title: Hierarchical NiAl layered double hydroxide/multiwalled carbon nanotube/nickel foam electrodes with excellent pseudocapacitive properties.
abstract: 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.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , P.O. Box 98, Beijing 100029, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Williams
authors.forename: Zheng
authors.initials: Z
authors.lastname: Chang
authors.forename: Meihong
authors.initials: M
authors.lastname: Jiang
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Lei
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Sun
keywords: layered double hydroxide; multiwalled carbon nanotube; nickel foam; pseudocapacitor