High-performance asymmetric supercapacitor based on Ni3S2 nanoparticles immobilized on carbon nanosheets from sodium alginate

In this academic research, we report a facile carbonization approach to fabricate Ni3S2 nanoparticles immobilized on interconnected carbon nanosheets (denoted as Ni/Ni3S2@CNS) derived from sodium alginate. The prepared hybrids provide more redox sites and shorten ion diffusion path. On the one hand, the interconnected carbon nanosheets restrain the agglomeration and dissolution of nanoparticles under the high carbonization temperature. On the other hand, it effectively improves the electrical conductivity, thus maintaining its excellent electrochemical properties. Consequently, the Ni/Ni3S2@CNS-2-800 electrode fulfills perfect specific capacity, satisfactory charge-discharge rate, and splendid lifespan. Furthermore, an advanced asymmetrical device is assembled by employing Ni/Ni3S2@CNS-2-800 and activated carbon as the electrode materials, which delivers a high specific capacitance (229.30 F g(-1)) and exceptional energy density (81.42 W h kg(-1)). (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study reports a facile carbonization approach to fabricate Ni/Ni3S2@CNS material with excellent electrochemical performance, including more redox sites and shorter ion diffusion pathways. The prepared electrode material exhibits good specific capacity, charge-discharge rate, and lifespan; an advanced asymmetrical device assembled using this material delivers high specific capacitance and exceptional energy density.