Frontiers of Materials Science

, Volume 12, Issue 3, pp 273–282 | Cite as

A two-step approach to synthesis of Co(OH)2/γ-NiOOH/reduced graphene oxide nanocomposite for high performance supercapacitors

  • Ke ZhanEmail author
  • Tong Yin
  • Yuan Xue
  • Yinwen Tan
  • Yihao Zhou
  • Ya Yan
  • Bin ZhaoEmail author
Research Article


A two-step approach was reported to fabricate cobaltous hydroxide/γ- nickel oxide hydroxide/reduced graphene oxide (Co(OH)2/γ-NiOOH/RGO) nanocomposites on nickel foam by combining the reduction of graphene oxide with the help of reflux condensation and the subsequent hydrothermal of Co(OH)2 on RGO. The microstructural, surface morphology and electrochemical properties of the Co(OH)2/γ-NiOOH/RGO nanocomposite were investigated. The results showed that the surface of the first-step fabricated γ-NiOOH/RGO nanocomposites was uniformly coated by Co(OH)2 nanoflakes with lateral size of tens of nm and thickness of several nm. Co(OH)2/γ-NiOOH/RGO nanocomposite demonstrated a high specific capacitance (745 mF/cm2 at 0.5 mA/cm2) and a cycling stability of 69.8% after 1000 cycles at 30 mV/cm2. γ-NiOOH/RGO//Co(OH)2/γ-NiOOH/RGO asymmetric supercapacitor was assembled, and maximum gravimetric energy density of 57.3 W∙h/kg and power density of 66.1 kW/kg were achieved. The synergistic effect between the highly conductive graphene and the nanoflake Co(OH)2 structure was responsible for the high electrochemical performance of the hybrid electrode. It is expected that this research could offer a simple method to prepare graphene-based electrode materials.


reflux condensation graphene cobaltous hydroxide supercapacitor 


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This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51605293 and 51702213) and the Natural Science Foundation of Shanghai (16ZR1423500). The authors also acknowledge financial support from the Program for Associate Professor of Special Appointment (Young Eastern Scholar) at Shanghai Institutions of Higher Learning (QD2016013).

Supplementary material

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Supplementary information


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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghaiChina
  2. 2.Shanghai Innovation Institute for MaterialsShanghaiChina

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