Enhanced Electrical and Mechanical Properties of Chemically Cross-Linked Carbon-Nanotube-Based Fibers and Their Application in High-Performance Supercapacitors
Enhanced Electrical and Mechanical Properties of Chemically Cross-Linked Carbon-Nanotube-Based Fibers and Their Application in High-Performance Supercapacitors
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DOI：
10.1021/acsnano.9b07244
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发表时间：
2020-01-01
期刊：
影响因子：
17.1
通讯作者：
Lyding, Joseph W.
中科院分区：
文献类型：
--
作者：
Wang, Gang;Kim, Sung-Kon;Lyding, Joseph W.
由单壁碳纳米管 (CNT) 构成的纤维的导电性和机械强度通常受到各个 CNT 之间的弱相互作用的限制。在这项工作中，我们报告了通过单个碳纳米管的化学交联显着增强了这两种特性。 CNT纤维是通过湿法纺丝含有1,3,5-三(2'-溴苯基)苯(2TBB)分子作为交联剂的CNT溶液制成的，随后通过焦耳加热驱动交联。与 2TBB 交联可将 CNT 纤维的电导率提高约 100 倍，拉伸强度平均提高 47%；相比之下，在同样的焦耳加热过程后，没有2TBB制造的CNT纤维的拉伸强度下降。由2TBB处理的CNT纤维制成的对称超级电容器表现出非常高的体积能量密度（接近4.5 mWh cm(-3)）和功率密度（接近1.3 W cm(-3)）。
The electrical conductivity and mechanical strength of fibers constructed from single-walled carbon nanotubes (CNTs) are usually limited by the weak interactions between individual CNTs. In this work, we report a significant enhancement of both of these properties through chemical cross-linking of individual CNTs. The CNT fibers are made by wet-spinning a CNT solution that contains 1,3,5-tris(2'-bromophenyl)benzene (2TBB) molecules as the cross-linking agent, and the cross-linking is subsequently driven by Joule heating. Cross-linking with 2TBB increases the conductivity of the CNT fibers by a factor of similar to 100 and increases the tensile strength on average by 47%; in contrast, the tensile strength of CNT fibers fabricated without 2TBB decreases after the same Joule heating process. Symmetrical supercapacitors made from the 2TBB-treated CNT fibers exhibit a remarkably high volumetric energy density of similar to 4.5 mWh cm(-3) and a power density of similar to 1.3 W cm(-3).