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

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文摘 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 threeelectrode 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.
来源 Nano Research ,2015,8(8):2744-2754 【核心库】
DOI 10.1007/s12274-015-0781-3
关键词 electrodeposition ; concentration-gradient ; nickel cobalt hydroxides ; supercapacitors
地址

1. Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055  

2. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083

语种 英文
文献类型 研究性论文
ISSN 1998-0124
学科 物理学
基金 国家自然科学基金 ;  the Shenzhen Peacock Plan ;  the Starting-Up Funds of South University of Science and Technology of China (SUSTC) ;  the support from a Key Project of the Hunan Provincial Science and Technology Plan
文献收藏号 CSCD:5557566

参考文献 共 31 共2页

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引证文献 7 篇

1 Wei Guijuan Carbon quantum dot-induced self-assembly of ultrathin Ni(OH)_2 nanosheets: A facile method for fabricating three-dimensional porous hierarchical composite micronanostructures with excellent supercapacitor performance Nano Research,2017,10(9):3005-3017
CSCD被引 4 次

2 Zang Xiaoxian Controllable synthesis of triangular Ni(HCO_3)_2 nanosheets for supercapacitor Nano Research,2016,9(5):1358-1365
CSCD被引 2 次

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