材料科学
超级电容器
镍
氢氧化物
钴
假电容器
石墨烯
氧化钴
电极
溴化物
氧化物
化学工程
钴萃取技术
纳米结构
电容
层状双氢氧化物
无机化学
纳米技术
冶金
化学
物理化学
工程类
作者
Hao Chen,Linfeng Hu,Min Chen,Yan Yan,Limin Wu
标识
DOI:10.1002/adfm.201301747
摘要
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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