Enhanced laser scribed flexible graphene-based micro-supercapacitor performance with reduction of carbon nanotubes diameter
Enhanced laser scribed flexible graphene-based micro-supercapacitor performance with reduction of carbon nanotubes diameter
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通过减小碳纳米管直径增强激光划线柔性石墨烯基微型超级电容器性能
DOI：
10.1016/j.carbon.2014.03.058
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发表时间：
2014-08-01
期刊：
影响因子：
10.9
通讯作者：
Liu, Zhongyuan
中科院分区：
文献类型：
--
作者：
Wen, Fusheng;Hao, Chunxue;Liu, Zhongyuan
通过利用氧化石墨（GO）诱导转变为激光划线石墨烯（LSG），柔性聚对苯二甲酸乙二醇酯片上的GO/碳纳米管（CNT）混合粉末涂层被图案化为LSG/CNTs微型超级电容器（LSG/CNTs-MSC）。在存在直径较小的 CNT 的情况下，激光划线的 LSG/CNTs-MSC 被发现能产生更好的能量存储性能。这种对 CNT 直径的依赖性可归因于 CNT 在防止 LSG 层重新堆叠方面的作用，从而增加了离子可及的表面积。直径较小的碳纳米管更容易插入到LSG层之间，从而更有效地抑制再沉积现象。采用直径1~2 nm的单壁碳纳米管(SWCNT),激光刻划的LSG/SWCNTs-MSC表现出最佳的电化学性能:电流密度1000 mA cm(-3)时体积电容为3.10 F cm(-3),体积能量密度为0.84 mW h cm(-3),功率密度为1.0W cm(-3),且具有长期循环稳定性。 (C) 2014 Elsevier Ltd. 保留所有权利。
By making use of the induced transformation of graphite oxide (GO) to laser scribed graphene (LSG), the coated layers of GO/carbon nanotubes (CNTs) hybrid powders on flexible polyethylene terephthalate sheets were patterned into LSG/CNTs micro-supercapacitors (LSG/CNTs-MSCs). In the presence of CNTs with a smaller diameter, the laser-scribed LSG/CNTs-MSC was found to yield the better energy storage performance. This dependence on the CNT diameter can be attributed to the role of CNTs in prevention of restacking of LSG layers and thus the increase of ion-accessible surface area. The CNTs with a smaller diameter can be more easily inserted between the LSG layers, thus inhibiting the restacldng phenomenon more effectively. By using the single-wall CNTs (SWCNTs) of 1-2 nm diameter, the laser-scribed LSG/SWCNTs-MSC was observed to exhibit the best electrochemical properties: The volumetric capacitance of 3.10 F cm(-3) at a current density of 1000 mA cm(-3), the volumetric energy density of 0.84 mW h cm(-3) and power density of 1.0W cm(-3), and long-term cycling stability. (C) 2014 Elsevier Ltd. All rights reserved.