超级电容器
材料科学
层状双氢氧化物
纳米线
电极
电容
阳极
功率密度
镍
钴
电化学
化学工程
氧化锡
异质结
纳米技术
氧化钴
氧化物
光电子学
氢氧化物
冶金
化学
物理化学
功率(物理)
工程类
物理
量子力学
作者
Xu Wang,Afriyanti Sumboja,Meng-Fang Lin,Jian Yan,Pooi See Lee
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2012-10-29
卷期号:4 (22): 7266-7266
被引量:383
摘要
Conducting nanowires are of particular interest in energy-related research on devices such as supercapacitors, batteries, water splitting electrodes and solar cells. Their direct electrode/current collector contact and highly conductive 1D structure enable conducting nanowires to provide ultrafast charge transportation. In this paper, we report the facile synthesis of nickel cobalt layered double hydroxides (LDHs) on conducting Zn(2)SnO(4) (ZTO) and the application of this material to a supercapacitor. This study also presents the first report of an enhancement of the active faradic reaction sites (electroactive sites) resulting from the heterostructure. This novel material demonstrates outstanding electrochemical performance with a high specific capacitance of 1805 F g(-1) at 0.5 A g(-1), and an excellent rate performance of 1275 F g(-1) can be achieved at 100 A g(-1). Furthermore, an asymmetric supercapacitor was successfully fabricated using active carbon as a negative electrode. This asymmetric device exhibits a high energy density of 23.7 W h kg(-1) at a power density of 284.2 W kg(-1). Meanwhile, a high power density of 5817.2 W kg(-1) can be achieved at an energy density of 9.7 W h kg(-1). More importantly, this device exhibits long-term cycling stability, with 92.7% capacity retention after 5000 cycles.
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