Wang Bo, Williams Gareth R, Chang Zheng, Jiang Meihong, Liu Junfeng, Lei Xiaodong, Sun Xiaoming
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , P.O. Box 98, Beijing 100029, China.
ACS Appl Mater Interfaces. 2014 Sep 24;6(18):16304-11. doi: 10.1021/am504530e. Epub 2014 Sep 10.
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.
赝电容器的性能通常在很大程度上取决于其分级结构和组成。在此，我们报道了一种通过简便的三步制备方法制备的三维分级镍铝层状双氢氧化物/多壁碳纳米管/泡沫镍（NiAl-LDH/MWCNT/NF）电极：在泡沫镍上原位水热生长NiAl-LDH薄膜，随后在NiAl-LDH薄膜上直接化学气相沉积生长致密的MWCNTs，最后在表面活性剂十二烷基硫酸钠存在下通过原位水热过程在MWCNTs表面生长NiAl-LDH。MWCNT表面被NiAl-LDH六角形薄片完全覆盖，这种分级结构导致电容大大增强。NiAl-LDH/MWCNT/NF电极在MWCNT/NF表面的面负载质量为每平方厘米5.8毫克的LDH。它还具有出色的面积电容（7.5 F cm(-2)）、比电容（1293 F g(-1)）和循环稳定性（在1000次充放电循环后保留其初始值的83%）。因此，NiAl-LDH/MWCNT/NF材料是一种极具前景的电极，在电化学能量存储方面具有潜在应用。
