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首页> 外文期刊>Nanotechnology >Moving towards high-power, high-frequency and low-resistance CNT supercapacitors by tuning the CNT length, axial deformation and contact resistance
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Moving towards high-power, high-frequency and low-resistance CNT supercapacitors by tuning the CNT length, axial deformation and contact resistance

机译：通过调整CNT的长度，轴向变形和接触电阻，转向大功率，高频和低电阻的CNT超级电容器

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In this paper it is shown that the electrochemical behaviour of vertically aligned multi-walled carbon nanotube (VANT) supercapacitors is influenced by the VANTs length (electrode thickness), by their axial compression and by their interface with the current collector. It is found that the VANTs, which can be interpreted as a dense array of nanochannels, have an active area available to ions that is strongly affected by the electrodes thickness and compressional state. Consequently, the tested thinner electrodes, compressed electrodes or a combination of the two were found to be characterized by a significant improvement in terms of power density (up to 1246%), knee frequency (58822% working up to 10kHz), equivalent series resistance (ESR, up to 67%) and capacitance (up to 21%) when compared with thicker and/or uncompressed electrodes. These values are significantly higher than those reported in the literature where long VANTs with no control on compression are typically used. It is also shown that the ESR can be reduced not only by using shorter and compressed VANTs that have a higher conductance or by improving the electrode/collector electrical contact by changing the contact morphology at the nanoscale through compression, but also by depositing a thin platinum layer on the VANT tips in contact with the current collector (73% ESR decrease).
机译：本文显示垂直排列的多壁碳纳米管（VANT）超级电容器的电化学行为受VANTs长度（电极厚度），轴向压缩以及与集电器的界面影响。发现可以解释为密集的纳米通道阵列的VANT具有可用于离子的有效区域，该区域受电极厚度和压缩状态的强烈影响。因此，发现测试的较薄电极，压缩电极或两者的组合在功率密度（高达1246％），拐点频率（58822％高达10kHz），等效串联电阻方面有显着改善。与较厚和/或未压缩的电极相比（ESR，高达67％）和电容（高达21％）。这些值显着高于文献中所报道的值，在文献中通常使用无法控制压缩的长VANT。还表明，不仅可以通过使用具有较高电导率的较短且压缩的VANT来降低ESR，还可以通过通过压缩改变纳米级的接触形态来改善电极/集电极的电接触来降低ESR，还可以沉积薄的铂与集电器接触的VANT吸头上的涂层（ESR降低了73％）。

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