期刊
ADVANCED FUNCTIONAL MATERIALS
卷 24, 期 7, 页码 934-942出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201301747
关键词
nickel-cobalt; hydroxides; nanosheets; electrodes; reduced graphene oxide; hydrothermal processes; supercapacitors
类别
资金
- National Natural Science Foundation of China [51133001, 21074023, 21374018, 51372040]
- National 863 Foundation
- Doctorate Foundation of Ministry of Education of China [20110071130002]
- Science and Technology Foundation of Shanghai [12nm0503600, 13JC1407800, 12PJ1400300]
- Innovation Program of Shanghai Municipal Education Commission [14ZZ003]
A facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants. As pseudocapacitors, the as-obtained Ni-Co LDH hybrid film-based electrodes display a significantly enhanced specific capacitance (2682 F g(-1) at 3 A g(-1), based on active materials) and energy density (77.3 Wh kg(-1) at 623 W kg(-1)), compared to most previously reported electrodes based on nickel-cobalt oxides/hydroxides. Moreover, the asymmetric supercapacitor, with the Ni-Co LDH hybrid film as the positive electrode material and porous freeze-dried reduced graphene oxide (RGO) as the negative electrode material, exhibits an ultrahigh energy density (188 Wh kg(-1)) at an average power density of 1499 W kg(-1) based on the mass of active material, which greatly exceeds the energy densities of most previously reported nickel or cobalt oxide/hydroxide-based asymmetric supercapacitors.
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