Nano Research

, Volume 6, Issue 1, pp 65–76 | Cite as

One-step strategy to graphene/Ni(OH)2 composite hydrogels as advanced three-dimensional supercapacitor electrode materials

  • Yuxi Xu
  • Xiaoqing Huang
  • Zhaoyang Lin
  • Xing Zhong
  • Yu Huang
  • Xiangfeng Duan
Research Article

Abstract

Graphene-based three-dimensional (3D) macroscopic materials have recently attracted increasing interest by virtue of their exciting potential in electrochemical energy conversion and storage. Here we report a facile one-step strategy to prepare mechanically strong and electrically conductive graphene/Ni(OH)2 composite hydrogels with an interconnected porous network. The composite hydrogels were directly used as 3D supercapacitor electrode materials without adding any other binder or conductive additives. An optimized composite hydrogel containing ∼82 wt.% Ni(OH)2 exhibited a specific capacitance of ∼1,247 F/g at a scan rate of 5 mV/s and ∼785 F/g at 40 mV/s (∼63% capacitance retention) with excellent cycling stability. The capacity of the 3D hydrogels greatly surpasses that of a physical mixture of graphene sheets and Ni(OH)2 nanoplates (∼309 F/g at 40 mV/s). The same strategy was also applied to fabricate graphene-carbon nanotube/Ni(OH)2 ternary composite hydrogels with further improved specific capacitances (∼1,352 F/g at 5 mV/s) and rate capability (∼66% capacitance retention at 40 mV/s). Both composite hydrogels obtained here can deliver high energy densities (∼43 and ∼47 Wh/kg, respectively) and power densities (∼8 and ∼9 kW/kg, respectively), making them attractive electrode materials for supercapacitor applications. This study opens a new pathway to the design and fabrication of functional 3D graphene composite materials, and can significantly impact broad areas including energy storage and beyond.

Keywords

graphene Ni(OH)2 hydrogel three-dimensional supercapacitor energy storage 

Supplementary material

12274_2012_284_MOESM1_ESM.pdf (710 kb)
Supplementary material, approximately 707 KB.

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Yuxi Xu
    • 1
  • Xiaoqing Huang
    • 2
  • Zhaoyang Lin
    • 1
  • Xing Zhong
    • 1
  • Yu Huang
    • 2
    • 3
  • Xiangfeng Duan
    • 1
    • 3
  1. 1.Department of Chemistry and BiochemistryUniversity of CaliforniaLos AngelesUSA
  2. 2.Department of Materials Science and EngineeringUniversity of CaliforniaLos AngelesUSA
  3. 3.California Nanosystems InstituteUniversity of CaliforniaLos AngelesUSA

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