Amorphous Ni鈥揅o Binary Oxide with Hierarchical Porous Structure for Electrochemical Capacitors

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• 作者：Chao Long ; Mingtao Zheng ; Yong Xiao ; Bingfu Lei ; Hanwu Dong ; Haoran Zhang ; Hang Hu ; Yingliang Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：7
• 期：44
• 页码：24419-24429
• 全文大小：857K
• ISSN：1944-8252

文摘

A simple and outstanding approach is provided to fabricate amorphous structure Ni鈥揅o binary oxide as supercapacitors electrode materials. We can easily obtain porous Ni鈥揅o oxides composite materials via chemical bath deposition and subsequent calcination without any template or complicate operation procedures. The amorphous porous Ni鈥揅o binary oxide exhibits brilliant electrochemical performance: first, the peculiar porous structure can effectively transport electrolytes and shorten the ion diffusion path; second, binary composition and amorphous character introduce more surface defects for redox reactions. It shows a high specific capacitance up to 1607 F g^鈥? and can be cycled for 2000 cycles with 91% capacitance retention. In addition, the asymmetric supercapacitor delivers superior energy density of 28 W h kg^鈥?, and the maximum power density of 3064 W kg^鈥? with a high energy density of 10 W h kg^鈥?.