One-step preparation of Ni3S4 quantum dots composite graphene/carbon nanotube conductive network for asymmetric supercapacitor

In this reported work, Ni3S4 quantum dots (QDs) composite graphene/carbon nanotube (G/CNTs) composites were prepared using a one-step method. Among them, graphene is produced by carbon nanotubes and Ni catalyst. G/CNTs can not only prevent the agglomeration of Ni(3)S(4 )QDs, but also preclude this insulating drawback caused by the interface of QDs. XPS analysis data showed that after adding G/CNTs to Ni(3)S(4 )QDs, the electron interaction was stronger, which promotes the electron transport in the material. The electrochemical test results of the electrode material showed that G/CI\ITs increased the specific capacitance of the Ni(3)S(4 )QDs by 4.5 times and its rate capability from 22% to 82%. The energy density of asymmetric supercapacitor assembled with electrodes containing the Ni3S4 QDs@G/CNTs and activated carbon achieved 50 Wh kg(-1). This work provides a reasonable way for improving the electrochemical performance of supercapacitor electrode materials. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

In this study, Ni3S4 quantum dots composite graphene/carbon nanotube composites were prepared using a one-step method. The addition of G/CNTs improved electron transport and enhanced the electrochemical performance of the electrode material significantly, increasing specific capacitance and rate capability. The asymmetric supercapacitor assembled with Ni3S4 QDs@G/CNTs electrodes achieved an energy density of 50 Wh kg(-1), showing great potential for improving the electrochemical performance of supercapacitor electrode materials.