An asymmetric supercapacitor based on NiCo2O4 nanosheets as anode and partially reduced graphene oxides/carbon nanotubes as cathode
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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.
KeywordsNiCo2O4 nanosheets PRGO/CNTs Specific capacitance Supercapacitor
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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