frameworks and Their Derived N-Rich Porous Carbon Nanosheets for Ultrafast Sodium Storage
复制标题
用于超快钠存储的二维锌六胺配位框架及其衍生的富氮多孔碳纳米片
DOI：
10.1002/aenm.201800569
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发表时间：
2018-08-06
影响因子：
27.8
通讯作者：
Song, Huaihe
中科院分区：
文献类型：
--
作者：
Liu, Sitong;Zhou, Jisheng;Song, Huaihe
金属有机配位框架作为制备各种纳米结构功能碳基材料的有效前体，已被广泛应用。然而，迄今为止，从单一配位框架设计2D碳纳米结构仍然是一个巨大的挑战。本文提出了一种从二维锌六胺配位骨架纳米片制备富氮多孔碳纳米片的有效策略。值得注意的是，碳纳米片的N掺杂水平可以达到16.54at%。此外，碳纳米片的厚度可以通过简单地调节起始材料的摩尔比来有效地调节。作为概念验证应用，所制备的碳纳米片作为钠离子电池的阳极材料，即使在10 A g（-1）下也表现出194 mAh g（-1）的超快钠存储能力。据了解，这种高倍率性能在以往的钠离子存储用碳质阳极材料的研究中很少得到。此外，该方法易于控制，并可扩展到大规模制备一系列二维N掺杂碳基纳米材料。
Metal-organic coordination frameworks have been widely used as efficient precursors for the preparation of functional carbon-based materials with various nanostructures. However, to date, the design of 2D carbon nanostructures from single coordination frameworks remains a great challenge. Herein, an efficient strategy for the fabrication of N-rich porous carbon nanosheets from 2D Zn-hexamine coordination framework nanosheets is developed. Remarkably, the N-doping level of carbon nanosheets can attain 16.54 at%. In addition, the thickness of the carbon nanosheets can effectively be tuned by simply adjusting the molar ratio of the starting materials. As a proof-of-concept application, the as-prepared carbon nanosheets as an anode material for sodium-ion batteries exhibit an ultrafast sodium storage capability of 194 mAh g(-1) even at 10 A g(-1). As far as it is known, such a high-rate capability has been rarely achieved in previous studies on carbonaceous anode materials for Na-ion storage. Moreover, this approach is readily controllable and could be extended to prepare a series of 2D N-doped carbon-based nanomaterials on a large scale.