Splitting of a vertical multiwalled carbon nanotube carpet to a graphene nanoribbon carpet and its use in supercapacitors.
Splitting of a vertical multiwalled carbon nanotube carpet to a graphene nanoribbon carpet and its use in supercapacitors.
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DOI：
10.1021/nn400750n
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发表时间：
2013-05
期刊：
影响因子：
17.1
通讯作者：
Chenguang Zhang;Zhiwei Peng;Jian Lin;Yu Zhu;G. Ruan;Chih-Chau Hwang;W. Lu;R. Hauge;J. Tour-J.-To
中科院分区：
文献类型：
--
作者：
Chenguang Zhang;Zhiwei Peng;Jian Lin;Yu Zhu;G. Ruan;Chih-Chau Hwang;W. Lu;R. Hauge;J. Tour-J.-To
采用钾蒸气对垂直排列的多壁碳纳米管毯（VA-CNTs）进行了纵向裂解。所得结构具有部分分裂的MWCNT和石墨烯纳米带（GNR）的地毯。利用扫描电子显微镜、透射电子显微镜、原子力显微镜、拉曼光谱和X射线光电子能谱对分裂结构进行了表征。当与原始VA-CNT毯相比时，分裂的VA-CNT毯具有增强的电化学性能，在超级电容器中具有更好的比电容。此外，分裂的VA-CNT毯状物作为超级电容器电极材料具有优异的循环性。在5.2 Wh/kg的能量密度和9.4 Wh/kg的最大能量密度下，测得的最大功率密度为103 kW/kg。分裂的VA-碳纳米管的上级电化学性能可归因于分裂后离子可及性的表面积增加，以及基于保留的GNR排列的垂直导电路径的结构的持久导电性。
Potassium vapor was used to longitudinally split vertically aligned multiwalled carbon nanotubes carpets (VA-CNTs). The resulting structures have a carpet of partially split MWCNTs and graphene nanoribbons (GNRs). The split structures were characterized by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. When compared to the original VA-CNTs carpet, the split VA-CNTs carpet has enhanced electrochemical performance with better specific capacitance in a supercapacitor. Furthermore, the split VA-CNTs carpet has excellent cyclability as a supercapacitor electrode material. There is a measured maximum power density of 103 kW/kg at an energy density of 5.2 Wh/kg and a maximum energy density of 9.4 Wh/kg. The superior electrochemical performances of the split VA-CNTs can be attributed to the increased surface area for ion accessibility after splitting, and the lasting conductivity of the structure with their vertical conductive paths based on the preserved GNR alignment.