TY - JOUR
T1 - Morphology controlled high performance supercapacitor behaviour of the Ni-Co binary hydroxide system
AU - Sun, Xiang
AU - Wang, Gongkai
AU - Sun, Hongtao
AU - Lu, Fengyuan
AU - Yu, Mingpeng
AU - Lian, Jie
N1 - Funding Information:
This work was financially supported by a NSF Career Award under the Award of DMR 1151028.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jpowsour.2013.03.069
DO - 10.1016/j.jpowsour.2013.03.069
M3 - Article
AN - SCOPUS:84876278341
SN - 0378-7753
VL - 238
SP - 150
EP - 156
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -