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

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• 作者：Mingyang Yang ; Hua Cheng ; Yingying Gu ; Zhifang Sun ; Jing Hu ; Lujie Cao…
• 关键词：electrodeposition ; concentration ; gradient ; nickel cobalt hydroxides ; supercapacitors
• 刊名：Nano Research
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：8
• 期：8
• 页码：2744-2754
• 全文大小：2,534 KB
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• 作者单位：Mingyang Yang (1) (2)
  Hua Cheng (1)
  Yingying Gu (2)
  Zhifang Sun (1)
  Jing Hu (1)
  Lujie Cao (1)
  Fucong Lv (1)
  Minchan Li (1) (2)
  Wenxi Wang (1)
  Zhenyu Wang (1) (2)
  Shaofei Wu (1)
  Hongtao Liu (2)
  Zhouguang Lu (1)
  
  1. Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055, China
  2. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

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 three-electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1,760 F·g? 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?. 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? at a power density of 3.0 kW·kg?, and excellent rate capability—energy densities of about 70.4 and 26.0 Wh·kg? were achieved when the average power densities were increased to 26.2 and 133.4 kW·kg?, 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? was achieved, which compares very well with the traditional doublelayer supercapacitors.