Hierarchical NiAl layered double hydroxide/multiwalled carbon nanotube/nickel foam electrodes with excellent pseudocapacitive properties.
Hierarchical NiAl layered double hydroxide/multiwalled carbon nanotube/nickel foam electrodes with excellent pseudocapacitive properties.
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DOI：
10.1021/am504530e
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发表时间：
2014-09
影响因子：
9.5
通讯作者：
Bo Wang;Gareth R. Williams;Z. Chang;Meihong Jiang;Junfeng Liu;Xiaodong Lei;Xiaoming Sun
中科院分区：
文献类型：
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作者：
Bo Wang;Gareth R. Williams;Z. Chang;Meihong Jiang;Junfeng Liu;Xiaodong Lei;Xiaoming Sun
赝电容器的性能通常在很大程度上取决于它们的分层结构和组成。在此，我们报道了一种三维分级NiAl层状双氢氧化物/多壁碳纳米管/镍泡沫（NiAl-LDH/MWCNT/NF）电极通过简单的三步制造方法制备：在Ni泡沫上原位水热生长NiAl-LDH膜，然后在NiAl-LDH膜上直接化学气相沉积生长致密MWCNT，最后在表面活性剂十二烷基硫酸钠的存在下通过原位水热法在MWCNTs表面生长NiAl-LDH。MWCNT表面完全被NiAl-LDH六方片晶覆盖，这种分层结构导致电容大大增强。NiAl-LDH/MWCNT/NF电极具有每cm（2）MWCNT/NF表面5.8mg LDH的面积负载质量。它还具有优异的面电容（7.5 F cm（-2））、比电容（1293 F g（-1））和循环稳定性（在1000次充放电循环后保持其初始值的83%）。因此，NiAl-LDH/MWCNT/NF材料是一种非常有前途的电极，在电化学储能中具有潜在的应用。
The performances of pseudocapacitors usually depend heavily on their hierarchical architectures and composition. Herein, we report a three-dimensional hierarchical NiAl layered double hydroxide/multiwalled carbon nanotube/nickel foam (NiAl-LDH/MWCNT/NF) electrode prepared by a facile three-step fabrication method: in situ hydrothermal growth of NiAl-LDH film on a Ni foam, followed by direct chemical vapor deposition growth of dense MWCNTs onto the NiAl-LDH film, and finally the growth of NiAl-LDH onto the surface of the MWCNTs via an in situ hydrothermal process in the presence of surfactant sodium dodecyl sulfate. The MWCNT surface was fully covered by NiAl-LDH hexagonal platelets, and this hierarchical architecture led to a much enhanced capacitance. The NiAl-LDH/MWCNT/NF electrode has an areal loading mass of 5.8 mg of LDH per cm(2) of MWCNT/NF surface. It also possesses exceptional areal capacitance (7.5 F cm(-2)), specific capacitance (1293 F g(-1)), and cycling stability (83% of its initial value was preserved after 1000 charge-discharge cycles). The NiAl-LDH/MWCNT/NF material is thus a highly promising electrode with potential applications in electrochemical energy storage.