NiCo2S4/MoS2 Nanocomposites for Long-Life High-Performance Hybrid Supercapacitors

Abstract

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.

Recent progress in metal oxide-based electrode materials for safe and sustainable variants of supercapacitors

“…On the other hand, the MWI approach has limitations in terms of equipment availability, cost-effectiveness, and restricted large-scale manufacturing, but it is also an efficient way for producing MOs and composite electrode materials for SC applications, which yields a variety of multimodal morphology and crystal architectures of electrode materials. Additionally, the area of the surface and conduction of the materials, ion transport, durability of structures, and Faradaic responses of the metal oxide electrode materials also have a considerable impact on their electrochemical properties ( Tue et al, 2023 ).…”

Recent Advances in Molybdenum Disulfide and Its Nanocomposites for Energy Applications: Challenges and Development

“…Specifically, the electrode presented a capacity of 2594 F g −1 at a current density of 0.8 A g −1 after undergoing 45,000 charge and discharge cycles. Additionally, the hybrid supercapacitor device comprising NCMS-L and activated carbon achieved an energy density of 31.9 Wh kg −1 [ 187 ].…”

“… ( a ) Schematic representation of the synthesis process of NiCo 2 S 4 /MoS 2 composite (State I: shows the mixing of all precursors, State II: illustrates the formation of MoS 2 , State III: demonstrates the formation of NiCo 2 S 4 over MoS 2 with sheet- and rod-like morphologies), ( b ) Comparative CV curves of MoS 2 , NiCo 2 S 4 , and NCMS-L (NiCo 2 S 4 /MoS 2 composite with sheet-like morphology) at a scan rate of 100 mV s −1 , ( c ) Comparative GCD curves of MoS 2 , NiCo 2 S 4 , and NCMS-L at a current density of 1 mA g −1 , ( d ) CV curves of the hybrid supercapacitor device of NCMS-L and activated carbon at various scan rates, ( e ) GCD curves of the hybrid supercapacitor device of NCMS-L and activated carbon at various current densities. Adopted from [ 187 ]. Copyright 2023 Nanomaterials.…”