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Research Article

Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors

Mingyang Yang1,2, Hua Cheng1, Yingying Gu2, Zhifang Sun1, Jing Hu1, Lujie Cao1, Fucong Lv1, Minchan Li1,2, Wenxi Wang1, Zhenyu Wang1,2, Shaofei Wu1, Hongtao Liu2, Zhouguang Lu1()
Department of Materials Science and EngineeringSouth University of Science and Technology of ChinaShenzhen518055China
College of Chemistry and Chemical EngineeringCentral South UniversityChangsha410083China
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Abstract

Novel three-dimensional (3D) concentration-gradient Ni-Co hydroxide nanostructures (3DCGNC) have been directly grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder- and conductor-free electrode for supercapacitors. Based on a three-electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1, 760 F·g-1 and a remarkable rate capability whereby more than 62.5% capacitance was retained when the current density was raised from 1 to 100 A·g-1. More importantly, asymmetric supercapacitors were assembled by using the obtained 3DCGNC as the cathode and Ketjenblack as a conventional activated carbon anode. The fabricated asymmetric supercapacitors exhibited very promising electrochemical performances with an excellent combination of high energy density of 103.0 Wh·kg-1 at a power density of 3.0 kW·kg-1, and excellent rate capability—energy densities of about 70.4 and 26.0 Wh·kg-1 were achieved when the average power densities were increased to 26.2 and 133.4 kW·kg-1, respectively. Moreover, an extremely stable cycling life with only 2.7% capacitance loss after 20, 000 cycles at a current density of 5 A·g-1 was achieved, which compares very well with the traditional doublelayer supercapacitors.

Keywords

electrodepositionconcentration-gradientnickel cobalt hydroxidessupercapacitors

Electronic Supplementary Material

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Nano Research
Volume 8 Issue 8,
August 2015
Pages 2744-2754
DOI: 10.1007/s12274-015-0781-3
Cite this article:
Yang M, Cheng H, Gu Y, et al. Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors. Nano Research, 2015, 8(8): 2744-2754. https://doi.org/10.1007/s12274-015-0781-3
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