Radially Aligned Porous Carbon Nanotube Arrays on Carbon Fibers: A Hierarchical 3D Carbon Nanostructure for High‐Performance Capacitive Energy Storage
Radially Aligned Porous Carbon Nanotube Arrays on Carbon Fibers: A Hierarchical 3D Carbon Nanostructure for High‐Performance Capacitive Energy Storage
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DOI：
10.1002/adfm.201505226
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发表时间：
2016-05
影响因子：
19
通讯作者：
Guanhua Zhang;Yian Song;Hang Zhang;Jia Xu;H. Duan;J. Liu
中科院分区：
文献类型：
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作者：
Guanhua Zhang;Yian Song;Hang Zhang;Jia Xu;H. Duan;J. Liu
提出了一种在柔性碳纤维（CF）上制备多级排列多孔碳纳米管阵列（PCNTAs）的新方法。PCNTA是通过乙醇在ZnO纳米棒阵列上的催化转化，然后ZnO纳米棒的还原蒸发而获得的，从而导致最终PCNTA的均匀且可控的壁厚。通过调整ZnO纳米棒阵列的合成方案，可以调节PCNTAs的三维排列、直径和长度。PCNTAs@ CF在6 m KOH中表现出40 A g−1时182 F g−1的高比电容（20 A g− 1时188 F g− 1）。该对称超级电容器显示出优异的循环稳定性，在12 A g−1的电流密度下连续循环10 000次后，每次循环仅损失0.0016%。这些优异的电化学性能归因于分层PCNTAs的独特结构设计，其不仅提供了用于增强电子和离子传输的适当通道，而且还增加了用于访问更多电解质离子的表面积。结构设计和合成方法是通用的，可以扩展到合成广泛的材料系统。
A novel and scalable synthesis approach to produce hierarchically aligned porous carbon nanotube arrays (PCNTAs) on flexible carbon fibers (CFs) is developed. The PCNTAs are obtained by catalytic conversion of ethanol on ZnO nanorod arrays and then reduction‐evaporation of ZnO nanorods, resulting in uniform and controllable wall thicknesses of the final PCNTAs. The 3D arrangement, the diameters, and the lengths of the PCNTAs can be tuned by adjusting the synthesis protocols of the ZnO nanorod arrays. The PCNTAs@CFs exhibit a high specific capacitance of 182 F g−1 at 40 A g−1 (188 F g−1 at 20 A g−1) in 6 m KOH. The symmetric supercapacitor shows an excellent cycling stability with only 0.0016% loss per cycle after 10 000 continuous cycles at the current density of 12 A g−1. These excellent electrochemical performances are ascribed to the unique structural design of hierarchical PCNTAs, which provide not only appropriate channels for enhanced electronic and ionic transport but also increased surface area for accessing more electrolyte ions. The structural design and the synthesis approach are general and can be extended to synthesizing a broad range of materials systems.