Morphology controlled high performance supercapacitor behaviour of the Ni-Co binary hydroxide system

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• 作者：Xiang Sun ; Gongkai Wang ; Hongtao Sun ; Fengyuan Lu ; Mingpeng Yu ; Jie Lian ; ^{lianj@rpi.edu}
• 关键词：Supercapacitor ; Nickel hydroxide ; Cobalt hydroxide ; Nanostructure ; Electrochemistry
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：238
• 期：Complete
• 页码：150-156
• 全文大小：1789 K

文摘

The morphology evolution of the Ni-Co binary hydroxides was studied varying from nanosheets, to nanoplate-nanospheres, to nanorods and to a nanoparticle geometry by simply controlling the Co:Ni ratio in the initial reactant. High capacitances of 1030?F?g^?1 and 804?F?g^?1 can be achieved in the 1-D nanorod morphology at mass loading of 1?mg?cm^?2 and 2.8?mg?cm^?2 at a current density of 3?A?g^?1, respectively. To demonstrate its practical application, the binary hydroxide electrode was coupled with chemically-reduced graphene (CG) forming an asymmetric supercapacitor in order to improve the potential window and thus energy density. The asymmetric supercapacitor delivers a high energy density of 26.3?Wh?kg^?1 at the power density of 320?W?kg^?1. The approach of controlling morphology and crystallinity of the binary system for optimizing supercapacitive performance may be applied developing other promising multiply metal hydroxide/oxide systems for supercapacitor applications.