Nanomaterials (Feb 2023)

NiCo<sub>2</sub>S<sub>4</sub>/MoS<sub>2</sub> Nanocomposites for Long-Life High-Performance Hybrid Supercapacitors

  • Le Nhu Minh Tue,
  • Sumanta Sahoo,
  • Ganesh Dhakal,
  • Van Hoa Nguyen,
  • Jintae Lee,
  • Yong Rok Lee,
  • Jae-Jin Shim

DOI
https://doi.org/10.3390/nano13040689
Journal volume & issue
Vol. 13, no. 4
p. 689

Abstract

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Metal sulfides (MS) and mixed metal sulfides (MTMS) have been considered potential candidates over their metal oxide/mixed metal oxide counterparts in recent years. Herein, one MTMS, i.e., NiCo2S4, was combined with 2D MS MoS2 through a single-step solvothermal process with different morphologies (sheet-like and rod-like) for supercapacitor applications. The resulting electrode exhibited excellent coulombic efficiency, high specific capacitance, superior energy density, and, most importantly, ultra-high cycling stability. In particular, the electrode delivered a capacitance of 2594 F g−1 at 0.8 A g−1 after 45,000 charge/discharge cycles with a remarkable stability of 192%. Moreover, the corresponding hybrid supercapacitor device displayed an impressive coulombic efficiency of 123% after 20,000 cycles and 118% after 45,000 cycles. In addition, the device also exhibited a decent energy density of 31.9 Wh kg−1 and good cycling stability of 102% over 15,000 cycles.

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