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Chemical Papers

, Volume 74, Issue 2, pp 591–599 | Cite as

An asymmetric supercapacitor based on NiCo2O4 nanosheets as anode and partially reduced graphene oxides/carbon nanotubes as cathode

  • Ke Yan
  • Juan Wu
  • Ying-Ying Wang
  • Ning-Ning Liu
  • Ji-Tao Li
  • Yong-Ping Gao
  • Zhi-Qiang HouEmail author
Original Paper
  • 14 Downloads

Abstract

Nickel–cobalt oxide has been given more attention to being used as the supercapacitor's electrode materials due to its two-dimensional layered structure, good electron conductivity, and excellent stability. In this work, NiCo2O4 nanosheets were successfully prepared by the simple solvothermal reaction and the thermal treatment process. Under the three-electrode system, it exhibits a maximum specific capacitance of 978 F/g at 1.5 A/g and good cycle stability. Meanwhile, a freestanding of partially reduced graphene oxides/carbon nanotubes (PRGO/CNTs) film was obtained by the vacuum filter and solvothermal methods, which can provide a wide potential window of − 1 ~ 0 V and a maximum specific capacitance of 236 F/g at 0.5 A/g. Finally, an asymmetric supercapacitor of PRGO/CNTs//NiCo2O4 was assembled, which exhibits good electrochemical performance, such as specific capacitance of 82 F/g at 0.5 A/g, energy density of 18.8 Wh/kg at 0.32 kW/kg, and 99.5% of capacitance retention after 5000 cycles at 5 A/g. This test results reveal that PRGO/CNTs//NiCo2O4 ASC has great potential for practical application in energy storage systems.

Keywords

NiCo2O4 nanosheets PRGO/CNTs Specific capacitance Supercapacitor 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (11604395), the Program for Science & Technology Innovation Talents in Universities of Henan Province (18HASTIT032), Innovation Fund of College of Chemistry and Chemical Engineering in Zhou Kou Normal University (HYDC201901, HYDC201904), High Level Personal Fund of Zhou Kou Normal University (ZKNUC2017043), Key Research Project of Henan Higher Education Institute (19A150045, 19A150052).

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringZhou Kou Normal UniversityHenanPeople’s Republic of China
  2. 2.College of Physics and Telecommunication EngineeringZhou Kou Normal UniversityHenanPeople’s Republic of China
  3. 3.College of Science and TechnologyXinyang CollegeXinyangPeople’s Republic of China

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