Nickel Cobalt Hydroxide @Reduced Graphene Oxide Hybrid Nanolayers for High Performance Asymmetric Supercapacitors with Remarkable Cycling Stability

Hongnan Ma, Jing He, Ding Bang Xiong, Jinsong Wu, Qianqian Li, Vinayak Dravid, Yufeng Zhao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

253 Scopus citations

Abstract

Nanolayered structures present significantly enhanced electrochemical performance by facilitating the surface-dependent electrochemical reaction processes for supercapacitors, which, however, causes capacitance fade upon cycling due to their poor chemical stability. In this work, we report a simple and effective approach to develop a stable, high performance electrode material by integrating 2D transition metal hydroxide and reduced graphene oxide sheets at nanometer scale. Specifically, a hybrid nanolayer of Ni-Co hydroxide @reduced graphene oxide (Ni,Co-OH/rGO) with an average thickness of 1.37 nm is synthesized through an easy one-pot hydrothermal method. Benefiting from the face to face contact model between Ni-Co hydroxide and rGO sheets, such unique structure presents superior specific capacitance and cycling performance as compared to the pure Ni-Co hydroxide nanolayers. An asymmetric supercapacitor based on Ni,Co-OH/rGO and three-dimensional (3D) hierarchical porous carbon is developed, exhibiting a high energy density of 56.1 Wh kg-1 along with remarkable cycling stability (80% retention after 17 000 cycles), which holds great promise for practical applications in energy storage devices.

Original languageEnglish (US)
Pages (from-to)1992-2000
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number3
DOIs
StatePublished - Jan 27 2016

Keywords

  • Ni-Co hydroxide
  • cycling stability
  • nanolayer
  • supercapacitor
  • ultrathin

ASJC Scopus subject areas

  • Materials Science(all)

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