Fabrication of three-dimensionally nanostructured carbon materials with functional tube-in-tube network units for enhanced electrochemical performances
Fabrication of three-dimensionally nanostructured carbon materials with functional tube-in-tube network units for enhanced electrochemical performances
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具有功能性管中管网络单元的三维纳米结构碳材料的制备以增强电化学性能
DOI：
10.1016/j.carbon.2019.05.039
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发表时间：
2019-10
期刊：
影响因子：
10.9
通讯作者：
Fu Ruowen
中科院分区：
文献类型：
--
作者：
Chen Luyi;Zheng Bingna;Huang Junlong;Tang Zhiwei;Liu Shaohong;Liu Ruliang;Wu Dingcai;Fu Ruowen
采用表面引发原子转移自由基聚合（SI-ATRP）技术，通过对三元瓶刷的结构设计和精确控制，制备了一种具有管中管结构的三维纳米碳材料（3DNCM）。3DNCM的3D互连网络由具有源自三元瓶刷的独特管中管结构的混合碳框架和由超交联聚苯乙烯（PS）碳化产生的微孔碳壳组成。通过控制三元瓶刷结构可以精确改变3DNCM的纳米结构。管中管结构为3DNCM提供了丰富的外无定形碳管内的小孢子和大量的中孔，这有利于硫元素的托管。此外，碳纳米管，管中管结构的核心，提供了具有优异的导电性的3DCNMs。考虑到管中管结构的突出优点，基于3DNCMs主体的硫阴极在2C电流密度下200次循环后显示出显著的倍率性能和691 mAh g-1的可逆放电容量。我们希望这种新颖的设计和构造明确的纳米结构的概念将为高性能纳米多孔碳材料的储能和其他实际应用铺平道路。
A kind of three-dimensionally nanostructured carbon materials (3DNCMs) with tube-in-tube structure was fabricated based on a novel structural design and precise control of ternary bottlebrushes by surface-initiated atom transfer radical polymerization (SI-ATRP). The 3D interconnected network of 3DNCMs consists of the hybrid carbon framework with unique tube-in-tube structure rooting from the ternary bottlebrushes and the microporous carbon shell generated from the carbonization of hypercrosslinked polystyrene (PS). The nanostructure of 3DNCMs can be changed precisely by controlling the ternary bottlebrush structures. The tube-in-tube structure provides 3DNCMs an abundant of microspores within outer amorphous carbon tube and a lot of mesopores from the removal of coated silica, which favor for the hosting of sulfur element. Moreover, carbon nanotubes, the core of the tube-in-tube structure, afford the 3DCNMs with excellent electrical conductivity. In view of the prominent advantages of the tube-in-tube structure, the sulfur cathode based on 3DNCMs hosts shows a remarkable rate capability and reversible discharge capacity of 691 mAh g−1after 200 cycles at a 2 C current density. We hope this concept of novel design and construction of well-defined nanostructure will pave the way toward high-performance nanoporous carbon materials for energy storage and other practical applications.
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