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Agglomerated nickel–cobalt layered double hydroxide nanosheets on reduced graphene oxide clusters as efficient asymmetric supercapacitor electrodes

Published online by Cambridge University Press:  21 February 2020

Lu Liu
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Anru Liu
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Yuhan Xu
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Haoming Yu
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Fangqi Yang
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Jun Wang*
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Zheling Zeng
Affiliation:
School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, People's Republic of China
Shuguang Deng*
Affiliation:
School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, USA
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

Recently, layered double hydroxides (LDHs) have attracted intensive research interest as the next-generation supercapacitor electrodes due to their unique two-dimensional (2D) hydrotalcite-like structure. However, the inevitable agglomeration significantly decreases the accessible surface areas and blocks the pseudocapacitive sites, thus severely hinders their electrochemical applications. Herein, we develop a facile one-step growth approach to fabricate porous agglomerate of NiCo-LDH nanosheets and reduced graphene oxide (rGO) nanoflakes. By adjusting feeding molar ratios, the obtained NiCo-LDH/rGO electrode delivers a high specific capacity of 879.5 C/g at a current density of 0.5 A/g and still remains 485 C/g at 20 A/g. Furthermore, the fabricated asymmetric supercapacitor (ASC) has demonstrated a superior energy density of 48.7 W h/kg at a power density of 401 W/kg. After 2000 cycles, the assembled ASC exhibits an improved capacity retention of 81% within a potential window of 1.6 V at 2 A/g.

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Article
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Copyright © Materials Research Society 2020

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