Dense and long carbon nanotube arrays decorated with Mn3O4 nanoparticles for electrodes of electrochemical supercapacitors
Dense and long carbon nanotube arrays decorated with Mn3O4 nanoparticles for electrodes of electrochemical supercapacitors
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DOI：
10.1016/j.carbon.2010.11.039
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发表时间：
2011-04-01
期刊：
影响因子：
10.9
通讯作者：
Chen, Weixing
中科院分区：
文献类型：
--
作者：
Cui, Xinwei;Hu, Fengping;Chen, Weixing
采用浸渍铸造法从非水溶液中均匀地在高密度、毫米长的碳纳米管阵列(CNTA)中沉积了Mn3O4纳米颗粒。纳米Mn3O4修饰后，碳纳米管由疏水转变为亲水，其排列和完整性没有受到破坏。与CNTA电极相比，亲水性Mn3O4/CNTA复合电极具有更好的超级电容器性能。Mn3O4/CNTA复合电极的最大比电容为143F/g，极高的面积归一化电容(每几何面积的法拉第)为1.70F/cm(2)，而CNTA电极的比电容仅为1-2F/g。当归一化到沉积的纳米Mn3O4时，比电容估计高达292F/g。该方法有望制造高性能的面积受限电化学超级电容器，并为用活性材料修饰高密度CNTA提供了一条新的途径。(C)2010爱思唯尔有限公司。保留所有权利。
Mn3O4 nanoparticles have been homogenously deposited within highly dense, millimeter-long carbon nanotube array (CNTA) by dip-casting method from non-aqueous solutions. After modified with Mn3O4 nanoparticles, CNTAs have been changed from hydrophobic to hydrophilic without their alignment and integrity being destroyed. The hydrophilic Mn3O4/CNTA composite electrodes present improved performance for supercapacitors, compared with as-grown CNTA electrodes. The maximum specific capacitance of the Mn3O4/CNTA composite electrode was found to be 143 F/g, leading to an exceptionally high area-normalized capacitance (Faraday per geometric area of the electrode) of 1.70 F/cm(2), while the specific capacitance for as-grown CNTA electrode is only 1-2 F/g. When normalized to the deposited Mn3O4 nanoparticles, the specific capacitance was estimated to be as high as 292 F/g. The method is promising for producing high performance area-limited electrochemical supercapacitors and provides a new route of decorating highly dense CNTAs with active materials. (C) 2010 Elsevier Ltd. All rights reserved.